F4 750 hiss noise? - MVAgusta.net
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post #1 of 11 (permalink) Old 06-24-2009, 07:32 PM Thread Starter
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F4 750 hiss noise?

I've just fitted Sil Moto pipes and a new eprom (not sure what type, I bought the lot of ebay)

When I'm riding at low rpm say through town and i let off the throttle to change gear or slow down i get a hiss/gas noise from the engine. I've had a search around on the forum and I cant quite say if other peoples problem is the same as mine. Some info and advice on the problem would be much appreciated.
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post #2 of 11 (permalink) Old 06-25-2009, 03:00 PM
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Hey.. I am having the same problem on my 750 as well.. but i don't hear the noise on low rpm's i hear it when i am shifting..i know for a fact that when i am riding fast or slow i don't hear it... its just those couple of secs when i am shifting. I hope some of the guys on here can help us out... maybe tell us why this might be happening...

Thanks alot!!
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post #3 of 11 (permalink) Old 06-25-2009, 03:22 PM Thread Starter
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Just been on the dyno today and the fueling is all over the show. It runs really lean on idle which is causing the hiss noise when shifting up the gears.

I just need to know if the chip for the Sil Moto pipes is any good? Has anyone tried it and had the bike on the dyno afterward?
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post #4 of 11 (permalink) Old 06-25-2009, 03:35 PM
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My 750 never made any noises like that. Sorry no help


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post #5 of 11 (permalink) Old 06-25-2009, 08:42 PM
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Scrap the eprom and get yourself a power commander. That way when you put it on the dyno, the tech can adjust the fueling that is all over the place.

As far as the hiss goes, make sure you don't have any vacuum leaks.
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post #6 of 11 (permalink) Old 06-25-2009, 11:23 PM
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I have the PC III you need to make your bike run the way you want, check my post in For Sale section. Forget chips...custom map is the way to get that old ECU fueling correctly.

I used to be fast....now I just dream about it.
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post #7 of 11 (permalink) Old 06-26-2009, 04:36 AM
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dynamite under your seat......sorry couldnt help myself.
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post #8 of 11 (permalink) Old 06-26-2009, 05:33 AM
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Quote:
Originally Posted by esq'z me View Post
I have the PC III you need to make your bike run the way you want, check my post in For Sale section. Forget chips...custom map is the way to get that old ECU fueling correctly.

There are custum chip solutions http://www.protwins.co.uk/Ultimap/ultimap_software.html

I got it in my 750, no extra connectors or electronic devices, but a custom map in a chip in the original ECU


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post #9 of 11 (permalink) Old 06-28-2009, 08:12 AM Thread Starter
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Thanks for the help guys, i have bought a power commander second hand. Has anyone got a map I could use to start from. All I have is the Sil Moto exhaust fitted. Thanks
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post #10 of 11 (permalink) Old 06-28-2009, 08:21 AM
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did you check for snakes?
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