04 grizzly 660 wont rev up - Grizzly Riders - Yamaha Grizzly ATV Forum

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post #1 of 1 (permalink) Old 07-30-2020, 11:22 PM Thread Starter
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04 grizzly 660 wont rev up

hello i have a 04 grizzly 660 that dies when you give it gas ran good for 4 months and then would not run with out choke started spitting and back fireing thinking it was carb so pulled carb and dipped with new quad boss kit installed all new jets now it will start and idle good with and without choke but as soon as you touch throttle it dies. I put in new plug old one was dark black looked rich took compression test has 105. been through carb three times all passages blow clear any help would be great thank you
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