Engine cutting out at high rpm By dozer187 (Read 7,866 times)

[dozer187]

Gotcha thx for ur help and patience lol

[Alleyoop]

If the NEW diaphragm came with a needle I would take the needle from the old diaphragm and swap. The needles that come with the aftermarket ones I found are of different size, some thicker some thinner.
And that may be the cause of the mid-range hiccups.

[dozer187]

Yea i just did that, i noticed the new needle was a drop longer ao i put the old one in, now to swap out the main jet, should i go down 1 or 2 sizes?

[Alleyoop]

Why?? it was running just Peachy Keen with the 92 so you said ?

[dozer187]

My post from about 4 hours ago i said the top end surging was back from a rich condition, the 92 was great in cooler and cold weather but not 80 plus degree days

[Alleyoop]

Don't do squat until you try it with the needle swap. You always work from the bottom up last is the 1/4 throttle which is when the main jet really comes in needle fully out and getting all the fuel the jet and needle is allowing due to size.
Alleyoop

[dozer187]

I gave it a test ride after i did the needle swap, runnim rich on top i can smell the fuel its not using

[Alleyoop]

Then put in a 90-91 that should cover cooler and hot temps.

[Alleyoop]

Just remember you do not have Fuel Injection which senses when the air density changes and adjusts the fuel mixture. You will have to settle for a medium where it runs good in hot or cold temps and may only require a minor adjustment of the fuel ratio mixture. But I can tell you this in HOT weather you will loose power all motors do mo matter what you do.