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rdefonce

YZ spark arrestor suggestions please.:-)

14 posts in this topic

Fellow Yamaha fans,

I've got a '99 YZ400F, with stock exhaust. I've been riding off-road some, so I should get a spark arrestor (for fire prevention, and maybe a little noise reduction!)

Questions: - Is there something that attaches to stock silencer, and if so does it work well?

- If that's not the hot setup, which one would you recommend, that would let me maintain power while running a bit quieter? (preferably one that wouldn't require a boatload of jetting changes!)

Thanks!

Ron DeFonce

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I've been real pleased with how well the Q by FMF has worked on my bike. :applause:

Thanks MotoGoalie, I'll file that under potential candidates!

Did it require much in the way of re-jetting?

Ron

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Thanks MotoGoalie, I'll file that under potential candidates!

Did it require much in the way of re-jetting?

Ron

No, not really. I leaned the pj a tad but I'm at high altitude and that prolly has more effect than the pipe.

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I have a Pro-Moto end-cap on my '04 and it works great, smoothing the power, makes it quieter, and adds no weight.

brian

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I have a Pro-Moto end-cap on my '04 and it works great, smoothing the power, makes it quieter, and adds no weight.

brian

Brian, thanks for the info. That's exactly what I'm looking for.:-)

BTW, we travel to Col. every other year for dirt (or street) biking. I've found that Ouray is a great place to stage out of, since it's got such breath-taking scenery (my wife likes it for jeeping/scenery/shopping) and I go riding.

I've found that in high altitude (between 9k - 13k feet) my bike backfires quite a lot on the downhills . . . hope my slightly larger pilot jet, along with the spark arrestor, helps that a bit.

Ron

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Brian, thanks for the info. That's exactly what I'm looking for.:-)

BTW, we travel to Col. every other year for dirt (or street) biking. I've found that Ouray is a great place to stage out of, since it's got such breath-taking scenery (my wife likes it for jeeping/scenery/shopping) and I go riding.

I've found that in high altitude (between 9k - 13k feet) my bike backfires quite a lot on the downhills . . . hope my slightly larger pilot jet, along with the spark arrestor, helps that a bit.

Ron

A few of us live a half hour away from Ouray. Look at our jetting specs to cure your backfiring problem at high altitude. I can tell you my bike in the sticky above is jetted perfectly for this altitude.

http://www.thumpertalk.com/forum/showthread.php?t=248849

Richer is not the answer :applause:

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A few of us live a half hour away from Ouray. Look at our jetting specs to cure your backfiring problem at high altitude. I can tell you my bike in the sticky above is jetted perfectly for this altitude.

http://www.thumpertalk.com/forum/showthread.php?t=248849

Richer is not the answer :applause:

Pretty cool, living only a half-hour away! . . . you must be in Montrose or nearby?

I reviewed your specs, and I did use the Excel chart the last time I jetted for hi-altitude. My bike was backfiring here (in St. Louis, 500 ft and 75 degrees) almost as bad as hi-altitude. When I went to the one-size-larger pilot (48) the backfiring is mostly gone. (I know that doesn't correlate to high-alt. though, like you said in your post a rich condition can mimic a lean condition.)

One thing's for sure; my 400 won't require the same jets as your 450; curiously the 400 requires generally larger jets than the 450. (Stock jet settings on 450 are smaller than on 400!)

Ron D.

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