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 Fuel mixture lean? Power loss?

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creid123
Carlotto
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PostSubject: Fuel mixture lean? Power loss?   Sat Sep 16, 2017 8:02 am

So thanks to Pete Roper and others on the forum for recommending the stock paper filter instead of the BMC. Made a noticeable difference on throttle response! However, the bike still seems sluggish and lacking power after adjusting the valves and changing the oil. I pulled the spark plugs after about 30 miles and it is running really lean. The plugs look really clean (no deposits). Could there be a throttle position sensor problem ? I have to get the speedo cable fixed and the comp has thrown up a "service" notice on the screen because the speedo cable is severed but wondering if there is some kind of "safe mode" that the bike runs in when there is a service indicator on.
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Pete Roper
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PostSubject: Re: Fuel mixture lean? Power loss?   Sat Sep 16, 2017 12:01 pm

Nope, certainly not if the service warning is speedo sensor related.

I suggest you go back and double check your work.

Pete
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beetle
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PostSubject: Re: Fuel mixture lean? Power loss?   Sat Sep 16, 2017 3:50 pm

What Pete said. Other things to check: throttle body balance (including throttle stop screw paint for evidence of shaved ape tampering). Get GuzziDiag so you can reset the TPS.

Also, after rechecking your valves, pull the main fuse for 1 minute to reset the fuel trims.

.
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2highlander
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PostSubject: Re: Fuel mixture lean? Power loss?   Sun Sep 17, 2017 12:35 am

What fuel trims?
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Pete Roper
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PostSubject: Re: Fuel mixture lean? Power loss?   Sun Sep 17, 2017 1:15 am

Stock map runs closed loop so the ECU *Learns* how to alter, (Trim) the fuel over a period of time. There is an active function that will trim over a shortish period of time and then a longer term trim that will occur over a longer period of time as the machine is used in different conditions. This usually takes about six to eight hours of varied riding.

Pete
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creid123
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PostSubject: Re: Fuel mixture lean? Power loss?   Sun Sep 17, 2017 9:06 am

So you're saying the GRiSO has artificial intelligence, Pete?

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2highlander
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PostSubject: Re: Fuel mixture lean? Power loss?   Mon Sep 18, 2017 12:27 am

Thanks Pete for the explanation, I think you mean selfadaption? The feature itself is not new to me but resetting it by pulling the main fuse or in conclusion also by disconnecting the battery. Always thought guzzidiag would be the one and only way to do this ....
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