Mark Halford Posted June 19, 2016 Share Posted June 19, 2016 hi I've got a Yamaha aerox 100 2002 and I'm experiencing power problem so much I can even hold the bike back. I've cleaned the exhaust and carburettor and tweaked the fuel to air mixture but It still lacks power, I think the carb might of had it. any ideas much appreciated thanks mark Link to comment Share on other sites More sharing options...
Variomatic Posted June 19, 2016 Share Posted June 19, 2016 Perhaps an air leak between the carb and the bike, or perhaps the air filter and the carb. Perhaps a crank seal? (These are 2 stroke? right?) When did this start happening? 1 Link to comment Share on other sites More sharing options...
KevtheRev Posted June 19, 2016 Share Posted June 19, 2016 It's a process of elimination kid . First check for visual things like cracks in the manifold rubber / bad airbox seal , new plug , filter etc . Make sure you have the carb back to base settings and then you can make a start . Link to comment Share on other sites More sharing options...
Mark Halford Posted June 19, 2016 Author Share Posted June 19, 2016 variomatic, it's got 2 brand new crank seals and a new air filter but I'm not too sure the air box is air tight, I'll try that first. I also turned the fuel to air screw fully in and the bike kept running is that supposed to happen? thanks Link to comment Share on other sites More sharing options...
Variomatic Posted June 20, 2016 Share Posted June 20, 2016 19 hours ago, Mark Halford said: variomatic, it's got 2 brand new crank seals and a new air filter but I'm not too sure the air box is air tight, I'll try that first. I also turned the fuel to air screw fully in and the bike kept running is that supposed to happen? thanks There are specific settings for those screws, usually measured in number of turns, they probably shouldn't just be bottomed out, this is likely a part of the issue. Perhaps the crank seals weren't done correctly. Link to comment Share on other sites More sharing options...
Mark Halford Posted June 20, 2016 Author Share Posted June 20, 2016 ok I had the crank seals done twice and I'm pretty sure there ok. I figured out its one and a quarter turns on fuel to air mix but I'm not sure if my carb is working correctly tbh its the only thing I haven't changed on the bike atm also what size carb and jet would you recommend? I'm running everything standard except for a technigas exhaust Link to comment Share on other sites More sharing options...
Mark Halford Posted June 21, 2016 Author Share Posted June 21, 2016 I think I might take it to a specialist Link to comment Share on other sites More sharing options...
Moderator drewpy Posted June 21, 2016 Moderator Share Posted June 21, 2016 18 hours ago, Mark Halford said: also what size carb and jet would you recommend? I'm running everything standard except for a technigas exhaust needs rejetting, I fitted a new exhaust on an Aprilia SR and got a mains kit from SIP to tune it in Link to comment Share on other sites More sharing options...
Mark Halford Posted June 21, 2016 Author Share Posted June 21, 2016 4 hours ago, drewpy said: needs rejetting, I fitted a new exhaust on an Aprilia SR and got a mains kit from SIP to tune it. ok bud what size jet and carb you recommend? ok bud what size jet and carb u recommend? Link to comment Share on other sites More sharing options...
Moderator drewpy Posted June 21, 2016 Moderator Share Posted June 21, 2016 4 hours ago, Mark Halford said: ok bud what size jet and carb u recommend? there's no answer, thats why you buy a jet kit and see what happens, its cheaper that way believe me. Keep the carb, just rejet it Link to comment Share on other sites More sharing options...
blackhat250 Posted June 21, 2016 Share Posted June 21, 2016 When the air screw is turned fully home the engine should stumble & conk out, as yours never , = means the pilot jet is too small, , what like is the spark plug colour AFTER a run ? Link to comment Share on other sites More sharing options...
Mark Halford Posted June 22, 2016 Author Share Posted June 22, 2016 drewpy. Ok I'll keep the carb, I think I'm running a 76 jet in there atm what size jets you recommend I buy? blackhat250. Imnot too sure about the plug I can't get it to run well enough to take it for a run lol is the pilot jet the main jet? thanks Link to comment Share on other sites More sharing options...
Moderator drewpy Posted June 22, 2016 Moderator Share Posted June 22, 2016 3 hours ago, Mark Halford said: drewpy. Ok I'll keep the carb, I think I'm running a 76 jet in there atm what size jets you recommend I buy? blackhat250. Imnot too sure about the plug I can't get it to run well enough to take it for a run lol is the pilot jet the main jet? thanks buy a jet kit, only £14 from SIP. individual ones are £4 each with postage for example http://www.sip-scootershop.com/en/products/jetting+kit+dellorto+7598+_40270200 Link to comment Share on other sites More sharing options...
Mark Halford Posted June 22, 2016 Author Share Posted June 22, 2016 drewpy. ok mate cheers I'll order that kit asap. it will fit aerox yeah? and what is the pilot jet? Link to comment Share on other sites More sharing options...
Moderator drewpy Posted June 22, 2016 Moderator Share Posted June 22, 2016 26 minutes ago, Mark Halford said: drewpy. ok mate cheers I'll order that kit asap. it will fit aerox yeah? and what is the pilot jet? whoa, hold on, that's an example. check what carb you have first pilots are for low end running, you can adjust those and when you can't adjust it anymore, then try a new pilot. Link to comment Share on other sites More sharing options...
Mark Halford Posted June 22, 2016 Author Share Posted June 22, 2016 ok I tried measuring it and got 24mm that sound right? I'm not sure what I'm doing with the pilot though lol shall I send u a pic of the carb? Link to comment Share on other sites More sharing options...
Mark Halford Posted June 22, 2016 Author Share Posted June 22, 2016 drewpy. I'm not to sure what I'm measuring on the carb to determine the size any ideas? Link to comment Share on other sites More sharing options...
Moderator drewpy Posted June 22, 2016 Moderator Share Posted June 22, 2016 I suggest you get a manual for the bike as they will show schematics. I have no experience of your bike. you need to strip the carb and determine the thread size and height of the carb so you can gewt the correct mains Link to comment Share on other sites More sharing options...
Mark Halford Posted June 22, 2016 Author Share Posted June 22, 2016 ok thanks for your help I'll buy a manual and a set of jets as see how I get on Link to comment Share on other sites More sharing options...
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