1078 Carbon Buildup on Intake Valves - MVAgusta.net
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post #1 of 14 (permalink) Old 07-10-2010, 02:06 AM Thread Starter
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1078 Carbon Buildup on Intake Valves

I've been having problems lately with my 1078. It has a little over 4,000 miles on it and it did sit for 10 months while I was away at school. I got it running about a month ago and it ran fine. About week ago it felt like it was missing (intermittently at first). Now it will stumble up until about 7,000 rpms (Probably can't feel it because the motor is rotating that fast). So the first thing I wanted to check were the spark sticks. I pulled the airbox off and I looked down into the ports and noticed some hellacious carbon build up on pretty much every valve... at least more than should be with only 4,000 miles. I pulled the plugs and none of them were in that bad of shape. Right now #1 cylinder has intakes open and there is definitely buildup on the seats of the valves. I'm thinking this maybe my cause for the missing. There is a lot of oil mixed in with that carbon. The O rings on the cover are not to blame...so valve seals I'm guessing.
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post #2 of 14 (permalink) Old 07-10-2010, 02:34 AM
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Pour in a bottle of RedLine Fuel Injector Cleaner for the next 2 tanks of fuel. Should clean up the deposits. http://www.redlineoil.com/product.aspx?pid=116&pcid=12

Joe - mv2envy
AKA. MV Guy 12345
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post #3 of 14 (permalink) Old 07-10-2010, 06:53 AM
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I've been having problems lately with my 1078. It has a little over 4,000 miles on it and it did sit for 10 months while I was away at school. I got it running about a month ago and it ran fine. About week ago it felt like it was missing (intermittently at first). Now it will stumble up until about 7,000 rpms (Probably can't feel it because the motor is rotating that fast). So the first thing I wanted to check were the spark sticks. I pulled the airbox off and I looked down into the ports and noticed some hellacious carbon build up on pretty much every valve... at least more than should be with only 4,000 miles. I pulled the plugs and none of them were in that bad of shape. Right now #1 cylinder has intakes open and there is definitely buildup on the seats of the valves. I'm thinking this maybe my cause for the missing. There is a lot of oil mixed in with that carbon. The O rings on the cover are not to blame...so valve seals I'm guessing.
Do a search for PP1098, he had similar issues

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post #4 of 14 (permalink) Old 07-10-2010, 09:43 AM Thread Starter
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I had sent him a PM... waiting to hear back
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post #5 of 14 (permalink) Old 07-11-2010, 07:53 AM
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post #6 of 14 (permalink) Old 07-11-2010, 08:00 AM
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Do a search for PP1098, he had similar issues
Congrats on your new bike btw
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post #7 of 14 (permalink) Old 07-11-2010, 10:04 AM
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Congrats on your new bike btw
Thanks Phil, congrats on yours too! I was also pulled in the RSV4 direction, but decided on the other

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Previously (and about 40 others)748SP, S4, S4R, 98R1, 2000 F4, F41000S, F41000R, 08R1, 09R1, S1000RR, RSV4 Factory aPRC in Garage now
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post #8 of 14 (permalink) Old 07-11-2010, 08:56 PM
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The lousy E10 gas we get will cause deposits on your valves.

Recommend Sea Foam or Yamaha Ring Free in a "shock" treatment mixture to clean everything up in the combustion chamber. Then I recommend StarTron fuel treatment any time you park the bike for more then a couple of weeks.

E10 gas has a shelf life of about 14 days before it starts to degrade and suck water out of the air.

I used to be fast....now I just dream about it.
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post #9 of 14 (permalink) Old 07-11-2010, 09:31 PM Thread Starter
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I had added stabil before I left for school last summer and this summer I've been riding it at least once every couple days... so the gas has been pretty fresh, as far as not breaking down. I'm in the process of getting most of that crud off of it and then I'm definitely doing fuel treatments periodically
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post #10 of 14 (permalink) Old 07-11-2010, 09:39 PM
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Stabil is worthless with the E10 gas we now buy. The alcohol still precipitates out and degrades the octane, collect water and forms sludge.

Do a Google search. The outboard engine business began having HUGE problems with E10 gas a few years back. That is the genesis of the StarTron product.

You can't hear an outboard detonating itself to pieces...it just suddenly has no power...and the owner has a major repair bill.

I used to be fast....now I just dream about it.
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