david jones Posted on May 12, 2014

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What causes pipes to turn red and rpms to go above 3000 after about a minute of idle

Motor starts up up fine then rpms go up and two center header pipes turn red.....any thoughts would be greatly appreciated

1 Answer

paul

Yamaha Master 1,190 Answers
Posted on May 12, 2014

paul

Yamaha Master

Joined: Dec 02, 2013

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Weak mixture ! all 4 red ? carb version , or injection ? clean fuel system ? was it running ok b4 ?

Testimonial: "just center two pipes glowing red and its fuel injected....was running fine b4 but has sat up for a while"

3 more comments
paul May 12, 2014

swop the injecters over and see if problem moves ! injecters do varnish over , soak in injecter cleaner mite solve or injecters need replacing ! G , L ...
david jones May 12, 2014

thanx for the help i will give it a try and let you know
david jones May 19, 2014

it was the injectors thanx for the help it was the injectors thanx for the help
paul May 19, 2014

thanks for the reply and have fun ! thanks for the reply and have fun !
paul May 19, 2014

thanks for replyin ! and have fun ! Paul

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hey David, this one is a very interesting read:
http://www.yfzcentral.com/forum/32-yfz-powertrain/50091-why-my-new-exhaust-turning-cherry-red.html

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