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pip.1 |
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 pip.1 Derestricted Danger

Joined: 31 Dec 2006 Karma : 
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RS1Banger |
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 RS1Banger Scooby Slapper
Joined: 08 Oct 2004 Karma :  
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 Posted: 08:46 - 12 Jan 2007 Post subject: |
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err
what sort of ped?
some are a washer or dead end pipe on the exhaust
combined with a variator restriction
and in some cases a rev limiter
its a piece of cake if you can read and follow a set of written instructions
but some peds are designed slow so you cant make them go faster
geared mopeds can be tuned up very nicely
i had a water cooled geared moped (rieju rs1) for a while,
after i'd tuned it up it did 85 - far quicker than the 125 i've got now
also it did have the advantage that i didn't need L plates or CBT and i could take a passenger (car test passed in '91) |
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john2 |
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 john2 Brolly Dolly
Joined: 25 Mar 2006 Karma :    
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 Posted: 12:07 - 12 Jan 2007 Post subject: |
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RS1Banger wrote: | err
what sort of ped?
some are a washer or dead end pipe on the exhaust
combined with a variator restriction
and in some cases a rev limiter
its a piece of cake if you can read and follow a set of written instructions
but some peds are designed slow so you cant make them go faster
geared mopeds can be tuned up very nicely
i had a water cooled geared moped (rieju rs1) for a while,
after i'd tuned it up it did 85 - far quicker than the 125 i've got now
also it did have the advantage that i didn't need L plates or CBT and i could take a passenger (car test passed in '91) |
Hmm, somehow i dont believe it did 85  |
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SilvaRizla |
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 SilvaRizla Spanner Monkey
Joined: 30 Apr 2006 Karma :     
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pip.1 |
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 pip.1 Derestricted Danger

Joined: 31 Dec 2006 Karma : 
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SilvaRizla |
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 SilvaRizla Spanner Monkey
Joined: 30 Apr 2006 Karma :     
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six |
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 six Trackday Trickster

Joined: 29 Sep 2006 Karma :     
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Whosthedaddy |
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 Whosthedaddy Super Spammer
Joined: 11 Dec 2005 Karma :    
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pip.1 |
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 pip.1 Derestricted Danger

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six |
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 six Trackday Trickster

Joined: 29 Sep 2006 Karma :     
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six |
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 six Trackday Trickster

Joined: 29 Sep 2006 Karma :     
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derbi x-treme |
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 derbi x-treme Nova Slayer
Joined: 25 Dec 2006 Karma :  
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Kal |
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 Kal World Chat Champion

Joined: 02 Jan 2007 Karma :   
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 Posted: 06:33 - 13 Jan 2007 Post subject: |
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six wrote: |
Surely different sprokets will throw the speedo out of sync or something? Thats what I heard. |
Depends on the bike. The speedos on all of my bikes are driven off of the front wheel so the speedo would only need adjustment if there was a smaller/larger front wheel fitted.
However I believe there are some bikes out there with a speedo driven off of the rear wheel/gearing. Have a look and see where your cable goes.
six wrote: |
If you change the sprokets... gaining acceleration = reducing top speeds and gaining top speeds = reducing acceleration. Again, thats what I was lead to believe. |
You are right. It's a trade off between ultimate speed and torque which govens both your acceleration and the weight your bike can carry without straining the engine.
six wrote: |
So, getting a less restrictive exhaust will increase the flow of air?
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That's pretty much why race cans are so loud. No baffles - less restrictive. Although changing the exhaust can mean having to get the bike dyno jetted to match for best performance.
If memory serves though upgrading the power would boost it out of the Moped catagory and slap it into the catagory A1 light motorcycle. Provided it is producing less then 14.6bhp that is.
If its producing more than that you are looking at requiring a full motorcycle licence rather than a CBT and L plates to ride it legally.
six wrote: | surely if you already have a CBT you can just ride any 125 after 17 anyway? You don't need to retake your CBT, it will last you for 2 years. |
Any 125 less than 14.6bhp. You are right about the CBT, the only times you need to take it is if your currant one runs out or you are instructed to after a run in with the law. ____________________ Kal...
I Like To Hoon It Hoon It I Like To Hoon It Hoon It I Like To Hoon It Hoon It Ya Like To (HOON IT!).
1984 GB250 Clubman,1983 CB250N Superdream, 1999 GPZ500S |
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RS1Banger |
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 RS1Banger Scooby Slapper
Joined: 08 Oct 2004 Karma :  
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 Posted: 10:01 - 13 Jan 2007 Post subject: |
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lol
the moped had
75cc single ring kit (regularly cleaned internally)
21mm carb (jetted rich to avoid overheating)
bent back reeds stop
yasuni exhaust (very good high revving pipe for smaller 2t, quiet too)
stronger clutch springs
biggest front cog available
smaller back cog (not smallest, should have been)
it could have done with
a stronger crank (stock one was on its way when i sold it )
bigger carb
smallest back cog
v-force reeds
it did 85 on the tomtom, the speedo never worked,
with rider tucked in it held 85 up hills and into headwinds,
cos of this i think it would have gone more but for the gearing
the right lunatic with more money than me/sense could probably see 100mph out of a tuned "moped"
legally, i think its likely it was over the 125 power limit let alone the 30mph moped law, so technically it required a full bike licence
as for the peugoet scooter (back on topic!), they're held back by a dead end pipe on the exhaust and a variator restriction plate, cut/whip these out and they do 55 or 50 (lc or ac) |
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pip.1 |
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 pip.1 Derestricted Danger

Joined: 31 Dec 2006 Karma : 
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 Posted: 13:06 - 13 Jan 2007 Post subject: |
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Thanks i might consider it then , use the thread for whatever topic you see fit, all interesting stuff.Wouldny fancy doing 85mph on a ped though.  ____________________ He who dares wins ............................ Rodney |
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john2 |
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 john2 Brolly Dolly
Joined: 25 Mar 2006 Karma :    
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RS1Banger |
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 RS1Banger Scooby Slapper
Joined: 08 Oct 2004 Karma :  
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 Posted: 09:24 - 14 Jan 2007 Post subject: |
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more money than its worth?
i only spent £100 cos i got everything second hand, and the bike for £200
but the same kit as i had (TOP) but with a long throw stronger crank (85cc) is just over 200 quid
you need a decent exhaust, that will rev hard to at least 12000, so thats another £120
a large carb (24 or 28)too, and manifold to match, thats another ton
large front, small rear sprocket £15
clutch springs £4
so you're talking 450 quid, but then it would be faster than mine was
and probably faster than most 125s
at the time my next door neighbour had an ancient gsx250, which was no faster than my ped and handled worse, |
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cestrian |
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 cestrian World Chat Champion

Joined: 24 Jul 2006 Karma :   
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derbi x-treme |
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 derbi x-treme Nova Slayer
Joined: 25 Dec 2006 Karma :  
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 Posted: 17:55 - 22 Jan 2007 Post subject: |
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a high revving exhaust is an exhaust that only has power in high revs giving a concentrated powerband. a normal exhaust for cruising around will have power spread throughout the rev range but a high reving exhaust will give you a sudden boost once it hits certain revs, typically around 8000-12000 on most high reving ones but you can get ones with higher powerbands. an aluminium or alloy single ring borekit allows the engine to rev much higher and more easily. the single ring creates less firction than the double ring and also the bottom ring of a twing ring can flutter at high rpm so this is prevented. also becuase its aluminium it dissipates heat faster so it performs better. the expensive borekits also have tuned porting which adds to power. to run these parts without damaging the bike you would have to upgrade the crank and bearings. however i think the standard cooling system would be fine but would be a good idea to run it on the fully synthetic oil  |
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cestrian |
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 cestrian World Chat Champion

Joined: 24 Jul 2006 Karma :   
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derbi x-treme |
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 derbi x-treme Nova Slayer
Joined: 25 Dec 2006 Karma :  
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LeeWat |
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 LeeWat Nitrous Nuisance
Joined: 12 Jun 2007 Karma :    
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 Posted: 12:57 - 12 Jun 2007 Post subject: High revving exhaust |
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Back in the mists of time, 19 years ago to be precise us 2 stroke loonies just refered to high revving exhausts as either Microns or Allspeeds
btw, i had a tuned up RD125LC that went at nearly 120mph.
Allspeed Exhaust, filed out inlet and outlet ports, bigger main jet, K&N air filter. Easy jobs to do, powerband was about 6500 and you knew about it when you got there
The only downside was with the power increase, i had to put in heavy duty (racing) aluminium clutch plates and replace the standard chain & sprockets with heavy duty ones. ____________________ Simson S51 Enduro, Kawasaki AR80, Yamaha RD125LC, Yamaha XV535, Yamaha XJ600N, Suzuki GS1100G, Kawasaki KLR250, Yamaha BT1100 Bulldog (4/4/08 Deceased). Suzuki XF650 Breakwind. |
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Old Thread Alert!
The last post was made 18 years, 46 days ago. Instead of replying here, would creating a new thread be more useful? |
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