skikman Posted February 19, 2010 Posted February 19, 2010 hi i have a 4stroke 2cylinder lifan lf125-a.it starts on `1cylinder i think because only 1 exaust smokes[the other has air coming out tho]it idles but wont take trottle.if you let it sit for a while and it will idle to fast and rev ok.mess around choke and trottle on and off and it wil;l come back to idle better.take it for a spin and it will go on and off cylinder[remember i think]and the odd backfire,getting better as you go,but stop for a while and you are back to square 1.thought it was a fuel problem at first and cleaned carbs,filters,fuel lines ect 3 times now.can anyone shed any light on this one? Quote
scrowe Posted February 19, 2010 Posted February 19, 2010 havo you looked at the sparkplug and cap? Quote
skikman Posted February 19, 2010 Author Posted February 19, 2010 havo you looked at the sparkplug and cap?plugs not long new and caps and leads look ok but ill check in the dark and see if there is any sparks where there shouldnt be Quote
Grumpy Old Git Posted February 19, 2010 Posted February 19, 2010 Auto advance?Poor compression in one cylinder?Blocked Air Filter?Are you sure both carb throttle needles are set the same?Idle jets set the same?Throttle linkage to both carbs set correctly?Choke linkage to both carbs set correctly?Excessive carbon deposits in one cylinder?Good Luck Quote
Guest Posted February 19, 2010 Posted February 19, 2010 1st issue, the lifan lf125 is a single cylinderhttp://www.lifan.com/en/product_list.asp?parentid=8406&id=860looks like they do a twin but not showing on the list of models.. could be you have a stuck/or bent valve, Quote
skikman Posted February 19, 2010 Author Posted February 19, 2010 Auto advance? everything was ok beforePoor compression in one cylinder?Blocked Air Filter?Are you sure both carb throttle needles are set the same?Idle jets set the same?Throttle linkage to both carbs set correctly?Choke linkage to both carbs set correctly?Excessive carbon deposits in one cylinder?Good Luck Quote
skikman Posted February 20, 2010 Author Posted February 20, 2010 1st issue, the lifan lf125 is a single cylinderhttp://www.lifan.com/en/product_list.asp?parentid=8406&id=860looks like they do a twin but not showing on the list of models.. could be you have a stuck/or bent valve,this is it http://www.lifan.com/en/product_list.as ... 411&id=937 Quote
skikman Posted February 20, 2010 Author Posted February 20, 2010 havo you looked at the sparkplug and cap? ive just started the bike in the dark and there is a sparking coming from the lead of the suspect cylinder.the lead and the coil seem to be all in one.if i just tape the lead up will that cure it or will i need a new lead and coil bear in mind anything is hard to get for this f**king bike,plus im skint Quote
skikman Posted February 21, 2010 Author Posted February 21, 2010 Got any insulation tape? -Jvrtryed that.better but not great.there is one for a lifan 125 cheap on ebay. it looks the same as mine i have two. but it is for a single cylinder.will it do? Quote
Guest Posted February 21, 2010 Posted February 21, 2010 Got any insulation tape? -Jvrtryed that.better but not great.there is one for a lifan 125 cheap on ebay. it looks the same as mine i have two. but it is for a single cylinder.will it do?if you have two coils then yes it will do. Quote
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