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Mark2910 |
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Mark2910 Derestricted Danger
Joined: 16 Jun 2012 Karma :
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Posted: 16:08 - 23 Jun 2012 Post subject: How to up the speed on my 125?? |
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Hey guys,
I know my little 2007 Keeway Speed 125 is a crappy cheap chinese hunk O'Junk compared to the Yamaha's, Aprilla and Honda 125's but I've been reading up and watching some clips on Youtube about 125's doing 80mph.. i know mine will never achieve such a dizzy height of 80 as i 6ft 2 and the best part of 18 st.
Mine tops out at 57mph (downhill) on the speedo, I've read changing the front sprocket etc, Air filter etc but my mechanical Knowledge is limited and I don't want a major job of engine out cos frankly is isn't that important as i will get around to doing my bike test and getting a "bigger" bike but i would like a little more knowledge of tinkering with bikes before i do the test.
I've checked and its a 15 tooth front sprocket, looks standard rear, No idea how the Carb is set up either or how to adjust it...
Cheers
Mark |
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arena |
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arena Two Stroke Sniffer
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numpty2 |
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numpty2 Trackday Trickster
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MarJay |
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MarJay But it's British!
Joined: 15 Sep 2003 Karma :
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Posted: 19:17 - 23 Jun 2012 Post subject: |
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hahahahahahahahahahahaahahahahahahahahaahh.
No. ____________________ British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another. |
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Derivative |
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Derivative World Chat Champion
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Pete. |
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Pete. Super Spammer
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symonh2000 |
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symonh2000 Crazy Courier
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Mark2910 |
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Mark2910 Derestricted Danger
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Mark2910 |
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Mark2910 Derestricted Danger
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numpty2 |
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numpty2 Trackday Trickster
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MarJay |
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MarJay But it's British!
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Lord Deckard |
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Lord Deckard Derestricted Danger
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_Iain_ |
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_Iain_ Banned
Joined: 01 Feb 2012 Karma :
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Posted: 01:21 - 24 Jun 2012 Post subject: |
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Fresh oil, fresh air filter, fresh fuel filter, new spark plug. Gap the plug to whatever its sposed to be set at, get the valve clearances done too while you've got the feeler gauges out. Clean the chain, clean it realy realy well, lube it well with some decent lube and set the tension just right. Set the tyres to the correct pressures. I posted up guides on how to do all this stuff somewhere in pictures. Its not major mechanics, its basic damn servicing and a neglected engine wont do shit when you push it past the limits.
Make sure its got less than 1/4 tank of petrol in it, and find a very very long downhill stretch of motorway/dual carridgeway. It'll take a mile or two to get up to speed, and then the same again to push it the final 10mph or so...Get your chin on the petrol tank, elbows right in, toes in as close to the bike as you can get em.
Dont adjust the carb, you'll fuck it up. Dont go near it with a screwdriver, hell dont even LOOK at it as you'll do more harm then good.
Sprockets wise, go one tooth smaller if you must, but honestly it doesnt make all that much difference. Been there, done that.
Indicated 80mph on a YBR125, 11,000 revs and sounded like absolute fucking death. I wouldnt advise holding it near, or past the redline for very long at all else it'll go bang. I found you had to hold 3rd and 4th gear to smack on the 10,000 rev mark before upshifting else it just wouldnt pull itself that last little bit.
Think 90% of it is finding a decent enough stretch. Down a normal hill the YBR will maybe do 65 or so. Its gotta be steep, smooth and straight.
Question answered? ____________________ Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340 |
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Teflon-Mike |
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Teflon-Mike tl;dr
Joined: 01 Jun 2010 Karma :
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Posted: 02:05 - 24 Jun 2012 Post subject: |
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£24 for a 4l can will do 3 changes
_Iain_ wrote: | fresh air filter |
£10 will last as long as the oil
_Iain_ wrote: | fresh fuel filter |
Doubt it has one! Clean cause on pet-cock on soapy water... job jobbed
_Iain_ wrote: | new spark plug |
£4 will need another when the oil runs out
_Iain_ wrote: | . Gap the plug to whatever its sposed to be set at, get the valve clearances done too while you've got the feeler gauges out. |
£16 for Haynes Chinky Bike manual to get the numbers from.....
_Iain_ wrote: | Clean the chain, clean it realy realy well, lube it well with some decent lube and set the tension just right. |
£4 for oven cleaner from super-market
£10 for proper chain lube
_Iain_ wrote: | Set the tyres to the correct pressures. |
£5 for pretture guage you can rely on
£10 for a pump
Congratulations you have just spend £83 of the lads money, to help him achieve MAYBE 55mph..... and he could have bought another one for that!
_Iain_ wrote: | a neglected engine wont do shit when you push it past the limits. |
A Chinky motor wont do very much more even if its fettled by an ace!
I cant remember, Keeway, Skyjet & Superbyke; have a feeling that one of them hides a bloomin pit-bike engine behind its fancy plastic! Its not even as powerful as the CG copy motor versions.... loads 'tunable' and loads of tuning bits for them though..... same with teh CG engines... people get good results from them as well...
Bit like old VW Beetles... many a time have I heard folk claim that they have got 50% more power from them making 'simple' mods....
Yes, but 50% of fuck all is just a a bigger fuck-all, innit! Fact that they can get such big % gains is simply that they are so dire to begin with be hard to make them worse!
NO 125 is ever going to be 'fast'' even full-power not learner-legal two stroke sports.... not compared to big-bikes.
125 Four-Stroke? You are never going to get more than 'a bit brisk'.
CB125Twin, was THE most powerful 'standard' production 125 four-stroke ever built, I believe, 1977 and 17bhp..... did 80mph at a push!
I have had the de-tuned 'learner-legal' 125 Super-Dream 'off the clock', reading something well beyond 80, pointing about where 90 might be on the dial if it was marked..... genuine GPS reading of 70.
And I DOWN geared it to get that.......
Its about as 'quick' as you are ever going to get a 4-stroke Learner-Legal to go.
Jap brand Commuters, like the YBR, with only 10bhp to play with, in GOOD fettle will be lucky to nose past a genuine 65 very often....
The Chinky ones? Well if you can get a GENUINE 55 from them you are doing pretty good.....
As for tuning them?!?! Forget it!
Can be done, but as said, gains are TINY for the effort, and you are chuking money at something that aint worth bog all to make it even LESS valuable, and LESS reliable... which given these things notoriety for requiring attention, is rather like giving up and saying "Pah! Well I DONT expect you to work ANYWAY... so may as well see just how SPECTACULARLY you can break down on me....."
Wry humor? How to make a Chinky bike go faster?
Buy an AA Card.... It will do 56mph on the back of the recovery truck! ____________________ My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?' |
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luckatme85 |
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luckatme85 Borekit Bruiser
Joined: 11 Jun 2012 Karma :
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Posted: 12:23 - 24 Jun 2012 Post subject: bad idea!! |
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hi probably a bad idea but if you look on ebay you can buy big bore kits for these very cheap, i had one on my chinky it was ace made it shake and rattle even more than before and nuts and bolts needed checking more regular. i gained roughly 7mph top end with bigger carb and i kept standard airbox with a chopped exhuast with no baffles, sounded ace popping back but then when someone on a tuned 125 scooter wanted to race you it got very embarrasing. tbh though it felt like i was doing 90mph instead of the indicated 70mph, but that was only coz of the rattling and shaking. the scariest part was wandering if it would fall apart, very scary and tbh a waste of time and money, either buy a 2t 125 that will be much quicker for you or get your test done.
from experience i think keeway are one of the better made chinky bikes and they do get quite good money on ebay and gumtree and the likes so sell it and buy yaself a cheap 2t 125, just dont make the mistake i made with my ts125r, i cant get parts for it very easy so go for something you can get parts for easy, dtr have one of the most reliabe 2t engines around but expect to pay quite a lot for one, if ya get one for less than a grand you will be lucky, theres a few nsr, tzr, rg's about have a look |
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Alpha-9 |
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Alpha-9 Super Spammer
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nightshaddow |
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nightshaddow Nearly there...
Joined: 18 Feb 2008 Karma :
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Posted: 13:00 - 24 Jun 2012 Post subject: |
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these things can be upgraded to your benefit but the legality of some of the upgrades is questionable and the price is also the same
150cc bore kits are available and will give a little extra for around £60
30mm carbs fitted with 110 main jet and pod filter also helps £30
changing sprockets will help with acceleration or top speed
how much do you want to blow to get the results ____________________ "WHAT DO YOU MEAN 100 MPH THATS IMPOSSIBLE Its chinese OFFICER."
Current rides CB 125 TDE(the next project) NS125RK ( now on the road ) CB125TDC (soon to be project 17) melody ( the nephews ) |
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Knightsy |
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Knightsy World Chat Champion
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Alpha-9 |
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Alpha-9 Super Spammer
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stevo as b4 |
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stevo as b4 World Chat Champion
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nightshaddow |
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nightshaddow Nearly there...
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_Iain_ |
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_Iain_ Banned
Joined: 01 Feb 2012 Karma :
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Posted: 17:16 - 24 Jun 2012 Post subject: |
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Cost me £30 for the oil, sump plug washer, air filter and plug. Through a dealership known for rip off prices, using genuine yamaha parts.
Using the wonders of the internet i got the valve clearance figures for free.
£1 ish per litre for parrafin, and then another £1 tiny can of chain lube
20p on tescos forecourt to pump the tyres out. Who gives a toss if its 1-2psi out either way.
All of which is basic maintinance, all of which should be getting done anyway. I'll be sure to remind you next time you have a rant about "neglected learner bikes" that you've just practicly advised the guy not to service his bike, and not to clean and lube the chain. ____________________ Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340 |
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Teflon-Mike |
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Teflon-Mike tl;dr
Joined: 01 Jun 2010 Karma :
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Posted: 19:44 - 24 Jun 2012 Post subject: |
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_Iain_ wrote: | I'll be sure to remind you next time you have a rant about "neglected learner bikes" that you've just practicly advised the guy not to service his bike, and not to clean and lube the chain. |
I know, ironic ent it! I wasn't saying DONT do it... merely pointing out the ecconomics....
Go hunt out the 'service-spares' you need, and yeah, buy a half litre of oil at a time, they weigh up 'VFM' of a four liter bottle.....
Tally up your shopping basket, and at £90-£100 on a £200 Chinky bike, you are on the threshold of it being 'Beyond Ecconomic Repair'!
Not that servicing isn't worth doing..... but on low value chinkies, more a question of whether ANYTHING is worth doing!
nightshaddow wrote: |
changing sprockets will help with acceleration or top speed
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Knight wrote: | I agree with that. Mate of mine has a chinese 125 cruiser and after changing rear sprocket he swears he got extra 10mph. Now I'm not sure how accurate he is, but you may want to give it a shot. Don't expect epic results though, it's just 125 after all :/ |
Alpha-9 wrote: | It'll be either more acceleration and less top speed, or more top speed and less acceleration, upping number of teeth on the rear sprocket will do the latter, I believe |
Bigger the rear wheel sprocket, smaller the gearbox sprocket, 'lower' the gearing.
Smaller the rear wheel sprocket, bigger the gearbox sprocket, 'taller' gearing.
lower gearing = higher acceleration
taller gearing = higher top speed.
IN THEORY.
But, speed is an expression of 'power'.
Power = Force x Speed.
So Speed = Power / Force
Riding along, force you are working against is 'Drag', force you have shoving you is 'Thrust'.
And this is where it gets complicated!
Engine has a power curve. As the engine revs increase, so the power it makes increases, gets to a 'peak. then starts to drop off.
Coming from the engine, Power is Torque x Revs....
Gear up, and you increase the rear wheel revs, but you reduce the 'Torque' which is whats giving you the 'Thrust' to punch your way through 'drag'.
So, if you up-gear, it WONT necessarily make the bike any 'faster'.
Because the 'Thrust' you get from the motor isn't enough to over come drag... so the bike will actually go SLOWER.
Conversely, if you lower the gearing, you will increase the 'torque' and hence thrust at the rear wheel, which COULD give you some entra force to overcome drag and go a bit faster....
BUT depends on the shape of the power curve, where 'peak' power is 'made' and how much is drops off either side of that peak.
If you gear too high, then you will never get the engine to rev up to peak power and deliver full-force
Gear too low, you will run out of revs before you reach a road-speed where you lack 'thrust' to go any faster.
So to get 'best speed' its a question of finding the 'optimum' and finding the exact gear-ratio that gives you exactly the 'speed' that has the 'Drag' you have the power to beat....
Most bikes as standard are USUALLY slightly 'over-geared' so that the engine revs are knocked back for more relaxed 'cruising' at a speed a lot below thier pottential maximum.
So its more often that LOWERING the gearing, not only increases acceleration, but CAN see a few clics of extra speed.
BUT, thing to note is that GEARING doesn't 'set' how fast you can go...... but POWER.....
You can mess with years as much as you like, unless you have the engine power to make the THRUST force to shove you along that fast, you will NEVER go any quicker. ____________________ My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?'
Last edited by Teflon-Mike on 20:11 - 24 Jun 2012; edited 1 time in total |
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Mark2910 |
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Mark2910 Derestricted Danger
Joined: 16 Jun 2012 Karma :
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Posted: 20:08 - 24 Jun 2012 Post subject: |
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thanks for all the replies, will get a bigger bike once i sort a week off and get the test done and dusted. Got a quote for a Suzuki SV650 with a full bike license from carol nash, so thats my new plan.. i'll leave the 125 as it is, i could pour £ note after £ note and it wont be any better.
Cheers for the great advice |
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Old Thread Alert!
There is a gap of 6 years, 77 days between these two posts... |
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L33n |
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L33n L Plate Warrior
Joined: 23 Aug 2018 Karma :
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Old Thread Alert!
The last post was made 5 years, 231 days ago. Instead of replying here, would creating a new thread be more useful? |
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