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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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  #41  
Old 11-17-2018, 09:39 AM
Undertow Undertow is offline
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Quote:
Originally Posted by Neil E. View Post
If the ignition timing is too far advanced you could get a "kick back" happening. This could happen by kick or estart. There is an oval washer that locates the stator plate in it's mounting slots. If this washer is missing, the timing could be way off.

The only way to find out is to remove the cover and pull the flywheel (a special puller is required).
Well, turns out the Neil E. had a point. The washer /cotter pin what ever you call it was nicely cutted in half and flywheel had moved a bit. This in turn makes the ignition to have too much "forward" timing leading to a nice kick back.

Have no idea how this could have happened but now a lot of things make sense; the kick back, rough running, easy stalling etc.

But the starting issue has to be of different origin, since the engine doesn't turn at all

Anyway, thank's for the help so far, the battle continues...
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  #42  
Old 11-17-2018, 09:54 AM
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Davehuge Davehuge is offline
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Well that's great news, a big step forward and explains a lot!

That's the 'Woodruff Key' that has sheared.

The reason it's sheared is probably because the flywheel was not pushed securely onto the taper of the crankshaft, maybe the flywheel nut wasn't tightened properly? Maybe dirt/debris on the taper not allowing it to seat properly? Maybe damage to the taper on the crankshaft or taper on the flywheel?

Before you fit a new Woodruff Key, carefully inspect both tapers, run your fingers around both tapers feeling for any damage or 'high spots'.

All the best, Dave.
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  #43  
Old 11-17-2018, 10:09 AM
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Davehuge Davehuge is offline
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Quote:
Originally Posted by Undertow View Post
But the starting issue has to be of different origin, since the engine doesn't turn at all

Anyway, thank's for the help so far, the battle continues...
So where are you at now, you have fitted a new Woodruff Key but the bike won't start?
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  #44  
Old 11-17-2018, 10:13 AM
Undertow Undertow is offline
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No new woodruff key yet. Just today got the flywheel pulled.

And the starting issues are based on the starter not turning the engine over. This is probably due to the weak batter (new 240 cca battery coming as a guarantee) and high compression.
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  #45  
Old 11-17-2018, 10:15 AM
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Davehuge Davehuge is offline
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OK, see what happens with new Woodruff Key and new battery.

Good luck! Dave.
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  #46  
Old 11-17-2018, 12:13 PM
Neil E. Neil E. is offline
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Let's get the credits organized. It was Jakobi who called out the flywheel keyway. This will have a significant influence on ignition timing. I was mentioning the stator plate location relative to the oval washer stamped with "T".

If the oval washer is modified, the stator plate can be advanced or retarded. Since the trigger (impulse coil) is mounted to the plate, any movement of the plate also throws off the timing.
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  #47  
Old 11-17-2018, 12:21 PM
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Davehuge Davehuge is offline
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Haha, well I wasn't going to say anything, but seeing as you mentioned credits, check post #10...

Quote:
Originally Posted by Davehuge View Post
I guess there is a woodruff key in the end of the crankshaft to locate the flywheel and fix the ignition timing, could the key have sheared or be missing, allowing the timing to slip?
I guess if I pointed my finger at enough things, then I would be correct on at least one! There's method in my madness!

Anyway, the important thing is you've found the problem...I hope your dealer/GasGas will be paying for the flywheel puller!

Hope you're able to get out and enjoy your new bike very soon, it's a real shame you've had this problem, you've been very unlucky. But...look on the bright side...I guess you've learn't a lot about your engine!
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  #48  
Old 11-17-2018, 02:39 PM
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Jakobi Jakobi is offline
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Hahah well done Dave
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  #49  
Old 11-17-2018, 04:53 PM
Undertow Undertow is offline
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Well, here I stand corrected

But as Dave said, I've had a nice learning curve with GasGas maintenance
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  #50  
Old 12-03-2018, 09:26 AM
Chris_tian Chris_tian is offline
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Yesterday i broke my 2nd kickstarter at the first kick...

Can one tell me wich Yamaha kistarter fit at 2018 EC?
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