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first time owning shee help


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What size domes, how much compression, and what octane gas are you running?

Plugs backing out are a tell tale sign of detonation....and the motor is trying to tell you something.

stop running that motor until you figure it out...or you're gonna have a lot bigger repair bill than just tightening spark plugs.

 

 

And if the guy told you to just tighten them when the motor is cold, find a new builder/mechanic...he has no clue.

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Think or know? At this point, you must get a quality compression tester and get cranking PSI...

If you're lean...it will really show in 6th...

 

Are you holding it WOT for a long period of time in 6th gear? You could be running the carbs out of fuel, as well...

 

It shouldn't back out plugs, regardless....in any gear. it's either timing, jetting, compression...or the wrong octane..or a combo of any of those.

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That's all fine, you're missing the point.

You need to check compression first before you go any further.

Regardless of what you plan to do on the carb setup...

And 38mm single carb is too big for your motor....with a mild port.

 

Check the compression first...using a quality gauge.

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I think you need a compression tester first.

Then...answer the rest of the questions...

 

1. Do you have the timing advanced?

2. What elevation and temps do you ride at?

3. Are you holding it open for a long time in 6th gear (Wide Open Throttle, or WOT for short)?

 

 

All of these play a part. Your jetting and octane could be fine...however, if you're holding it WOT for a long period of time, it could be running the float bowls dry, which will lean it out...and cause detonation (and the plugs to back out)

 

Several factors contribute to plugs backing out from detonation.

 

You'll need to answer ALL of the questions, as well as get a GOOD compression tester with the same reach as the spark plug (threaded end that goes into the cylinder)

 

Also...you MUST do the compression test correctly. Warm the bike up, remove both plugs. (Make sure the ignition is turned off)

Thread the compression tester in, hold the throttle wide open...and keep kicking. Not 1 kick, or 5 kicks, or 10 kicks.

Keep kicking until the gauge no longer goes up. Often, this can take 15 kicks, 20 kicks or more. The first two or three kicks the gauge will jump pretty good. Then, it'll barely go up a few PSI at a time. It is CRITICAL you keep kicking until that needle doesn't move at all anymore.

 

I'm basically getting at don't just "kick it 10 or 15 times" and call it good. Keep on kicking until it doesn't move on the gauge, however many kicks that takes.

 

Then, repeat for the other side.

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