To clean a set of used and gooped up cylinders, can I just soak them in parts solvent? They are pretty "funked up" and that's probably the best way to clean, but I don't want to disintegrate the powervalves so I thought I'd ask.
Thanks,
Craig _________________ Craig
MC21 SP Rothmans
MC21 R fake Rothmans - track bike
MC21 SE R9N
If your thinking degreaser like Jizer etc then it will not harm the alloy. I used some chemical stuff a few years back to clean up some kr1s calipers and it turned the alloy black, that was industrial cleaner though! _________________ More **** two strokes than you can shake a **** stick at.
Thanks again, this helped motivate me to remove and clean them which I discovered they desperately needed once they were out. For anyone seeing this who is looking for assistance in doing their own, I recommend first soaking in your favorite lube (WD40 worked for me), then twisting the shaft with a wrench. We didn't do that on the second one (got excited after the first one was out and cleaned up) and once the shaft was out the valves were still stuck in place. We had to reinstall the shaft and wiggle the valves to get them out so it's worth a little twisting before removal.
Craig,
I've never done mine but just got my new seals and clips a couple days ago so I'm planning to within the next week or so. I dropped the exhaust on my lower cylinder a couple weeks ago to get a look inside and mine look like they could use a good scrubbing. They were also sticking occasionally.
Tell me about pulling yours. How did you get the shafts out? I was going to try to configure a puller if need be. Once the shafts are pulled I assume the the valves simply come out through the exhaust in two pieces? Did you need to do any cleaning inside the ports?
Thanks for any info, it will probably be helpful when I tackle mine.
Dad and I removed the nut and washers from the shaft, then replaced with a off-the-shelf washer and the original nut. We used a set of vice grips to surround the shaft WITHOUT clamping on it. All the vice grips did were sit under the washer. Then we carefully tapped on the vice grips with the handle of a hammer and they lifted right out. I can see how it would be a struggle if they were insanely cruddy and then a puller would be needed. These were dirty but the shafts weren't stuck.
Be careful not to mess up the shaft with the teeth of the vice grips, and if it doesn't tap right out I'd do the stack of washers method to pull directly perpendicular to the surface of the cylinder.
The first one brought the clip with it and also popped the seal. The second shaft pulled through the clip and bent it. To remove the seal I just used a wooden shim for leveling doors and placed it on the surface of the cylinder to pry on. Then I used a smaller screwdriver to pry and it popped right out.
As I said make sure the valves are loose in the port before removing the shaft. Once the shaft is out they will fall out the port where the pipe attaches. If you're doing it with the engine still together you may have to work them out with a screwdriver but as long as they're not stuck they will come out with some fiddling. When the engine is apart and you're holding the cylinder you just shake it a bit and they fall right out. The bottom cylinder should be fine; I'd think the top one is where you will have to hold your tongue just right to wiggle them out.
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