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  #21  
Old 07-21-2016, 08:31 PM
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Default Timing

     

I have already tried retarding and advancing the timing by turning the stator plate as far as the stock notches allow. I never noticed any significant improvement. I believe this is all the control I have over timing. Is there other adjustments for timing generally?
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  #22  
Old 07-21-2016, 08:42 PM
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You need a service manual so that you have the correct timing spec's and then set it to those spec's. Just turning the stator plate will not get you the correct timing.
When the bike is doing all that blubbering, is it putting a lot of smoke out the exhaust?
Have you done a compression test or a leak test?
Are the exhaust valves operating correctly?
My feeling is the problem is still in the stator, but I have to ask the other questions too.
Are you 100% sure the jets in the carb are spotless clean?

Paw Paw
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  #23  
Old 07-21-2016, 08:55 PM
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Default Timing

Okay I will read through my owners manual then to understand it and give that a shot.

When it is idling it does not smoke alot, but yes when it is blubbering it will smoke alot and it will backfire (not sure if this is the correct term) and alot of smoke will come out then.

I did a compression test awhile ago and remember it being fine, but for completeness I'll do it again. I have never done a leak test.

I will have to look into the exhaust valves more; I do not know much about them. Is there an easy way to check?

I have not been through the carb. That was my next step, since I've been spending so much time on electrical and not coming up with anything. Which Jet would I look into though? It seems to happen every where except idle, so wouldn't pilot and main need to be clogged then?


Thanks again for all the time you've put into this to help me.
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  #24  
Old 07-22-2016, 11:13 AM
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You may have nothing more that a flooded crank cavity. This will happen if idled too long as these engines are meant to rev a lot and idle very little. That would also explain the "backfire" when you try to rev it.
This condition can also be found with bikes that have a fautly carb float sealing or if it is set too high.

Paw Paw
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  #25  
Old 08-09-2016, 12:41 PM
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Default Update: progress yet no progress.

So I have been spending some more time on this and I went through the carb and did a good clean and checked the jets. Everything looks good in there.

When I cleaned the carb I also used a syringe and hose to check the flooded cavity theory. I was able to stick the hose down under the piston into the crankcase. I was not able to suck anything up and the hose was clean.

I borrowed a timing light from someone and found some interesting stuff. First off I marked TDC and it seems it is firing after TDC instead of before like my manual says (assuming my understanding of the flywheel and piston movement is correct). Also when being revved up past idle it looks like every other fire is 45 degrees or so before TDC, which seems very odd.

Any thoughts on this?

Side note: If it is firing BEFORE TDC then the timing is advanced right?
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  #26  
Old 08-09-2016, 03:01 PM
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Your manual should state the timing in MM before TDC.
Remember you ignition fires every revolution and should do so at the same time.
The CDI controls the timing as the rpm rise. It get it's info from the stator.

Paw Paw
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  #27  
Old 08-13-2016, 06:03 PM
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I can only find it in degrees ( 8 degrees BTDC @12000 rpm), but if it's firing ATDC could that be the stator's fault somehow. I've tried swapping some wires to see if something is wired backwards, but nothing changes and I have double-triple-quadruple checked that I wired it according to the company's specifications.

What else could possibly cause it to fire ATDC? Just the CDI being faulty?

Also the backfiring I mentioned is coming out of the exhaust valve breather hose. Could this also be caused by the timing being off?
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  #28  
Old 08-15-2016, 03:06 PM
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Until you get your timing to the OEM spec's you will not get any closer to solving the issue at hand. It could be an issue with the aftermarket stator. It could be in the placement of the trigger coil on the stator.
You may not be observing the timing correctly as well or the timing light is faulty. You stated that the timing should be at 8 degrees BTDC, but you state it is firing ATDC and also firing inconsistently.

Paw Paw
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  #29  
Old 04-14-2017, 10:53 PM
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Default Timing

Do you have any suggestions on further testing the timing or adjusting it?

This bike only gives you the option to turn the stator plate a couple degrees forward or backwards, so I can't get the timing in spec due to lack of control of it.
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