derestrict 50 cc how much, diy

pip.1 · Derestricted Danger Joined: 31 Dec 2006 Karma :

How easy is it to derestrict a 50cc could this be done diy or would it have to be done by the proffesionals, thought this might be an option instead of the cbt and 125 cc route, save myself the £70 cbt cost.
Thanks in advance
____________________
He who dares wins ............................ Rodney

RS1Banger · Scooby Slapper Joined: 08 Oct 2004 Karma :

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 Confused

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)

john2 · Brolly Dolly Joined: 25 Mar 2006 Karma :

SilvaRizla · Spanner Monkey Joined: 30 Apr 2006 Karma :

^^^ Why? Its quite possible seeing how its a 2 stroke
____________________
I'm Ivan Dobski the Meatsafe Murderer only I never done it, I only said that I done it so they'd take the truncheon out of my bottom

pip.1 · Derestricted Danger Joined: 31 Dec 2006 Karma :

yes thanks for the info, was going to book cbt tomorrow, and get a 125 scooter, its a scooter im looking for first, mates got a peugoet scooter 50 cc 7 yrs old,thought about buying that but dont want to be stuck @ 35 mph,he bought it from new £1600.
____________________
He who dares wins ............................ Rodney

SilvaRizla · Spanner Monkey Joined: 30 Apr 2006 Karma :

If you're 17 or over sod the scooter and get a 125 bike,

the mito beats the 911 0-60
____________________
I'm Ivan Dobski the Meatsafe Murderer only I never done it, I only said that I done it so they'd take the truncheon out of my bottom

six · Trackday Trickster Joined: 29 Sep 2006 Karma :

Whosthedaddy · Super Spammer Joined: 11 Dec 2005 Karma :

pip.1 · Derestricted Danger Joined: 31 Dec 2006 Karma :

Thanks, im going to book cbt tomorrow and go for the 125,im well over 17.
pip
____________________
He who dares wins ............................ Rodney

six · Trackday Trickster Joined: 29 Sep 2006 Karma :

six · Trackday Trickster Joined: 29 Sep 2006 Karma :

derbi x-treme · Nova Slayer Joined: 25 Dec 2006 Karma :

85 mph is possible out of a 50 but would need to be tuned and have different sprockets. once your bike can reach max revs in top gear performance parts will only add acceleration the sprockets must be changed to get better topspeed. to get 85 mph you would need a single ring aluminium alloy cylinder big bore kit, a bigger carb high revving exhaust and carbon reeds and airfilter maybe even a performance ignition, also to handle this power youd need performance crank and bearings, you'd also need a new clutch to stop slipping and waay bigger front sprocket or smaller back sprocket about 16 48

Kal · World Chat Champion Joined: 02 Jan 2007 Karma :

RS1Banger · Scooby Slapper Joined: 08 Oct 2004 Karma :

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 Laughing

)
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" Shocked

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)

pip.1 · Derestricted Danger Joined: 31 Dec 2006 Karma :

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. Sick

____________________
He who dares wins ............................ Rodney

john2 · Brolly Dolly Joined: 25 Mar 2006 Karma :

I think you would need to spend more money than the bike is worth to get it to do 85MPH, thinking about it though, i suppose it would be possible as my RS50 did 62Mph standard (derestricted).

RS1Banger · Scooby Slapper Joined: 08 Oct 2004 Karma :

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 Shocked

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,

cestrian · World Chat Champion Joined: 24 Jul 2006 Karma :

derbi x-treme · Nova Slayer Joined: 25 Dec 2006 Karma :

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 Smile

cestrian · World Chat Champion Joined: 24 Jul 2006 Karma :

Please excuse me and my ignorance, is there a technical term for a 'high revving exhaust'?

derbi x-treme · Nova Slayer Joined: 25 Dec 2006 Karma :

technical term?

its usually just known as a performance exhaust and like i said offers a powerband at high revs

dont know what else to say lol

LeeWat · Nitrous Nuisance Joined: 12 Jun 2007 Karma :

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 Smile

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 Shocked

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.