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ilonasn |
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ilonasn L Plate Warrior
Joined: 19 May 2018 Karma :
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Posted: 14:04 - 19 May 2018 Post subject: Add a 5th gear or gearbox upgrade. |
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Hi
I have a Malaguti Motard X3M 125cc from about 2010.
The front sprocket has 13 teeth and the rear sprocket has 51 teeth.
Hills are never a problem now but on straight roads, the bike is maxed out in 4th gear and another gear would be the ultimate driving experience , or is there an upgrade available , maybe an XT one would fit since it is a Yamaha engine.
Cheers,
ilona
Last edited by ilonasn on 22:47 - 20 May 2018; edited 1 time in total |
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P. |
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P. Red Rocket
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Howling Terror |
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Howling Terror Super Spammer
Joined: 05 Dec 2008 Karma :
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Posted: 14:16 - 19 May 2018 Post subject: |
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How heavy are you?
Is your chin touching the tank?
Is the chain oiled?
Is the gearing standard....It'll be the best compromise for most people eg a small light rider may eek a bit more topspeed with taller gearing.
1) Buy a lighter 125cc bike with a fairing.
2) Buy a bike with a bigger engine. ____________________ Diabolical homemade music Bandcamp and Soundcloud
Singer songwriter, Artist and allround good bloke Listen to Andrew Susan Johnston here
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ilonasn |
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ilonasn L Plate Warrior
Joined: 19 May 2018 Karma :
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P. |
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P. Red Rocket
Joined: 14 Feb 2008 Karma :
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Posted: 15:13 - 19 May 2018 Post subject: |
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no, thats fucking retarded.
Replace the engine with the XT one. |
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MarJay |
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MarJay But it's British!
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- Super Spammer
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Pete. |
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Pete. Super Spammer
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Rogerborg |
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Rogerborg nimbA
Joined: 26 Oct 2010 Karma :
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Posted: 21:17 - 19 May 2018 Post subject: |
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MarJay wrote: | You just buy the extra gear, then place it on the side of the engine, then hit it with a hammer until it goes into the gearbox. |
It's a Malaguti, not an Enfield.
As above, if you want to keep the same chain you could try 14 / 51 for about +10% more speed[*] per revs or 15 / 50 for a whopping 20%. If you have enough slack you could go to a 14 or 15 on front without reducing the rear, or drop 4 or more off the rear and lop some chain links out.
Just going +2 on the front might sound extreme but it was a common mod on my HN125-8 and worked well in practice to give a less frenetic ride, although it didn't make them any quicker.
[*] I mean, notionally faster. In practice, you may find the revs drop so much when you change up that you end up worse off. You can't magic any more power out of the engine, or widen its powerband (although you could fit a red one). ____________________ Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike |
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ilonasn |
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ilonasn L Plate Warrior
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Teflon-Mike |
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Teflon-Mike tl;dr
Joined: 01 Jun 2010 Karma :
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Posted: 22:05 - 19 May 2018 Post subject: |
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Basic primary laws of fizzix.. power=rate of work done, work done is force times distance, so power is force times speed.
Gears. Rotary levers. They can magnify force for a proportional reduction in speed, or increase speed for a proportional reduction in force.
You have a 10bhp, 4-stroke 125, dirt-bike with road-tyres... relatively speaking its tall and wide, and spreads you, the rider out like a human parachute when riding to increase the frontal area drag acts on.
With a finite amount of power, it isn't going to go any quicker, no matter how many gears you got or how you mess with the ratios.... the 'problem' isn't that you dont have enough gears to pick from, its that you dont have any more power.
Raise the gearing; use 14-52 combination or 12-48 combination, it will NOT defy the laws of phisics and suddenly let the bike top out at 120mph... because you still have the same amount of power... it will go just as slowly as before.
All you MIGHT achieve is to shift the top-out point an MPH or so either way; with lower gearing you will reach revs with more power to spare than is needed to reach max speed and so cant go no faster, or you will reach a speed where the resistance force is higher than you have power to over-come, and you'll top-out before you completely run out of power, but be unable to go faster, and maybe get at the engine revs you have a bit more, because the resistance force is always more than the driving force.
With taller gears, you might be able to go a tad quicker... down hill..... where the potential energy of being at the top of a hill, adds to the power the engine may make....
But back to square one..... power is force times speed.... you don't need more gears, you need more POWER!
Again... You have a 10bhp, 4-stroke 125, dirt-bike with road-tyres... relatively speaking its tall and wide, and spreads you, the rider out like a human parachute when riding to increase the frontal area drag acts on.
You want it to go faster on the flat... you need more power or less drag..... that means a bike with a smaller frontal area and pointy fairings... and oooh... with just 10bhp it STILL wont go much if any faster.... look at the specs... so you still need more power....
A 125cc four-stroke single, at BEST, might make oooh, all of 17bhp...... eg YZF-R125.... water-cooled, double-over-head-cams, four valves, fuel injected... and a lot of expensive tuning goodies and work chucked in to get it... briefly....for as long as the cylinder head gasket dont go pop......
Probably the most powerful air-cooled, two-valve 125cc single was the 1973 Honda CB125 motor, that the XL lumps were later based on... managed a heady 13bhp.. and was successively detuned year on year by the factory as it had a habbit of eating its own cam-shafts.
Doubled or quadrupled up, to make a twin or four cylinder engine..... two-valve air cooled engines topped out at around 100bhp per litre.... about 0,1bhp per cc... that's multiplies out to.... oooh.. about 12.5bhp from a 125cc engine.....
Think you can do better than Honda, Suziki, Kawasaki, Yamaha, Ducatti or BMW's enormouse R&D departments? Go for it!!!!
You will NEVER manage to get much more than 13bhp from that engine, no matter how much you do to it... and without that extra power, it will not go any faster on the flat regardless of how you mess with gears.
As has been said... you want more than what you got... buy another bike.... and even then, another 125 will probably still not be much if any different, all of them having the same 'problem' that limited to just 125cc they are also limited to how much power they may make, and you are in a world of slow, where even the fastest of the fast, two-stroke 125's, that might just top a ton, are only barely as 'fast' as thirty year old 250 commuter bikes, let alone anything bigger, newer or more sporty.
What you have is what, eight years old; and no spring chicken... and fact you say its from 'about' 2010.. does make me wonder how legit it is, and whether its even a road legal bike, not a probably stolen or scrapped field-bike... or you should know EXACTLY how old it is and when it was first registered for the road...... but just on age alone, its likely not making all the power or able to go as fast as it should, after almost a decade of learners fiddle fingers trying to 'fix' it....
Old track addage, before looking for more than standard, make sure you have all you have AS standard... and if that aint enough... rather than try re-invent the wheel, look for a different standard that gives you what you want...... ____________________ 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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- Super Spammer
Joined: 22 Oct 2013 Karma :
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Posted: 01:28 - 20 May 2018 Post subject: |
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Pete. wrote: | mpd72 wrote: |
There's a good reason for that.
If you're maxing it out in top gear, just up the final drive gearing by adding a couple of teeth at the rear or 1 at the front - and by "add" I don't mean stick another couple on with superglue.
You'll lose a bit of acceleration, but gain taller gearing so won't need to be revving the tits off it in top gear. |
Adding 2 teeth on the rear sprocket will make things worse. He needs to reduce the size by a couple of teeth. |
Sorry, yes. Bigger front, smaller rear.
Irrelevant anyway, because OP appears retarded. ____________________ TZR250 2MA road, TZR250 1KT road, TZR250 2MA race, TDR250, YZF-750R Boost colours.
Jaguar S Type 3.0 V6 Sport R, VW Transporter T5 GP LWB Shuttle 140ps DSG. |
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MarJay But it's British!
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ilonasn |
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ilonasn L Plate Warrior
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Posted: 23:25 - 20 May 2018 Post subject: |
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ilonasn L Plate Warrior
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Old Thread Alert!
The last post was made 5 years, 333 days ago. Instead of replying here, would creating a new thread be more useful? |
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