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General Category >> Rubber Side Down! >> Backfire on upshift
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Message started by airframer509 on 04/15/05 at 17:15:20

Title: Backfire on upshift
Post by airframer509 on 04/15/05 at 17:15:20

I removed the spacer from the carb, but my bike still backfires on an upshift, very rarely on downshift now or it is a low rumble at least, but a loud pop whenever you shift up to next gear.

What next?

eric

95 Savage

Title: Re: Backfire on upshift
Post by sluggo on 04/15/05 at 18:22:17

removed the whole spacer? should have only trimmed it down to half size.

backfires are normal in a big single. you will never fully get rid of them. i've ridden thumpers my whole life and i like em they announce your presense.

read post titled white spacer mod in technical section for more information on the subject.

Title: Re: Backfire on upshift
Post by Bluejeanz on 04/15/05 at 19:48:22

I kinda like the backfire too. I can do it on demand and avoid it when I want to (except sometimes when I park her, she farts...).

I think it's a cool feature of owning a Thumper.

Title: Re: Backfire on upshift
Post by Greg_650 on 04/16/05 at 07:06:09

airframer509 wrote:

Part of it might be your shifting technique that causes the backfires on upshift, very rarely on downshift....throttle position and RPMs...

Either way, it is happening when you close the throttle. You said "pop" which could be different from a backfire. Depending on the interpretation, I am wondering if you have changed the exhaust. If so, have you also changed the main jet?

Title: Re: Backfire on upshift
Post by shawn_b on 04/17/05 at 08:17:58

Today i was riding by an hd shop she let out a big one :P ::)
i love my bike 8)

shawn

Title: Re: Backfire on upshift
Post by WD on 04/18/05 at 02:38:18

Try easing off the throttle just a touch when you shift. If you let off a good bit, shift, and then whack the throttle, it's gonna backfire. I shift without the clutch for 2-3, 3-4, 4-5, and for 5-4, 4-3, 3-2, 2-N. No backfires, but if I miss the shift point by a couple hundred RPMs, there's gonna be a 98 parted out here... Takes a lot of practice, but, I find it smoother on me and the bike than using the clutch all the time.
-WD