Full throttle woes

[Oldnick]

Hi guys.

My triked 98 Valk has the 6 degreee trigger wheel fitted. My question is about what this might mean to throttle response. I undferstand it gives low down torque at the expense of high rev power. That's fine.

My problem is that the last...1/5th of the throttle actually seems to _lose_  torque at klow to mid revs (2000-4000).

I have driven trucks and diesel vehicles and know that feeling where planting your foot produces no response. This feels different. I am pretty sure I can feel a drop off in acceleration if I wind that last bit.

So. Is tht tyhe degree wheel acting, or is there another problem?

Having seen the mod that uses the cold engine advance to increase low down torque even when wrtm, I am seriously looking at reverting to the stockl trigger wheel and going the electric route, but my current trouble may be elsewhere and I would be interested.

Thanks for any help

Nick

[pancho]

This may seem like a no-brainier Nick, but the first thing I would do is take off the trigger wheel and replace it with a stock one and see what you have,,, if it still acts the same, I would be looking at the carbs.

[Ricky-D]

I guess your failure to mention the air box modifications, plus the carburetor rejetting means you feel, there is no relationship to the problem you now experience. For this I feel you are sorely mistaken, and the changes you have made, are totally the cause of you present predicament.

***

[Oldnick]

I guess your failure to mention the air box modifications, plus the carburetor rejetting means you feel, there is no relationship to the problem you now experience. For this I feel you are sorely mistaken, and the changes you have made, are totally the cause of you present predicament.

***

many replies come to mind...but huh?

[Oldnick]

This may seem like a no-brainier Nick, but the first thing I would do is take off the trigger wheel and replace it with a stock one and see what you have,,, if it still acts the same, I would be looking at the carbs.

Not a no-brainer. I would have thought tgat asking was easier than probably $100 for a new wheel and x hours to replace it.

Let those who dfo not know just shut the snuggle up. OK?

[John Schmidt]

This may seem like a no-brainier Nick, but the first thing I would do is take off the trigger wheel and replace it with a stock one and see what you have,,, if it still acts the same, I would be looking at the carbs.

Not a no-brainer. I would have thought tgat asking was easier than probably $100 for a new wheel and x hours to replace it.

Let those who dfo not know just shut the snuggle up. OK?

Nick, if you want a stock trigger wheel I have a spare for the cost of mailing it. Have no idea what that would cost from Florida but it's there if needed. As for the 6 degree wheel, I don't feel that's your problem, they just don't act that way. Personally, I'd leave that alone for now and look elsewhere. It could be as simple as a faulty petcock not allowing adequate fuel flow above a certain RPM. I've seen that in other installations, just seems to go flat on the torque curve, found it was due to a lack of fuel flow. Keep us posted on what you find.....or don't find. 

[longrider]

I wouldn't mess with TW yet.  These carbs can be a bit tricky.  I, like the op had a valk that did the exact same thing. All stock and fairly new.  I not sure if the jetting allows quite enough fuel a WOT and leans out the mixture.  Maybe adjustable needles would do some good

[Bighead]

I guess your failure to mention the air box modifications, plus the carburetor rejetting means you feel, there is no relationship to the problem you now experience. For this I feel you are sorely mistaken, and the changes you have made, are totally the cause of you present predicament.

***

He said nothing of any modifications other than the Trigger Wheel.
I put one on my bee in about 1999 and have never had the problem he describes. I don't know the problem but would say it is not that.

[Steel cowboy]

just a thought, but have you checked the throttle cable is operating properly.

[bentwrench]

Low flow from the petcock could cause a power drop at full throttle also.

[Gavin_Sons]

I had the same problem and mine was a clogged main jet. Cleaned and fixed the problem.

[Oldnick]

Thanks for all the input guys.  Sorry I am so slow to reply.

I have not had time to delve yet.  Looks like I need to look at carbs jets petcock valve etc.

Just a question.  Would carb sync have anything to do with it?

To clear things up fir a couple of replies.  This is not a rev range issue.  At any revs WOT causes a distinct drop of power. I know the trigger advance causes some power drop at high revs but this is not that.... so to speak.

Nick

[Oldnick]

just a thought, but have you checked the throttle cable is operating properly.

Never occurred to me.  Nice simple check to do for a start

Nick