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  #31  
Old 25-11-2017
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Pygmygod Pygmygod is offline
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Jet sizes haven't been changed?
Make sure those tiny little o-rings are still installed in the carb mixture screw.
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  #32  
Old 25-11-2017
dieseldude dieseldude is offline
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Quote:
Originally Posted by Pygmygod View Post
Jet sizes haven't been changed?
Make sure those tiny little o-rings are still installed in the carb mixture screw.
The o-ring is still in place at the tip but not on the shaft. Would the o-ring on the shaft missing really cause this much of a headache?

The spring at the tip should be putting enough pressure on the end o-ring that I couldn't imagine the larger ring on the shaft would do much besides stopping debris from accumulating in the recess.
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  #33  
Old 25-11-2017
dieseldude dieseldude is offline
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Jet sizes haven't been changed?
Make sure those tiny little o-rings are still installed in the carb mixture screw.
Nothing has changed besides fitting the auto decomp exhaust cam and having the valves shimmed to suit.

It used to be a bastard to start but ran fine.

Now it's generally easy to start but will not run well enough to ride.....
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  #34  
Old 25-11-2017
dieseldude dieseldude is offline
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What about an electrical issue? Could the ignition be breaking down intermittently? Has anyone experienced something like this?
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  #35  
Old 26-11-2017
dieseldude dieseldude is offline
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I've ordered a new coil after watching a series of Youtube videos where a bloke documented similar issues.

I should have it on Wednesday so I'll report back with findings.

Cheers.

Anthony
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  #36  
Old 26-11-2017
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Tom68 Tom68 is offline
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Quote:
Originally Posted by dieseldude View Post
What about an electrical issue? Could the ignition be breaking down intermittently? Has anyone experienced something like this?
Quote:
Originally Posted by dieseldude View Post
I've ordered a new coil after watching a series of Youtube videos where a bloke documented similar issues.

I should have it on Wednesday so I'll report back with findings.

Cheers.

Anthony
Seems more likely it's air fuel ratio, if you're getting it warm on the choke and it stalls when you take the choke off that sounds like a pilot jet issue or air leak between the carby and the head.

Lots more to the ignition than just the coil, Yamaha spec test is to see if it'll jump a 6mm gap.

EDIT....you do have a manual ?
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  #37  
Old 26-11-2017
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Pygmygod Pygmygod is offline
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Full workshop manuals are free to download at yamaha's webpage if you don't have a copy.
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  #38  
Old 27-11-2017
peterp peterp is offline
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1 don't open another can of worms and touch electrics
2 put carby back to the way it was set originally ( to close that can of worms also)
3 put your old cam in and check your valve clearances are right and you might be pleasantly surprised to see it start first or second kick and run properly ( they are hard to start with very little to no clearance which was your original situation )
The odd ball clicking I expect is your decomp cam being a turd.


If it runs correctly with your old cam then look at the new cam and sort out why the decomp on it isn't working properly .
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  #39  
Old 29-11-2017
dieseldude dieseldude is offline
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The new coil turned up today so will fit that tomorrow afternoon. It should only be a 5 minute job.

Cheers
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  #40  
Old 01-12-2017
dieseldude dieseldude is offline
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The new coil turned up today so will fit that tomorrow afternoon. It should only be a 5 minute job.

Cheers
It should only be a 5 minute job when they send the correct part..........

The coil that was sent was far too small.
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