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Discussion Starter #1
valves 023.JPG Im doing my own valve check. My bike 07 F41000R 1,200 miles the intake valves look real crusty is this normal.
 

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Snooky, Good question, My outer intakes looked like this with only 600 (yes 600) miles. Maybe be due to the additives in our gas?

how many miles?
 

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Doesn't look good!
 

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How far do you live from Ferracci? he's in willow grove
 

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Are all the valves like that? 1200miles they should look like new? The valves look like it has carbon up badly for only a 1200 miles.

Have you been lugging the motor, ie low revs due to riding in the wrong gear. You need to give is some revs!!!

You can try using throttle body cleaner to remove the carbon. The bike will initially have a hard time starting up straight after the application of throttle body cleaner.
 

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We get some crappy gas these days.

Add some Yamaha Ring Free to your gas on a regular basis.....same basic thing as Techron.
 

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carbon on the intakes

its oil, either from the valve seals or the rings haven't seated in yet

the old mechanic's trick is to put Marvel Mystery Oil in the gas....Google it

Noel-theknurl
 

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Discussion Starter #8
My throttle bodies were really dirty too I think the air box wasn't seated correctly from factory or setup. Maybe this had something to do with it. Thanks for the replies.
 

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its oil, either from the valve seals or the rings haven't seated in yet

the old mechanic's trick is to put Marvel Mystery Oil in the gas....Google it

Noel-theknurl
Dexron III ATF also works well if not better. Sounds crazy, but I also notice a power increase when I use it. 1.5 ounces per tank.
 

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Does'nt look right for such low miles, have you owned the bike from new? the valves should be clean at those miles.
Have a look at the air filter and see if it has been over oiled, some people put far too much oil on the filter
 

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Same issue with 1078

5,200kms on clock and I have the same (all 4 cylinders intake valves) but not as much carbon as snooky. Only difference in my case it that the bike keeps fouling spark plugs (till now cylinder 1 only- 3 times so far every 1,200kms).

I checked:
coils
injectors
sensors
Valve clearances
compression (thus piston rings)
and all OK. Did not check valve stems.

I agree with all comments, only to add: ECU. I suspect and hope that my ECU is doing something wrong and fuel mixture is screwed up.

VDSTS diagnostic identified 5SM ecu on the bike but indicated euro2 not euro3 which seems odd..

P.
 
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