knocking under acceleration

riceboy131 · 07-30-2021, 09:42 PM

my 2005 gz250 sounds like it is knocking under heavy accel i cant pinpoint the sound since i have to be riding it. its kind of a hard high pitched thud and sounds like pre detonation. i dont know how or if you can adjust the timing so i cant check if it is infact pre det. there is also a loss of power at about 1.500 rpm if anybody knows what thats about
the bike only has 4k miles on it

Vegas Street Rider · 07-31-2021, 12:43 PM

I believe there is a thread on here on how to check and set the timing. Use the search feature.

You may need a valve adjustment if that isn't the problem. There is also a how to here for that. They recommend that you check/adjust the valves every 3k miles, but I have only done it twice and have 24K on my 09 GZ.

07-30-2021, 09:42 PM	#1
riceboy131 Junior Member Join Date: Jul 2021 Posts: 2	knocking under acceleration my 2005 gz250 sounds like it is knocking under heavy accel i cant pinpoint the sound since i have to be riding it. its kind of a hard high pitched thud and sounds like pre detonation. i dont know how or if you can adjust the timing so i cant check if it is infact pre det. there is also a loss of power at about 1.500 rpm if anybody knows what thats about the bike only has 4k miles on it Login or Register to Remove Ads Last edited by riceboy131; 07-30-2021 at 09:43 PM. Reason: for got mileage
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07-31-2021, 12:43 PM	#2
Vegas Street Rider Senior Member Join Date: May 2015 Location: Henderson, NV Posts: 1,108	I believe there is a thread on here on how to check and set the timing. Use the search feature. You may need a valve adjustment if that isn't the problem. There is also a how to here for that. They recommend that you check/adjust the valves every 3k miles, but I have only done it twice and have 24K on my 09 GZ. Last edited by Vegas Street Rider; 07-31-2021 at 12:46 PM.
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