Cutting back ?
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I stuck the outlet (skinny) pipe into the inlet (fatter) pipe to cause a continuous loop. Been like that and ok for a 1000 miles, just don’t forget to block the inlet manifold oil inlet. I just cut and folded over some pipe, then zip tied it.
It stopped messing it’s pants all over the number plate now as well since I’ve been on pre mix...I can’t remember what I’ve asked you before, but t did you do anything to the bike before it started happening? Even if it was a month before or seems irrelevant?...
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Did you remove and clean the outside of the needle valve tube? You tap it in and up through the throttle valve body to remove it. Mine was cemented up with micro fine sand stuff...
P.S. Did this come on all of a sudden or gradually get worse?...
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@spookdog It’s progressively got worse I think. All I have done is moved the read switch, put a full dep on and turned the power valve so it works. It used to do it after 40mins of riding but not it seem to do it constantly. Won’t got about 6-7krpm it just cuts back. I might try what you done with the oil pump just to rule another thing out. It’s massive annoying specially as I don’t a 100 mile long distance trial today and had to put up with that all day.
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@calum it ran really well after I moved the Reed switch and done the power valve. Had all the power I want up to 11k rpm. Just seems to have got worse over time, just won’t rev past 6k rpm. I pinned the power open as I saw in one of your other posts but it still did the same. I’ll check the Reed is far away enough from the speedo tonight as it feels like a restriction. Other than this the bike runs perfectly.
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@spookdog im going to put it back to standard and see how it runs and work backwards I think. Do you know if there a decent guide to doing to power valve with pictures or even a video? I just want to make sure it’s definitely right, I’m no mechanic but I like to do it myself so I can learn how it works in case of future problems
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Everything you need is out there. I can’t help you, I don’t have a computer. I found everything out by searching on my phone...
I would change the exhaust back to standard as well. Just to check and tick it off the list. You never know it could be blocked up with carbon oil and shit...
The only other thing is: does it cut back regardless of throttle position? I can achieve 10,000 rpm at 1/2 throttle. Does yours cut back at different throttle position as it reaches 6-8k? Say if you maintain 1/3 throttle in second gear?
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@spookdog thanks for your responses. I’m going to put everything back standard and double check the carb is spotless I’ve decided before I loose my Head with it all. It won’t go past 6k in any throttle position. I feel like it’s electronic so just want to rule everything else out first
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I thought I should update this as I did fix the problem and never stated what fixed it on here. After all the messing around all it turned out to be was a split vacuum hose on the carb which I didn’t notice when I cleaned the carb originally. I had the hose off originally to check it wasn’t blocked but didn’t notice the small split in it. Thanks for all the suggestions though
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