gunk inside intake plenum? - Road Star Warrior Forum : Yamaha Star Warrior Forums

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Old 11-06-2012, 11:08 AM   #1 (permalink)
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Default gunk inside intake plenum?

I was taking off my churchkey vbak to finish up my lcv removal and noticed a really small tear in my filters from where the gas tank has been hittting it over the years (filters are 5 years old). Running my fingers along the inside of the intake plenum and the intake part of the throttle bottles im feelling a grimey black soot. Cant see it sitting on it just looking at it but was visible on my finger when I wiped it with my finger.

I can just use some carb cleaner and a rag to clean this out I assume? Do I need to worry about what might be passed the butterflys on the intake that I cant get at?
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Old 11-06-2012, 11:52 AM   #2 (permalink)
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Yes you can use carb cleaner-although they also make some (probably the same stuff) for intakes on fuel injected vehicles. MAF safe etc. But I'd guess it's probably the same stuff since most of the cans have both listed right on the can.
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Old 11-06-2012, 12:55 PM   #3 (permalink)
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Originally Posted by LeaderDuece View Post
Yes you can use carb cleaner-although they also make some (probably the same stuff) for intakes on fuel injected vehicles. MAF safe etc. But I'd guess it's probably the same stuff since most of the cans have both listed right on the can.
Thanks.....do I need to be concerned with anything on the other side of the butterflys?
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Old 11-06-2012, 01:15 PM   #4 (permalink)
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IMO if the inside of the butterfly looks the same visually then the carb cleaner will do what is needed. Generally the intake beyond the injector is cleaned by gasoline being injected but its obviously hard to see that far inside. It seems very unlikely a hard object was able to enter thru the filter, and the bike's performance would indicate an issue like that.

In case helpful, imo V2 motors like to be fully-warm (even hot) when using spray carb cleaner. And limit how much you spray at one time, when the motor stumbles a bit stop spraying and gently increase throttle to burn it thru. When it smooths out, spray another shot, repeat. Then do the other venturi.

IMO keep the spray inside the intakes don't clean the outside unless something is sticking. If you spray outside then be mindful of anything that might want to be re-lubricated.
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Old 11-06-2012, 01:29 PM   #5 (permalink)
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I used Q-tips and Sea foam to clean what little stuff was there. worked great.
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Old 11-06-2012, 01:46 PM   #6 (permalink)
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Thank you very much guys!
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