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help diagnose with pic's
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[QUOTE="woodsy, post: 710969, member: 27856"] Hi Jack: THe shot of the top of the piston seems to show some exhaust and intake side lean signs (from what I can see). You couldvery well be pulling air creating a lean condition. If it were mine I would remove the flywheel cover and the clutch/right side cover. I would then stuff the crankcase opening (where the jug meets the bottom half) with rags around a short piece of 3/4 inch conduit. Now, lite a cigarette and blow smoke into the crankcase (do like Bill and dont inhale) with as much pressure as you can push - if you can't keep the smoke from seeping around the rags - dampen them!! Turn the crank and try to move the crank ends both in and out and up and down while you do the smoke check. If you get ANY smoke of ANY amount from either end of the crank or center seal you are in for a split... Next check the roller that pushes the power valve open. If memory serves me correctly that valve is not checkable for "return" without the motor running (it works off centrifical force) but you can at least examine the components to make sure they are still intact and not worn to badly. You said youtried unsuccessfully to jet the bog out, did you jet via the needle? Moving the clip up the needle will lean and down the needle will richen - where are you in this adjustment and does the bog decrease as you richen? ANother item to consider when jetting is fuel level in the bowl. The amount of fuel avaliable has a DIRECT affect on how your jets perform - I know a TON of mechanics that doent agree with this and thats OK - IT STILL DOES!!!! Make sure that your float level is SPOT ON!! Also, the seal on the pipe (I believe that bike is new enough to use a set of rubberized "o" rings on the pipe) has to be good as it is possible to suck air back into the jug from this area! Of course, the intake manifold and base gasket are suspect also.. Reed valves can also attribute MAJORLY to a condition as you explained - what are the condition of yours? Can you see air under them? Have you miked your piston and cheacked clearances yet? I see your piston is stock size and that particular bike has an IRON cylinder - unless someone NEVER rode it or changed jugs on it recently it should have been bored a couple times by now just to freshen it up.. I would suspect that a 1st over bore with a new piston and rings would REALLY help you out with your bottom end needs!!! Final jetting should be done thru plug chopping!! It is the ONLY way to tell if your jetted correctly! Jetting to get rid of the bog is a questionable practice and should really be done only to diagnose problems IMHO.. NOW - have you checked your ports for port work? It was customary a few years ago for anybody who could afford a $15 die grinder to cut their own ports - I HAVE SEEN UNBELIEVABLE THINGS DONE SO DONT LAUGH!! I remember vividly a bike coming iinto the shop for repairs that was cut so badly that it ran at WOT or didnt run at all simply because of this BLUNDER!! Take a close look and MAKE sure that yours have not been altered!! My 2cents Woodsy [/QUOTE]
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Who to Ride With, Where to Ride
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help diagnose with pic's
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