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Post by 2twisty on Jun 3, 2014 22:28:37 GMT -5
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Post by 2twisty on Jun 3, 2014 22:12:14 GMT -5
There is some small amount of scrape marks at the bottom of the slide. However, the slide moves very smoothly in the bore. In fact, I have tried every way I can think of to make this thing stick. I'm wondering if something has happened to the emulsion tube...
I removed the needle and examined it carefully. It's smooth through its entire length and is not bent. The diaphragm has no holes or cracks and is quite supple.
Do any of you know what this carb is a copy of? If I wanted to order a rebuild kit for it, what would I look for?
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Post by 2twisty on Jun 3, 2014 15:48:43 GMT -5
yes, I am doing all that. I can't manage to make it stick unless I am riding the bike. if I wanted to smooth the bore in the carb, what would I use? steel wool? 1500 grit wet?
How can I tell whether the sticking is from the needle or from the slide?
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Post by 2twisty on Jun 3, 2014 9:22:48 GMT -5
I don't think it's the diaphragm. This is because it's physically stuck. Once I free it, I can't for the life of me make it do anything slide like it's on greased snot. It feels great -- perfect, actually, until I reassemble and it works for a while.
I am certain that I'm installing the spring correctly. I've never disassembled the slide/diaphragm/needle assembly, so it can't be that I put it together wrong.
My next step was to remove the needle and check to see that it's not bent. However, I would expect that I could feel it binding if it were. I was hoping to find a way to fix this without removing the carb, since I can't see a way to remove it easily without taking lots of plastics off.
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Post by 2twisty on Jun 3, 2014 9:18:49 GMT -5
Just make sure you replace that axle nut! My original kept working loose and that's what caused my wheel to strip out.
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Post by 2twisty on Jun 2, 2014 23:49:01 GMT -5
I have a Roketa 250B, VOG 260/Linhai clone engine.
Recently, I noticed a real lack of power and acceleration. I finally diagnosed it as the carb slide was not moving properly. If I open the seat and tap on the cover for the diaphragm, it works fine for a few minutes and then gets stuck again. Sometimes it will stick and unstick all on its own.
If I stop the engine in the "stuck" state and remove the diaphragm cover, I have to apply a moderate amount of force to get the diaphragm and needle to come out of the carb. I can immediately reinsert it and it slides like it's glass. I am unable to get it to stick when manipulating it.
When it works, it works great. When it fails, it's like someone snuck into my garage and replaced the 250cc engine with a 150.
Apart from just replacing the carb, what can I do? I'd rather fix it than just throw parts at it.
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Post by 2twisty on Jun 2, 2014 23:38:40 GMT -5
My 54B is a VOG clone, and I got the rear wheel from Scrappydogscooters.
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Post by 2twisty on Jul 19, 2013 11:09:54 GMT -5
richardthescooter1, Do you have this reubbing/buzzing sound? Are you talking about lubricating the slider pins or the actual pistons, IE removing the caliper and pads and lubricating the surface of the piscton?
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Post by 2twisty on Jul 19, 2013 10:20:18 GMT -5
Yeah, forgot to mention that -- the speedo is not the cause. Removed the cable completely and it still does it -- although the sound it's making is very similar to that of a speedo cable failing, but the pitch it lower.
Definitely has something to do with the front wheel.
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Post by 2twisty on Jul 19, 2013 9:13:02 GMT -5
Well, considering that a failed front wheel bearing could cost me my life, I'd rather not ignore it.
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Post by 2twisty on Jul 19, 2013 8:28:03 GMT -5
New to me 54B with 2500 miles on it. Ran fine until a chance meeting with a pothole blew out the valve stem (yes - shot it right outta there!)
I took the wheel off and had a shop put a new stem in.
I put the wheel back on and went for a ride. After a while, I noticed a strange buzzing sound - somewhat like a failed bearing -- not a hum like a car bearing, but oddly very similar to the sound that the bearings in a computer's CPU fan make when failing -- a groaning buzzing.
At first, I thought that perhaps I had tightened axle too much and killed the bearing. So I ordered some bearings and am still waiting for them.
I took it for a ride yesterday and found that I could make it make the noise at speeds between 10 and 20MPH (indicated), adn that application of the brake would make it stop.
Over 20MPH and it was too hard to hear due to wind, engine and road noise, so I don't know if it went away over 20MPH or I just couldn't hear it.
What gave me pause was teh brake thing. In my experience with cars, application of the brake does not eliminate teh sound of a failed bearing.
So I jacked up the front end and well, the wheel spins smoothly. I can't find anything wrong up there.
I guess I can wait for those bearings and just install them an pray, but I really hate throwing parts at a problem.
Any ideas?
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