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MOTOBRICK MARKETPLACE => FS WTB WTT ~ Bikes ~ Parts ~ Gear => Topic started by: nortonbrian on October 27, 2014, 04:48:02 PM

Title: WTB
Post by: nortonbrian on October 27, 2014, 04:48:02 PM

I want to buy, rent or whatever it takes for a GOOD HES for a K75.I am chasing an   elusive misfire, and checked everything else.
Thanks
Brian

Title: Re: WTB
Post by: Grim on October 27, 2014, 07:33:40 PM

Have you tried cleaning the ecm and fuel tank plugs?  The dielectric grease dries up and you start getting electrolysis corrosion in them.

Title: Re: WTB
Post by: nortonbrian on October 28, 2014, 02:26:36 PM

Cleaned and checked every connector, including grounds. Hotb wired the coils to an external battery, by passed ignition and kill switch. Its an intermittent misfire like hitting the kill switch on a dirt bike.Just trying to eliminate components, swapped the efi unit out with a known good one. If I can try a good HES that would narrow it down!

Title: Re: WTB
Post by: Scott_ on October 28, 2014, 06:33:06 PM

When was the last time the valve clearances were checked.......

Daughters honda srv would have intermittent miss fire, due to out of spec valve clearance issues.
Adjusted the gaps, hasn't skipped a beat since.

Title: Re: WTB
Post by: Grim on October 28, 2014, 08:46:04 PM

These bikes are very temperamental about a few things. It may be a lean out misfire. I'd check for vacume leaks. The crank case vent is common fail point the boots on the throttle bodies is another fail point. There is a rubber manifold on the back side of the throttle bodies that feeds the fuel pressure regulator. It cracks with age. 
This is issues I found on mine.
http://youtu.be/Cwjm7W8I0dQ (http://youtu.be/Cwjm7W8I0dQ)

Title: Re: WTB
Post by: nortonbrian on October 29, 2014, 01:30:04 PM

I check the spark on #3 ht wire [easier to get to] with an inductive "pencil' tester. Rev the motor, and the neon indicates loss of spark in time with the misfire. Its not the feed to the coils, but the signal from the ignition box or HES. I got an ignition box from e bay, but have no way of knowing that its any good as well! Would anyone care to see if my box works on their bike?
Thanks
Brian