re jetting carb
re jetting carb
I have a mk2.2 that im rebuilding,at the moment it has a dep tail pipe on and an after market filter,ive just brought some aktive reeds.The engine is a standard bore tho the rings seem to be abit worn so was thinking rather just messing about with rings getting the barrel borred .5 over and having a new piston to match to save messing with it again in the future.With this setup would i be best to re jet the carb?if so what sort of sizes would i be looking at and how mutch?cheers.
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oneandonly04
- New kid on the block
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- Posts: 45
- Joined: 23 Apr 2007, 05:51
- Location: !!!!Northern NSW,Australia!!!!
had the first over size rebore done on mine,i also run an rsv front pipe,dep tail pipe and a 'twin air' air filter.i've checked the plug colour at tickover,mid range and top end and it seems fine.done the best part of 4000 km since with out issue(bar the occasional off and breaking many non engine related bits 
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This is what i have done to my mk2 and it runs great 
HONDA CRM 250 mk2 03/12/06.
RE-BORED----1st OVERSIZE.
FULL RSV PIPE.
AIRBOX----STANDARD, WITH BAFFLE AND RESTRICTOR PLATE REMOVED.
SPARK PLUG----B9EGV----(BR8ES IS STANDARD).
PILOT JET-50----(48 IS STANDARD).
MAIN JET-135----(128 IS STANDARD).
NEEDLE POSITION----MIDDLE----(MIDDLE IS STANDARD).
AIR SCREW----1 1/4 TURNS OUT----(1 1/4 IS STANDARD).
HONDA CRM 250 mk2 03/12/06.
RE-BORED----1st OVERSIZE.
FULL RSV PIPE.
AIRBOX----STANDARD, WITH BAFFLE AND RESTRICTOR PLATE REMOVED.
SPARK PLUG----B9EGV----(BR8ES IS STANDARD).
PILOT JET-50----(48 IS STANDARD).
MAIN JET-135----(128 IS STANDARD).
NEEDLE POSITION----MIDDLE----(MIDDLE IS STANDARD).
AIR SCREW----1 1/4 TURNS OUT----(1 1/4 IS STANDARD).
[quote]going to try a TRX piston mod[/quote]
yes was going to get a wiseco piston,would be 67 oversize alltho mine is the standard bore i can can get a good deal on the piston if i go up to that size
The trx is the same size as the crm one i believe as long as you get the one from the right year 87-89 the only diffrence being the size or the pin being 1mm smaller but a new little end will sort that out i believe so shouldnt lower the compression
yes was going to get a wiseco piston,would be 67 oversize alltho mine is the standard bore i can can get a good deal on the piston if i go up to that size
The trx is the same size as the crm one i believe as long as you get the one from the right year 87-89 the only diffrence being the size or the pin being 1mm smaller but a new little end will sort that out i believe so shouldnt lower the compression
just orderd a shiny new wiseco piston 67mm quite a big step in bore size but couldnt turn it down for £32 posted may need to up the jet size now but will run it for abit first to see if all is well.i will be dropping the block off to pj engineers in wolverhampton as soon as it arrives to get the barrel bored to size,thought this was the best way to go rather than just spending £30+ just for some rings.(just hope it fitts 
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may need to up the jet size now but will run it for abit first to see if all is well.i will be dropping the block off to pj engineers in wolverhampton as soon as it arrives to get the barrel bored to size,thought this was the best way to go rather than just spending £30+ just for some rings.(just hope it fitts )