Intermittent Death Rev??

[TecateDan]

I took my 1985 Tecate out for a good thrashing the other day and About half way through the ride I startte3d to get some intermittent DEV REV! I know crank seals are a common cause of this but I changed them when I rebuilt the motor and have put mabey about 6-7 hours on the motor since then? I was just sitting at idle when all of a sudden it reved out of control and I had to dump the clutch and stall it out. Restarted it and took it for a quick rip and it was fine for mabey 2 hours. It did it once more later in the ride but other than that it ran and Idled perfectly. The trails were real wet and muddy but I have a stock airbox. Any body got an idea of what would cause an intermittent problem? Also what would be the easiest way to check the crank seals<<

[shortline10]

Check your intake boot for leaks/cracks . Also could be a sticky float valve .

[dcreel]

The filter on your petcock may be dirty, dirt in your fuel tank..

[jeswinehart]

Yeah, I am with D'creel on that. I am sure he is thinking it basically was on the start of running out of fuel and was going into death rev before dying.
IMO if crank seals or intake boot was the problem it would be a consistent problem and not intermittent, especially at idle.
Might even check the tank cap vent hose for a partial obstruction,
To make a leak down test set up > http://www.3wheelerworld.com/showthr...r-for-about-20
Many other extremely useful stuff in the "WORLD class help" section

john

[TecateDan]

Thanks for the tips Guys!! I had 3/4 of a tank so I didn't even consider the fule tank but it is quite possible that I have dirt in the tank or an obstructed screen...

[tri again]

So these 2 strokes will run fast when running out of fuel?
like the old .049 little airplane engines?

I wonder why chainsaws don't do that?

Interesting.
and the danger is the machine going unpredictably fast at the wrong time
and overrevving too?

Thanks for the insights.
I had no idea.
Looked at a 250R today but never knew these were issues with 2 strokes.

[fabiodriven]

and the danger is the machine going unpredictably fast at the wrong time
and overrevving too?
.

The danger is blowing the top end from a lean condition.

Dirty screen, stuck float, and bad vent are all very plausible. I have to ask you Daniel-san... Does your carb have the little plastic skirt around the main jet? Mine fell down off it's seat and caused a death-rev with my Tecate.

Did they teach grammar at BU? I know a guy who went to Harvard and he doesn't type like that.

[Chazz of Blades]

I always like to think that Doc is typing in his own poetic style, like a Docku, similar to a haiku, but nobody knows the format.

[fabiodriven]

I always like to think that Doc is typing in his own poetic style, like a Docku, similar to a haiku, but nobody knows the format.

I was referring to Dan's grammar. I also came to the conclusion that the good doctor types in Haiku. Interesting that we both thought that.

[TecateDan]

Who is the "good doctor" and I was a math and science guy not a grammer person...

[Dirtcrasher]

I want a KONGO bar..................

[TecateDan]

??? what is happening to this thread I have no Idea what you guys are talking about anymore

[Chazz of Blades]

Drjoe171, "Doc, The Good Doctor, and a few other monikers" -Was a trauma doc for many years, and in my opinion one of the most interesting people on here, always learn something new from him, pay attention when ya can.

And Fabs is just.......well...............ignore him and maybe he'll go away. :P


I have no idea what Steve is talking about.

[Motorious]

I want a KONGO bar..................

I don't know what DC is talking about here either, but it made me LOL.

"INTERMITTENT DEATH REV"... Great name for a death metal band.

[just ben]

did you get the issue taken care of? I have seen needle and seats that are so worn the needle doesnt drop down with the floats,running the carb out of fuel. also if it has the plastic floats in it make sure the rods they slide on arent bent