bezerk Posted February 13, 2011 Report Share Posted February 13, 2011 Hey all, Looked for this on other posts, but nothing seems to cover this one... My boys old ty80 starts lovely, ticks over and revs perfectly... But when riding it bogs and stops, obviously when in gear, pull the clutch in, rev it through... all great again. Fuel fresh, carb and filter clean. Any ideas anyone? Quote Link to comment Share on other sites More sharing options...
dombush Posted February 13, 2011 Report Share Posted February 13, 2011 Bezerk obviously diagnosis at this distance its just guesses... however, here's a few. At a basic level, bogging when the bike heats up spells rich mixture.. but.... Have you had the plug out immediately post bog (to see if its rich or lean) Does it smoke heavily when its bogging (rich..carb float issues, does fuel leak out of the overflows)? have you tried applying choke mid bog (if its weak, this will perk it up at low revs, if its already rich this will kill it completely) Have you tried removing the fuel cap just in case the tank breather is blocked. how far do you ride before it bogs (if its +5 mins it might be overheating.. ign timing) Does the exhaust note sound strangled or muted (clogged exhaust... overheating) have a look at the ignition timing marks.. are they correct It could be a dodgy plug/coil electrics but this doesnt sound likely given the description. Generally these work or they dont. So, some ideas there... good luck Dom Quote Link to comment Share on other sites More sharing options...
feetupfun Posted February 14, 2011 Report Share Posted February 14, 2011 If bogging means the motor dies as the throttle is opened, it may be a blocked or partially blocked pilot jet (lean mixture as throttle opened). dombush's choke test will test this possibility Quote Link to comment Share on other sites More sharing options...
thedktor Posted February 14, 2011 Report Share Posted February 14, 2011 If bogging means the motor dies as the throttle is opened, it may be a blocked or partially blocked pilot jet (lean mixture as throttle opened). dombush's choke test will test this possibility Yup exactly what I was going to say - I have several TY80's and the pilot jets are forever blocking as they are soooo small and the tiniest bit of rust/dirt from the tank blocks em good and proper.... Quote Link to comment Share on other sites More sharing options...
bezerk Posted February 14, 2011 Author Report Share Posted February 14, 2011 Guys, Thanks for the reply... It doesn't bog or splutter until there is a load (ie, in gear and moving) then it behaves exactly as if it was a fuelling issue (it sound/feels perfect when ticking over or reving it up, even when I shake it around) See why this one is a strange one? Quote Link to comment Share on other sites More sharing options...
thedktor Posted February 14, 2011 Report Share Posted February 14, 2011 OK, but this is exactly the symptoms I get with a blocked pilot [on a TY80], so I would check this first, and then move onto the more serious stuff..... Quote Link to comment Share on other sites More sharing options...
bezerk Posted February 14, 2011 Author Report Share Posted February 14, 2011 Thanks, I'm on it... I'll keep you informed. Quote Link to comment Share on other sites More sharing options...
gazer Posted February 14, 2011 Report Share Posted February 14, 2011 (edited) try riding it without the airfilter in,if it runs ok without the filter, then theres not enough air getting to the carb making the mixture rich whenyou put it under load Edited February 14, 2011 by gazer Quote Link to comment Share on other sites More sharing options...
bezerk Posted February 14, 2011 Author Report Share Posted February 14, 2011 try riding it without the airfilter in,if it runs ok without the filter, then theres not enough air getting to the carb making the mixture rich whenyou put it under load Done that one, but thanks for the thought... talked to a bloke at Gordon Farley today and he had the thought that it could be electrical condenser, points, as its occurring under load, fair point!, also we kinda agreed its unlikely to be a carb issue as it idles, revs cleanly whilst standing (though Im ruling nothing out )... thoughts? Quote Link to comment Share on other sites More sharing options...
badmotofo Posted February 14, 2011 Report Share Posted February 14, 2011 A friend of mine years ago had a similar symptom. Turned out to be that the muffler was clogged. A fresh repack and all was good again. Might be worth looking at. MB Quote Link to comment Share on other sites More sharing options...
bezerk Posted February 15, 2011 Author Report Share Posted February 15, 2011 A friend of mine years ago had a similar symptom. Turned out to be that the muffler was clogged. A fresh repack and all was good again. Might be worth looking at. MB Thanks for that ill... check it out and report back. Quote Link to comment Share on other sites More sharing options...
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