Jinlun Owners forum

Visitor Forum :: rear shocks

Sat, 04 Feb 2012 10:18:30 +0000

I think my sons jinny could do with some new rear shocks, he's a big lad and they seem to sink a lot even on the hardest setting. He doesn't want the pain of taking one off just to size the holes or length to have to put them back on again get new new ones and then do it all again, so does any one know the sizes I need to source new ones or what other bike shocks will fit.

Visitor Forum :: Re: Engine pulling at high revs

Wed, 18 Jan 2012 18:36:04 +0000

By: crezz

Hi all,

Thanks again for all the great advice. As promised, here's an update on my "pulling problem"
Checked out the coils and HT leads over the weekend and found the following:
Both coils were hanging in mid-air under the tank! Both rubber mountings had perished and split so were no longer supporting the coils at all, I checked the connections (not bad) and cable tied them for now.
I then had a good look at the HT leads. Both have a generally worn and weathered look to them, I guess 5-6 years is getting on a bit. They didn't "grab" the spark plug that convincingly so I worked the springs a little and improved things.
I checked the plugs and both looked ok, good colour etc
I checked the sparks on both and they seemed ok.

Now here's the thing, the bike is now running a whole lot better! The engine sounds smoother and the power is fairly consistent up to around 8000 revs.
It is still not quite right but hey. So the problem would seem to be either coil or HT leads.
Over the next couple of months I'll replace the components and hope to ride trouble free into the spring.

All the best,

Crezz

Visitor Forum :: Re: Engine pulling at high revs

Wed, 11 Jan 2012 01:57:40 +0000

By: kawasakigpz900r

Quote by: crezz[pI'm leaning towards an electrical problem at high load, I'll check all the ignition and coil connections. What about the CDI? Can they break down under load?
[/p]

CDI's tend to work, or not.

They don't carry a load, so don't go faulty like coils.

Have you a good spark on both sides?

If it's not air / fuel flow, then I'd look at coils. Someone on here maybe close to you and let you try their coils, at least that way you can eliminate them.

Visitor Forum :: Re: Engine pulling at high revs

Tue, 10 Jan 2012 14:26:45 +0000

By: crezz

Hi all,

Thanks everyone for taking the time to post regarding my "pulling problem".
Just to clarify, the bike pulls (holds back) around the 6000 rev range in any gear, feeling as if i'm grabbing and releasing the brakes.

Perhaps if I go back to the point when the problem started, it may give some clues?
Late last summer I had the bike up on a stand to give the chain some lube and adjust it as I thought it was a bit slack.
Following day, the problem started.
I thought that I'd over-tightened the chain, let it off a little, but no joy.

After that I tried new plugs, oil change checked HT lead connections but no change.
The bike had a K&N filter fitted from the previous owner, I removed that about a year ago, no performance change at that time, all good.
Since the problem started, I,ve fitted a standard filter pad in to the air box (missing after previous K&N Mod) but again, no change.

Regarding the valve, rings, carb adjustment ideas, wouldn't they cause a gradual problem over time and effect general engine performance? Likewise the air and fuel filters?

I'm leaning towards an electrical problem at high load, I'll check all the ignition and coil connections. What about the CDI? Can they break down under load?

I'm no mechanic folks, and any advice would be much appreciated.
I'll post an update after I've tried a few more things this weekend.

Cheers Crezz

Visitor Forum :: Re: Engine pulling at high revs

Tue, 10 Jan 2012 13:21:53 +0000

By: Lardarzz

not sure what your problem is if i read it right at 6000rpm it pulls better than at lower revs ?

if i read correctly then i am not surprised i have said for long time these bikes ride best at top of rev band and that is why best thing i bought for mine was a rev counter as i was riding mine to gently at start they have always been like this i not sure why

Visitor Forum :: Re: Engine pulling at high revs

Tue, 10 Jan 2012 09:47:23 +0000

By: kirriepete

As others have said, airflow is a favourite - imagine trying to run flat out with a sock stuffed in your mouth .....

Fuel starvation? Check that the tank filter's not clogged up and your float heights are correct. It won't do any harm to check the carbs are balanced, although I doubt this is the problem.

How are your valve clearances - if they're a bit tight you may not be getting enough go-juice in at peak revs (should check valves before balancing carbs anyway).

Other possibilities include HT circuit breaking down at peak loads - leads, coils & plug caps - check all connections are clean & corrosion-free.

That little lot should keep you going for a while ....

Visitor Forum :: Re: fuel filter

Mon, 09 Jan 2012 22:28:02 +0000

By: Steve125

Shame you live so far away mate. I'd come and help you. Carbs are fairly straight forward to clean though.

Visitor Forum :: Re: Engine pulling at high revs

Mon, 09 Jan 2012 22:23:42 +0000

By: Steve125

Check air filter, although it doesn't appear to be a problem if the bike is still idling ok, as an imbalance in fuel to air intake would result in poor idling.

Have you checked that it's firing on both cylinders? Next thing would be to do a compression test. I've no idea what the pressure is meant to be on these bikes, but maybe your piston rings needs changing. It is 6 years old after all...

Visitor Forum :: Re: Engine pulling at high revs

Mon, 09 Jan 2012 21:52:58 +0000

By: JacktheBeard

Could be an air filter issue, what kind do you use? I experimented with one K&N style a while back and it was fine through the gears but struggled to get above 40. Two has always worked much better for me.

Visitor Forum :: Engine pulling at high revs

Mon, 09 Jan 2012 21:15:40 +0000

By: crezz

Hi all,
Can anybody shed some light on my engine pulling problem?
I have a 125-11 2006 that has been struggling at around 6000 revs. She performs fine through the rev range until she hits 6000 revs at which she pulls noticably.
I've changed the oil, plugs and the HT leads appear in good condition.
Anyone experienced this or got any ideas?

Cheers in advance, Crezz