426 high rpm sputter


8 replies to this topic
  • shrekmoose

Posted October 25, 2009 - 04:08 PM

#1

I just recently developed a high rpm sputter on my 2001 426. bike sat for about a month (had a broke subframe bolt to fix) and when I fixed it and started it now has this sputter. I noticed when I was doing my subframe that my exhaust band clamp was loose and exhaust could just be pulled off by hand. So I tightened it all back up and while it has got rid of my popping on decel, it makes it to where when i open it up with the rpms up it misses and kinda sputters. Any ideas what this may be? maybe jetting is off now?

  • phart2005

Posted October 26, 2009 - 04:21 PM

#2

Hows the spark plug look?

  • shrekmoose

Posted October 27, 2009 - 12:46 PM

#3

good question ill look when I get home.

  • Lor

Posted October 27, 2009 - 07:09 PM

#4

Old gas???

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  • DrThumper

Posted October 28, 2009 - 01:42 PM

#5

Main jet clogged, lacquered up from non-use.

  • shrekmoose

Posted October 29, 2009 - 02:50 PM

#6

so in other words imma have to tear into my carb no matter what pretty much. I am hoping its in the carb, i have lost alot of compression until it warms up. I assume my rings are not sealing well. So looks like there is a top end in the near future. Would that have anything to do with the miss?

  • grayracer513

Posted October 29, 2009 - 03:42 PM

#7

... i have lost alot of compression until it warms up.

That is a symptom of tight intake valves.

  • shrekmoose

Posted November 01, 2009 - 12:31 PM

#8

would that cause the sputter, or is that more than likely just cause its an older bike and never had the valves adjusted before?

  • grayracer513

Posted November 01, 2009 - 04:01 PM

#9

would that cause the sputter, or is that more than likely just cause its an older bike and never had the valves adjusted before?

Dirty carb, bad plug.





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