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General Category >> Rubber Side Down! >> WOT - valid test? possible issue.
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Message started by DrunkenDwarf on 04/27/09 at 15:39:57

Title: WOT - valid test? possible issue.
Post by DrunkenDwarf on 04/27/09 at 15:39:57

I don't ride very hard, so I don't get to WOT very often. I decided to do a quick test in my driveway after I got home from work today.

I parked the bike and cranked the throttle wide open. A couple of odd things happened:

a) It didn't run smoothly at WOT
b) Slight smoke from exhaust
c) Exhaust picked up a funny smell

Is running the warmed up engine at WOT when it's parked a valid test?
Based on these symptoms, what do you think the issue is?

-D. Dwarf

Title: Re: WOT - valid test? possible issue.
Post by Reelthing on 04/27/09 at 16:04:05

to me it needs a load to produce actual wot results - hop on it and blow the cobwebs out say in 3rd gear - or 5th if you have room - see if it cuts out - or speeds up when you back off the throttle a little -

Title: Re: WOT - valid test? possible issue.
Post by Charon on 04/27/09 at 16:24:38

It has been reported that an electronic rev limiter exists in the CDI box. If so, it works by cutting out some of the sparks when the engine exceeds the rev limit. In turn, this will cause the engine to run irregularly, and will cause the unburned fuel (unburned because some sparks were missing) to make the exhaust smell different. Under no load the engine can exceed its rev limit, when it would not do so in gear under load. The engine might reach its rev limit in the lower gears.

Fuel injected engines with rev limiters usually work by cutting fuel delivery rather than ignition. Cutting fuel delivery causes no unburned hydrocarbon air pollution, while cutting ignition allows the fuel to go into the exhaust pipe.

Title: Re: WOT - valid test? possible issue.
Post by DrunkenDwarf on 04/27/09 at 16:52:39

The pattern of mis-fires (no-fires?) was too regular, I figured it was something like that.

I'll have to try WOT in 3rd/4th next time I'm getting on the highway.

Thanks for the quick advice.

-D. Dwarf

Title: Re: WOT - valid test? possible issue.
Post by alcoa on 04/27/09 at 17:22:57

:-?What is wot?

Title: Re: WOT - valid test? possible issue.
Post by marine5317 on 04/27/09 at 17:27:29

wide open throttle

Title: Re: WOT - valid test? possible issue.
Post by Charon on 04/27/09 at 17:36:10

Wide Open Throttle - WOT. I have also seen WFO, and I am not exactly sure what that means (yeah, I know - wide open). It is usually considered inadvisable to run engines wide open with no load, because they can be damaged. Electronic rev limiters reduce or eliminate the chance of damage. Rev limiters cannot protect against overspeeding caused by mistakes such as downshifting at too high speeds.

Title: Re: WOT - valid test? possible issue.
Post by bill67 on 04/27/09 at 17:41:37

I would never go wot in neutral it could blow the engine,What if it slipped in to gear, wow

Title: Re: WOT - valid test? possible issue.
Post by diamond jim on 04/27/09 at 18:11:59

That's a quick way to blue your header.

Title: Re: WOT - valid test? possible issue.
Post by DrunkenDwarf on 04/27/09 at 19:36:37

Oops!
Duly noted.

-D. Dwarf