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flyboyaviator 12-24-2013 04:23 PM

2008 F4 312
Atfer a good run of maybe 40 miles, if I stop for gas, the bike is hard to keep running, it start and stops, quite a few times; the temperature is no more than 212-220 or so. Some times I need to wait like half hour or so before it runs steady. Any advise is appreciated. My bike with only 2532 miles.

gary behr 12-24-2013 08:10 PM

I had the same problem with my 09 312 and my 06 1000
I did the impeller water pump upgrade and it seemed to work.

Leo and andres at unique superbikes in Miami usually have it in stock

flyboyaviator 12-25-2013 02:38 PM

Thanks Gary, will give these guys a call after New Years and make an appoinment. Happy New Year.

Sagerider 12-25-2013 04:26 PM

If have not done so already get the Muzzy fans as well as the upgraded water pump impeller and outer case. Have them replace the seals in there while they are at it. My 2008 started puking coolant out of the bleed hole from a leaking seal on the coolant side. Easy and cheap insurance. :)

mitchy 12-28-2013 06:38 AM

This is a stalling problem isn't it,not overheating.Sometimes Iridium spark plugs can solve this problem and a check on the TPS setting.

flyboyaviator 01-10-2014 05:55 PM

Hi! Gary, I contacted Leo, he is going to replace the impeller and fan in a couple of weeks, never dealt with them brefore, any opinion on their shop? Thanks. Hugo

jomarti1 01-11-2014 09:41 AM

They are good guys. And Manuel the mechanic is excellent.

Ammo 01-11-2014 09:57 AM

Can it also be caused by fuel vapors locked inside the fuel tank..say a faulty gas cap?

silentservice703 01-11-2014 10:23 AM

Yes, and it can be caused by fuel line problems and/or a clogged vapor cannister.

flyboyaviator 01-12-2014 05:48 PM

Thanks for all your good advise, I'll be taking the bike to SBK in Miami this coming month of Feb, for a new impeller, and a new valve gasget, and an oil change. Thank you all.

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