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Trouble with Lifan 125cc engine.

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Hi guys and girls.

I recently brought this.

l_073c880d72e36e9d9f3413f892e6567f.jpg

Which runs a lifan 125cc engine.

This is the story so far

Got bike

Striped all bolts, loctited.

Ran in (riding slowly 2nd-3rd gear, half throttle) 3/4 tank

(short "run in" I know)

afew days later rode harder for about an hour

dumped oil

replaced with mobil extra 4t synthetic technology 10w-40 (though bike shop lable sais semi-synthetic.

this is where the problems start

Had first full on hard ride, took afew beginners with me so they were chomping on the kickstarter abit (softly) just had no experience. ALl was running fine

loaded bike in van and traveled home, unloaded and went to kick over to ride around the back (yes lazy)

The kickstarted started to "slipp" inside the engine, this is hard to explain, it didnt turn the motor over half the time.

Looked at it for a while and clutch started, bike still ran fine.

Researched abit and people said sometimes this happenes and it "may" fix itself.

So afew days later took it out for another ride, when unloaded from van the kickstarter was grabbing and fored 3rd kick. ROde for 3-4 min untill stall.

Kicker again slipping (this is not on the spline, it is inside)

Push/clutch started next 2 stalles (wasnt that easy to start)

Had a hard ride for about 30-40min without stopping, when resting left ideling.

Next time I stopped it was gripping again, and did for the rest of the ride where i stopped and started atleast 6-7 times.

Once again loaded up, went home (bike slightly cooling, only 5-10min trip) and again kicker slipping.

Next time I went to ride (today) neither kick starting or clutch starting worked.

We have come to the conclustion (without taking anything off) that the oil may be the problem, because it is to thick the clutch is slipping which wont allow a clutc start, and we are guessing (can anyone conferm?) that the kickstart is somehow connected to the clutch which is giving it the freeplay.

If so the oil heated up on that ride (and thinned) which is why it was kicking???

There is spark

Also I ahve heard that there is some type of cog behind the kickstarter with a split pin, if that comes off there is no connection to the kickstarter (the kickstarter os not completely free moving, it is still realativly the same pressure (maybe abit less) to compress but doesnt have the clunk clunk of the engine turning over.

Any help appreciated, thanks for listening to me ramble

-Ben

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Could be a couple of things lets start with an easy one

1) adjust your clutch down near the motor on the cable adjustment (not all the slack at the Clutch lever).

2) get rid of the synthetic oil (makes the chinese clutches slip) and use Non synthetic oil....IMO

3) worse case senario...broken kickstart idler gear

Dont let any idiots ride your bike

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"Dont let any idiots ride your bike" classic point for all of your bikes. 👍

I didn't know synthetic oil made you clutch slip. Everyone always told me to run non-synthetic and I do but thats quite interesting.

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Take the cover off it sounds like your nut under the clutch springs has came loose.

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should have stuck with a honda or yamaha, or suzuki. Truely, i heard nothing good about those lifan bikes. I know there is alot of replacement parts forsale on ebay. if that helps.

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should have stuck with a honda or yamaha, or suzuki. Truely, i heard nothing good about those lifan bikes. I know there is alot of replacement parts forsale on ebay. if that helps.

Look at the thread from a frustrated Yamaha owner.

Honestly, you have never ridden a Lifan have you? I have two and they have been very reliable.

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should have stuck with a honda or yamaha, or suzuki. Truely, i heard nothing good about those lifan bikes. I know there is alot of replacement parts forsale on ebay. if that helps.

Good answer...but this is a Pit bike forum where 98% of the talk is on chinese bikes pedal the should have would have could have in the Jap forum...

Try the clutch adjustment as I discribed above

remember adjust the slack at the motor (not the lever)

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It's al 4 up.

Its not the clutch slack, we have tried everything simple like that

And yes the lifan is a good engine when its running, things like this just happen.

I am in the process now of taking the cover off, have already drained oil. Will take case off and look at kickstart connections

IMO I think we have struck 2 problems at once

1, thsomething inside the engine has come loose so lost kickstarter

2. The new oil has forced the clutch to start slipping.

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Ok We took the RH side cover of and nothing was visibly loose. We have come to the conclusion that it was the oil that was making the clutch slip.

Because the kickstarter transfers its power threw the clutch (am I right) because it was slipping means no start. If it was a start in any gear bike it would be a differt story.

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Look at the thread from a frustrated Yamaha owner.

Honestly, you have never ridden a Lifan have you? I have two and they have been very reliable.

My friend has one, i rode it a couple of times and I didnt care for it. But 6 months after, it fell all apart. The Muffler fell off, the header broke there it entered the cyclinder head. The kickstart kept on creeping down. The clutch lever was all messed up. And he even rode like a girl. Yeah but if it works for you. Great!

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The all Up Lifans are a huge inprovement over the 1D-4up

But again running synthetic oil is not good to use in a Chineses motor

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