1996 Honda CR125 ,

4/26/2016 1:51am Edited Date/Time 10/14/2020 6:01pm
Hi guys , I have recently bought a 1996 CR125 that is undergoing a rebuild .
I have read that there are tuning mods from standard that help raise the rpm up to 12-12500 rpm .
These included change the barrel to a 1992 and the cylinder head to a 1991 with a domed piston , also fitting 1999 power valves .
A few questions , 1/ will this all work
2/will the 1996 exhaust still fit or do you have to fit a 1992 exhaust and adapt
3/ will just fitting a domed piston to the 1996 barrel and fitting 1991 head be better than stock.
4/ does anyone else have any better ideas of tuning the 1996 to make it a revvy machine ?
Many thanks in advance
Philip
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CrGuy2T
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Santa Fe, TX US
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4/26/2016 5:29am
I want to say I read something about an 89 crank and electronics. Seems like that's what pro circuit was using in their bikes. I can't remember where I read that. Inthibk it was in a build thread here.
billyslad
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4/26/2016 11:34pm
Changing the CDI will change the ignition curve porting can change curve also as it will affect port timing
An exhaust can also affect where the bike revs as will carburation in my experience all of these things will move power up or down but compromise elsewhere
Porting /increasing compression and other mods will help smooth out those compromises to suit where you want your curve and power
If your going to increase compression you may consider a race fuel Vp C12 or elf do a similar one this help avoid detonation
Oval boring the carb is another mod used to increase top end but will work best with a different ignition timing or CDI as well as race fuel
Most mods work well as a package and you are best discussing this with a tuner or two to try and pool their knowledge and decide a way forward
Or you could just buy an RM haha
bad juju
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5/1/2016 12:13pm
eric gorr has a tuning section you can read. its a good read for ya..

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MaxPower
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5/1/2016 4:55pm
I had a 94 CR. That bike ripped. You dont need to mess with the 96 too much to make it run
90s mxer
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Yarra valley AU
5/3/2016 12:27am
Mate I just did a complete overhaul 96 cr125 if its fresh as in engine wise cylinder and all internals set of reeds ,jet it correctly with a pc pipe + muffler or bills if you can find one and the bike will rip

4
JakeB709
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Alpharetta, GA US
10/14/2020 6:01pm
just bought one $400, but i don't have a top end and my crank is cracked about a 2 inch square hole above my reed, Anyone know where i can get both sides of the crank case or other years that work with it, Honda,partzilla etc don't have both sides

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