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Discussion Starter #1
Good afternoon gentlemen,
When I goose the throttle my motor cuts out at high RPM's. I changed the spark plugs and ran some sea-foam through it and still continuing to cut out. The cut out will last a split second (as if it misfired) and the bike feels kind of weak. Could be my mind playing tricks on me by saying I think the bike feels weak. I have about 6000 miles on it.

Ive been running a couple tanks of 110 race fuel in it periodically through out the summer and I feel that has something to do with it acting up. It started acting up when I just about ran out of gas (110 race fuel) and barely made it into the gas station and filled up with 92.

Any tips, advise, help, anything at this point would help before I suck it up and bring it in to the dealer..
 

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what did the plugs look like??? Wet fouled, lean or right where they should be?

Asking the obvious, checked the air filter for obstruction or contaminant??
 

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I'd check the plug wire connections, clean them, and use some dielectric grease on 'em. Look closely at the plug wires for issues. Maybe replace them. I'd also check and clean both battery terminal connections and do the same thing. Find where the ground wire goes and check that too.

Sometimes these things are process of elimination and a chance to do some good maintenance.
 

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Plus 1 on the fuel pump or could be a dirty fuel system. At high rpms the demand for fuel is at its highest and a dirty system or even a partially dirty injector nozzle will cause a loss of power. Sea Foam is a good start... but it takes time for the system to get the most out of it.
 

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Discussion Starter #8
Could be the power commander at that RPM needs adjusted. I had to tweak mine in the power band to get the best performance.
you know i was thinking the same thing however Ive never had an issue with it up until now. And the map cant change unless you physically take the power commander out and hook it up to a lap top.
 

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Discussion Starter #9
I'd check the plug wire connections, clean them, and use some dielectric grease on 'em. Look closely at the plug wires for issues. Maybe replace them. I'd also check and clean both battery terminal connections and do the same thing. Find where the ground wire goes and check that too.

Sometimes these things are process of elimination and a chance to do some good maintenance.
Checked the wires, they seem fine but Im going to go get some elect grease now and see if that doesnt help. I wouldnt doubt it being a fuel pump related issue but being it only has 6000 miles on it, its tough to believe that it would be going belly up already.
 

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On another note, why would you run 110??????
 

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Checked the wires, they seem fine but Im going to go get some elect grease now and see if that doesnt help. I wouldnt doubt it being a fuel pump related issue but being it only has 6000 miles on it, its tough to believe that it would be going belly up already.
It is actually the lack of mileage that kills these pump assemblies. Stale fuel rots some of the rubber pieces is one common problem. I get 3-4 low mileage pump assemblies from across the country every week..
 

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By the way you can only check plug wires with a meter.
110 gas will not give you much of a benfit but it will make your motor run hotter
 

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i do not think race gas makes the motor run hotter. they use race gas in higher compression engines to keep them from detonating. the more octane the more heat it takes to ignite it without a spark. so it soaks up more heat before the spark ignites it. as far as it being a hotter explosion. i do not think the explosion is much hotter or more forceful. it is the compression of the motor the makes the power. correct me if i am wrong.
i would change my plugs and see what that does.
 

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We ran 110 race fuel in our race car a few years back, we didn't have the compression for it and it ran 15-20 degrees hotter with the race fuel then with 91 pump gas, and it ran worse with it.
 

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I was once told to stay away from race gas, that some race gas is leaded fuel wich isnt good for engines designed for unleaded fuel. Will someone in the know clarify this, it's just what I heard.wac
 

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not all race gas is leaded. i have 10.5 pistons in my bike with no need for race gas. even with the heat we have here in ms.
 

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Ya, there is no need what so ever for race gas in a stock engine. In fact if your bike was tuned with normal premium gas then run race gas, your map will be totally off. You will be fouling plugs and basically spitting out unburnt fuel. Race gas is designed for higher compression <12:1 engines. As well with race gas, you can lean out the fuel mixture more for a faster more efficient burn and not get pinging. (basic purpose of high octane)
 

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I was once told to stay away from race gas, that some race gas is leaded fuel wich isnt good for engines designed for unleaded fuel. Will someone in the know clarify this, it's just what I heard.wac
You can't use leaded fuel in a vehicle with catalytic converters. The leaded fuel won't hurt the engine it will hurt the catalytic converters.
 
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