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Ignition issue

Started by smokestack, May 20, 2016, 06:06:01 PM

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smokestack

Buddha's shipping me some jets today, excited to get this back on the road. Stevo, I took your advice and asked for smaller jets, he suggested I just go to your setup, 20/60/132.5. I might have an air leak somewhere that's leaning it up more than normal anyway.

That's good to know about the parts 'fiche jdoorn. I was trying to piece together old forum posts and pictures, also confusing since the earlier models only have the two jets.

smokestack

#41
This bike is making me work for it.

I've rejetted twice now:

Stock: 17.5/60/130 - very lean, white plugs
First rejet: 20/62.5/132.5 - can't rev past ~5k RPM or get over 30mph, engine just bogs down
Second rejet: 20/60/130 - no noticeable difference, still bogs down at 1/3-1/2 throttle, dies on cold start with full choke but runs fine cold without the choke. Before, it would need full choke for 3-5 minutes or it would die.

I can see the choke slide on the carbs closing all the way so I don't think the cable got over tensioned (I didn't adjust it anyway). The pilot air screws are out three turns (more turns = more rich?). Float height is about 14mm.

All I did was switch out the jets and adjust the pilot air screws.

Would a small step up in the jet size really affect the mixture that much? Is there something else I could have botched?

I'm just remembering that I took off the Throttle Position Sensor the first time and just reattached it when I was done. Trying to search around on how I could have screwed that up.

smokestack

Yeah, I bet the TPS was mounted incorrectly. Had no idea the alignment mattered.

smokestack

#43
If I completely disconnect the TPS, it runs the same. When I hold the throttle all the way open though, it blips to 3k RPM every second and returns to idle. Cool.

smokestack

Adjusted the TPS per the Haynes manual and still getting the same thing:

Dies cold with full choke, idles fine without choke but can't rev past 6k RPM or it dies.

20/60/130, 3 turns out on the screws. Started happening after swapping in a 20 pilot jet (replacing a 17.5 jet)

Can't believe the new pilot would rich it out that much... I guess I'll fiddle with the air screws but is there anything else I could have done wrong?

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