Horizons Unlimited - The HUBB

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-   -   XT660r Misfire (https://www.horizonsunlimited.com/hubb/yamaha-tech/xt660r-misfire-82261)

garyc 7 Jun 2015 15:55

XT660r Misfire
 
Hi All

i bought this 2004 xt660r last year with 18k on it, the MOTs seem to back this up, it had been used mainly off road for the last couple of years on forrest tracks and beaches, i just use it for some gentle green laning and local quarry use, i have a couple of issues with it at the moment firstly the rev counter part of the digital dash just reads 0 so i fitted an after market one with a wire that wraps round the HT lead, the engine wont rev past about 3200 rpm it misfires like its hitting a rev limiter and its got the usual hesitancy with the throttle at low revs as well, any ideas would be appreciated.

thanks

Gary

docsherlock 12 Jul 2015 07:00

1. check the valve clearances
2. clean or replace the air filter and spark plug +/- the HT lead

yokesman 12 Jul 2015 15:33

Did this occur before or after the tach addition?

jjrider 12 Jul 2015 20:14

Clean the carbs , check the diaphragm for the slide on the second carb for splits/holes . Make sure all jets are open and not plugged with gunk.





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Jens Eskildsen 17 Jul 2015 21:59

Carbs...? :D

jjrider 18 Jul 2015 01:35

Ya, I'm used to the 600's :oops2:





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