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General Category >> Rubber Side Down! >> Need help - how do i know if i need to rejet carb?
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Message started by realdeal on 09/30/05 at 05:36:16

Title: Need help - how do i know if i need to rejet carb?
Post by realdeal on 09/30/05 at 05:36:16

So, i installed the Screaming Eagle last night. First, let me say that it sounds awesome! A million times better than stock. deep and throaty sounds.

But, i digress. I have an '87 that runs a little rich all the time. when i look at the spark plug, it's more black than tan or grey.

After i put the SE on, i ran it for a bit. No serious backfiring issues. Only backfires when i let push it high in the RPM range in 2nd or 3rd gear, and then let the throttle go quickly. Basically exactly the same as the stock exhaust (which was it bit rusted out)

If i slow down slowly, it doesn't backfire.

So, my question is, do i really need to rejet it?

Thanks!
-Neil

Title: Re: Need help - how do i know if i need to rejet c
Post by vroom1776 on 09/30/05 at 08:46:45

you need to do a plug chop. A real plug chop.

Plug chop:

1. Install new plug or clean old plug with sandblaster. Make sure it is gapped correctly.
2. Start bike. Allow it to warm up.
3. Smoke a cigarette while waitng for it to warm up.
4. Go for a highway ride.
5. After 5 to 7 miles in fifth gear (or fourth, for pre '96, I belive; you know who you are ;)) at 30% below redline, KILL the engine and coast to a stop. It is important to KILL the engine WHILE at high RPM. If you keep it running, you will end up with some gas from the midrange jet on the plug and you will get a false reading.
6. Let bike cool down a little.
7. Remove plug and inspect.

Then you can do the same thing for the midrange (pilot) jet, but at 40 mph or so.

Anyone remember what our redline is?

Gazab's "plug door method" in the tech sect. may be helpful for plug chops since otherwise you have to yank off the gas tank too...

Title: Re: Need help - how do i know if i need to rejet c
Post by realdeal on 09/30/05 at 10:33:33

sounds like a great idea. That's exactly what I'm going to do.

Thank you!!!