zerorev3rev4 Posted May 20, 2018 Report Share Posted May 20, 2018 Got a 2006 250 rev 3 with low use having trouble with an erratic running when warmed up pulls through gears fine but looses response just off tick over goes droggy n plenty pinking Almost like it's too rich but with pinking at same time to date I've changed Crank bearings and seals rings case gasket cylinder gasket new plugs of differnt heat range stator and cdi brand new and good used coil Inc lead n cap kill switch disconnected 2 carbs Reed block assembly flywheel new air filter tank drained tap cleaned out can't pick up on any air leaks spraying carb cleaner around it problem was there before rebuild n suspected Crank seal I am thinking it needs a crankcase pressure drop check. Just pulled head wondering if rod was bent piston comes up square but not level with cyl top ie 2 to 3mm lower is this normal Quote Link to comment Share on other sites More sharing options...
lineaway Posted May 20, 2018 Report Share Posted May 20, 2018 That seems normal. Looks like you have tried everything. I worked on an `06 that just never seemed to hit right just off idle. Never did figure it out. Owner let it go cheap. Never heard any more about that bike. Let us know if you ever figure it out. Change the ground? Check wiring harness as could be pinched. I also had an `03 that I swear did not have any real power. It ran ok, just not as good as others. And it was a 270. Quote Link to comment Share on other sites More sharing options...
scifi Posted May 20, 2018 Report Share Posted May 20, 2018 I think you have changed so many things, it's not the same bike... Just off tick-over is in the carburettor range of the slide cut away, and to a lesser extent upon the needle position in the slide. You could try moving the needle up a notch, but maybe the answer is to get a slide with less cut away, to make it richer in the transition. I assume the previous owner has not put the High Compression head on it, which would need higher octane fuel...? Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted May 20, 2018 Author Report Share Posted May 20, 2018 (edited) As far as I know the head is standard I've had it 6/8 years id say it went like this gradually just wouldn't run right low down at a trial. Had 2 differnt carbs one brand new from 07 250 which I'd say is like a motocross bike in comparison swapping stator n cdi is all the loom involved with spark. I added a separate ground to coil and thought I'd fixed it but nope. On a cool day it could take half hour or more to occur on a hot day as today 10 mins Edited May 20, 2018 by zerorev3rev4 Spelling Quote Link to comment Share on other sites More sharing options...
naichuff Posted May 20, 2018 Report Share Posted May 20, 2018 (edited) Although not the same type of bike I had a similar problem with a cub put a slide with less cutaway cured the problem until the lad that rides it change the exhaust and the fault returned So it is something else easy to check My 200 rev 3 goes off tune when it needs cleaned and repacked Edited May 20, 2018 by naichuff add Quote Link to comment Share on other sites More sharing options...
copemech Posted May 21, 2018 Report Share Posted May 21, 2018 Perhaps the exhaust is grunged up Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted May 21, 2018 Author Report Share Posted May 21, 2018 Can't visually see a fault with exhaust definitely not oiled up more on the dry side. Tried the new carb from other bike which runs very good and no difference Quote Link to comment Share on other sites More sharing options...
2stroke4stroke Posted May 21, 2018 Report Share Posted May 21, 2018 You need to pull the silencer apart to really see. Or try the silencer off the other bike? Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted May 21, 2018 Author Report Share Posted May 21, 2018 Can see straight through silencer I did have it apart to check wadding which wasn't that old Quote Link to comment Share on other sites More sharing options...
digger144 Posted May 22, 2018 Report Share Posted May 22, 2018 check breather pipes from carb this can cause weird problems if blocked Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted May 22, 2018 Author Report Share Posted May 22, 2018 Had 3 different carbs on it now but yes had that before with snow. Done a leak down test and holds 25 psi no signs of a leak Quote Link to comment Share on other sites More sharing options...
scifi Posted May 22, 2018 Report Share Posted May 22, 2018 Don't know if you want to take the head off again, but that ring of carbon at the top of the cylinder could be glowing, and causing the pinking... Or is the fuel very old or of low octane rating..? Also, is there a specific way of getting the coolant back into the cylinder once you have taken the head off..? Maybe you have an air-lock, causing overheating...? . Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted May 22, 2018 Author Report Share Posted May 22, 2018 Fan works as it should coolant level OK no loss or pressure build up fresh fuel tank n tap cleaned carbon on piston top is prob only after 3 to 4 gallon use so soon recarboned up fuel is standard not high octane but not from super market did try hi octane but wasn't much better if any Quote Link to comment Share on other sites More sharing options...
huski Posted May 23, 2018 Report Share Posted May 23, 2018 Probably not what you want to read,but we had a2007 rev3 which wouldn't run right when hot and it defied all our attempts to fix it too.Gave up with it in the end,too frustrating Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted May 23, 2018 Author Report Share Posted May 23, 2018 Seem to think this water gallery across front of Crank case has been blocked off could this cause the problem. Case getting too hot? Quote Link to comment Share on other sites More sharing options...
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