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YZSKY.. (Husky CR125/Yamaha YZ125 crossbreed) won't rev past 3/4 throttleThis is a discussion on YZSKY.. (Husky CR125/Yamaha YZ125 crossbreed) won't rev past 3/4 throttle within the 2-Stroke Motorcycles - Exotic forum, part of the 2-Stroke Motorcycle Forums category; wow looks good. sorry I cant help you with your problem though... |
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#21
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| wow looks good. sorry I cant help you with your problem though |
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#22
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#23
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| That would be quite the shop cleaner wouldnt it hahah. |
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#24
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| ...guarantee the girlfriend wouldn't put it down, if nothing else the vibrations would beat the washing machine anyday! |
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#25
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| It will be interesting to see what is actually wrong. Have you ridden a similar yz125? I am curious about any changes you made to the air box. Did you have to make any? |
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#26
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All I can say is LMAO |
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#27
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| Well, it's the original Husky box and filter. Both carb venturi's are identical in diameter, and I'm kinda banking on the fact that even though they're completely different engines, they should both still displace roughly 125cc's with every stroke of the piston. I'm hoping that some fine jetting work will flatten out any minor issues raised by the transplant, I'm concerned though that generally jetting and reeds affect the lower rev range and not so much the top. I have no history with either of carbs, or the engine for that matter so I'm feeling around in the dark a little, I have no idea if either carb has standard jets or if they've already been changed (bearing in mind the YZ already had a set of Boyesens+cage fitted. Suppose this could even be a CDI issue or a crank case air leak, hope not though... |
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#28
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| Go with what Higs suggested for a minute. remove the cover off of the power valves and see if they are moving freely. I was hoping that you airbox was the culprit as I have had similar experieces, but it seems to be something else. |
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#29
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| ... good suggestion, haven't checked the valves yet. I'm expecting the new reed cage etc either today or tomorrow so will wait until that's installed then check that the power valve's moving freely. Will update shortly. |
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#30
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By the way, I like the black plastic on the Husky,, mine was all yellow and white, everyone thought it was a Suzuki. |
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#31
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| Cheers HiG4s... Update: Got the new Boyesen RAD cage and reeds today, fitted them.... and it's still the same Will pick up another plug tomorrow and take the bike out for a field trial to see if it's improved any, failing that it'lll be ebay for a CDI unit methinks. Thoughts anyone??? |
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#32
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| SOLVED IT!!! If you ever feel inclined to wac a YZ engine into a Husky, here's how to get it to run like a beast... Brand new Boyesen RAD cage and reeds, BR8EG plug, original Husky Mikuni carb with 400 gauge main jet and the needle clip set to second rung from the bottom. Yep, popped in the new plug, went back to the 400 main jet and raised the needle a notch. Took it out for a field run and the front wheel didn't touch the ground for the first three gears. As soon as the powerband hits, the front wheel won't stay on the ground. Revs out too, spluttered a little initially but then it cleared and stayed clear. Thanks for the input and suggestions chaps, much appreciated. Cheers... |
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#33
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| Sounds like you've really enjoyed this project. Congrats on getting it sorted out! |