Power loss

[ViperRon]

Greg I am with you that the issue with mixture just does not happen like that. I agree you have went threw everything electrical and it must be fuel some how but with what you have done seems you are now treating the symptom with adjustments you never had to make before I know you have went threw carbs probably 10 times as much as me and you would have seen a problem. I hate to say it but I'd be thinking about dumping that gas all of it in something else and get some somewhere else before I custom tuned them carbs. what I saw in the video you made does not appear to be a jet nozzle or needle problem as they do not get better with throttle and there is no power threw it and it improves. I know you have checked but Is there any place you could have a vacuum leak and missed it.

[BA80]

Not too many places to check Ron. All the intake boots are brand new and all the vacuum caps are good. The thing sycs and idles good.

This is the most perplexing thing I've ever run into. Motorcycle or automotive.

Besides, a vacuum leak would lean it out and that seems to be what it's liking. It ran ALMOST normal on the way home from work.

[dbeardslee]

Here's a crazy idea for you. Somebody mentioned a carboned up head as a potential cause, which got me thinking. You might try warming it up, removing the pods, and misting water from a spray bottle across the carb bells while it's running. It'll knock a lot of carbon off the top of the cylinders and the valves and might help it breath a little better... if that's the problem. You'll know if it's working by black smoke coming out of the tail pipes.

[BA80]

It's a thought Doug but actually I'm pretty mean to this engine most of the time. Ha ha ha ha......I've never been accused of carboning up an engine before.

[dbeardslee]

It's a thought Doug but actually I'm pretty mean to this engine most of the time. Ha ha ha ha......I've never been accused of carboning up an engine before.

Point taken. LoL

[stereomind]

a plug chop would have revealed this as a fuel mixture issue....... but that's none of my business..

[BA80]

a plug chop would have revealed this as a fuel mixture issue....... but that's none of my business..

Pretty tough to do the chop chop when the damn thing won't go.

Still wouldn't explain WHY fuel demands would change for no apparent reason. That has me baffled.

[stereomind]

I would file it under "something was wrong before and was affecting fuel mileage but somehow fixed itself now" and treat the symptom... lol

[BA80]

"fixed itself" doesn't exist. What, should I ride across country and hope it doesn't "unfix itself"?

[stereomind]

Right, but you're about out of stuff to replace, other than the mill itself.
So far, nothing has worked, other than leaning the mixture. This is consistent with "getting worse when hot" symptom. Going back to old mixture settings and then trying to "fix" the original problem seems counter-productive.

You mentioned your compression numbers wasn't it around 105 ish?.. was that dry/cold?

[BA80]

Again, I will HAVE TO ask. Why would the fuel demands change after 40 - 50 K miles? There HAS to be an explanation.

This engine isn't a computer. It doesn't get automatic updates.

[stereomind]

hrm, no telling. valves beating themselves into place, cam chain stretching, carbon buildup, false air.. or maybe it's just the right age for menopause.

[dbeardslee]

hrm, no telling. valves beating themselves into place, cam chain stretching, carbon buildup, false air.. or maybe it's just the right age for menopause.

I was about to post almost exactly the same thing when my e-mail went bing bong. LoL One thing that hasn't been checked yet to my recollection is the condition of the cam chain. Easy enough to do. If you've got a stock tensioner take it out, cock it, put it back in and let it go and then lock it down. Remove it and measure how far out the pad is, then release the nut and see how much farther it comes out. Might give you an idea of how long your cam chain has grown.

[BA80]

If you BOTH will read back to the beginning of this thread you'll see that I went to check valve clearances an found some damage to the cam lobes (pics included) and I actually changed out the cams.

BTW, cam timing was, and is, dead on.

[dbeardslee]

If you BOTH will read back to the beginning of this thread you'll see that I went to check valve clearances an found some damage to the cam lobes (pics included) and I actually changed out the cams.

BTW, cam timing was, and is, dead on.

I remember you changing the cams and setting the timing but didn't see any mention of checking the chain. But if the cams are dead on the dots when #1 is at TDC that does sort of suggest that the chain is okay.