awh1 Posted January 9, 2022 Report Share Posted January 9, 2022 hi all , my sons 2010 evo 125 is having some issues can be a bugger to start , would rev tick over then just die then kick and kick no joy tilt bike to side with fuel out overflow would help get started again but same issues I've checked plug which was new last outing 2 weeks back as same issues and is sparking , stripped carb and a jet was a little blocked all cleared with an airline started back up and same issues wouldn't idle off choke but once bike warmed up by keep revving /blipping to intervene or riding it down lane it ticks over nice and only get a dip in engine note every 30 seconds or so at idle don't hear or feel a dip when riding it around coolant was a little low so topped up thinking couldn't it be getting hot but still same any help out there please driving us nuts now thanks Andrew Quote Link to comment Share on other sites More sharing options...
carl ekblom Posted January 10, 2022 Report Share Posted January 10, 2022 To me it sounds like you have a problem with dirt in idling system. Not easy to clean. Must take everything out from carb and carefully blow and clean. Remember to blow and clean all drillings and passages in carb body. After only use a good, clean and oiled airfilter and change often. As I see it, dirt in idling system is one of the most common problem in a dirt bike. If problem is only at certain throttle openings I would say it isn´t the ignition. Ignition problems is most often at all throttle settings. Quote Link to comment Share on other sites More sharing options...
awh1 Posted January 10, 2022 Author Report Share Posted January 10, 2022 thanks for the response 👍 I've taken carb apart twice , cleaned out with airline every jet blown through etc , 2nd time a piece came out of the jet which opened up quite a bit 2nd time I was adamant that that cleared out and topping up of the coolant would have been the cause but its still the same only thing I've yet to check is the breather pipes for any blockages , Quote Link to comment Share on other sites More sharing options...
carl ekblom Posted January 11, 2022 Report Share Posted January 11, 2022 It might be residues from air filter spray that follows the airstream into idle system and get stuck. It is not dissolved in clean petrol. Some people use Carb-Cleaner to dissolve. Have no experience of that liquid. When blowing, should use well filtrated HP-air. The passages are very small in the idling system so it can be difficult to clean. It happens it is a nightmare. Perhaps you should concentrate on cleaning the carb body and buy a new jet. As jets can be dirty from factory it is best to have it ultrasonic cleaned before assembly. For safety´s sake, HP-blow the jet after the Ultrasonic cleaning. Is it a Dellorto VHST or Kehin PWK? My last carb-cleaning-nightmare was approx 8-10 years ago with a Mikuni (original) on a Beta evo 4t. Eventually a man (not me) fixed it. 1 Quote Link to comment Share on other sites More sharing options...
carl ekblom Posted January 12, 2022 Report Share Posted January 12, 2022 Also check you don´t have an air leak. Quote Link to comment Share on other sites More sharing options...
awh1 Posted January 12, 2022 Author Report Share Posted January 12, 2022 (edited) thanks I will gave another look later and can then check what carb is on it any ideas on what jets should be in there tried looking on the beta online manual but no mentions of jet sizes cheers Andrew Edited January 20, 2022 by awh1 Quote Link to comment Share on other sites More sharing options...
awh1 Posted January 12, 2022 Author Report Share Posted January 12, 2022 checked carb it's a keihin pwk there appears to be some numbers ground off but can make out last bits it's ground away before the 9 9 OW18 not stripped back down yet to see what size jets are in there etc Quote Link to comment Share on other sites More sharing options...
carl ekblom Posted January 13, 2022 Report Share Posted January 13, 2022 As far as I know, usually no major problem with PWK. Splatshop are good at carbs and have spares,,jets etc https://www.splatshop.co.uk/performance-parts/keihin-pwk-spares.html Quote Link to comment Share on other sites More sharing options...
awh1 Posted January 18, 2022 Author Report Share Posted January 18, 2022 On 1/13/2022 at 4:03 PM, carl ekblom said: As far as I know, usually no major problem with PWK. Splatshop are good at carbs and have spares,,jets etc https://www.splatshop.co.uk/performance-parts/keihin-pwk-spares.html thanks will take a look Quote Link to comment Share on other sites More sharing options...
awh1 Posted January 20, 2022 Author Report Share Posted January 20, 2022 Well took bike back out same thing got it warmed up drove it up the road then died kicked for ages no chance , popped a new plug in and all fine tonight I've stripped carb again let the jets soak in some carb cleaner for a bit then airline blew it all out they did look blocked again , I noticed a breather pipe was missing so not sure if that could draw dirt in ? also took not of jets 52 pilot 130 main didn't really want to mess with jets as about 2 years back when it was in use no problems at all and just been sat around unused til last few weeks again cheers Quote Link to comment Share on other sites More sharing options...
lineaway Posted January 20, 2022 Report Share Posted January 20, 2022 keihin has a problem with the jet tower. The piece with the security torx. Thats the only way to clean the carb. Oh yeah , the o ring gasket should be replaced. Quote Link to comment Share on other sites More sharing options...
awh1 Posted January 21, 2022 Author Report Share Posted January 21, 2022 19 hours ago, lineaway said: keihin has a problem with the jet tower. The piece with the security torx. Thats the only way to clean the carb. Oh yeah , the o ring gasket should be replaced. can you advise where the o ring gasket is or where to buy from tbh didn't really notice a torx bit in there lol Quote Link to comment Share on other sites More sharing options...
lineaway Posted January 21, 2022 Report Share Posted January 21, 2022 Once you remove the jet tower, the gasket is really obvious. It takes a security torx to take it apart. It used to be you could not get the gasket. You tube Keihin jet tower. I never would of touched it until it left me no choice. But that is where the real problems exist. Quote Link to comment Share on other sites More sharing options...
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