Trials
Well-known member
and yet it has been done.
Some skill may be required to pull off anything that I indicate as being a bush fix
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Valve adjustment
- Thread starter ALD
- Start date
Some skill may be required to pull off anything that I indicate as being a bush fix
It does have its upsides. If the paper rips, you were too tight. You can be way too tight with a metal feeler and still rip it through. I have never had issues on cars or bikes, lawnmowers on the other hand. Frig me. So little tension in those valve springs, setting lash is a nightmare.and yet it has been done.
Some skill may be required to pull off anything that I indicate as being a bush fix
Trials
Well-known member
Then you would not be one to try and service a Honda powered Montesa.
Practice using a micrometer on your feeler gauges and see how tight it has to be like I keep saying :/ it works.
In shim-under-bucket applications that I've seen, there will be only two available shim thicknesses that will put the clearance within the allowable range. There's no "set it to 75%" or whatever. If the spec is 0.11 - 0.20 mm and the shim that's in there is a 1.65mm and it's a smidge too tight, you'll have a choice of using a 1.60mm to put it in the tight half of the allowable range or a 1.55mm to put it in the loose half of the adjustable range.
OEM shims come in 0.025mm increments, but you'll not find those in aftermarket shim kits that I've seen - they're all 0.05mm increments. Only way you have those is by luck if you've kept them from previous adjustments of an engine that happened to have those in it from the factory, and you happen to have one kicking around.
OEM shims come in 0.025mm increments, but you'll not find those in aftermarket shim kits that I've seen - they're all 0.05mm increments. Only way you have those is by luck if you've kept them from previous adjustments of an engine that happened to have those in it from the factory, and you happen to have one kicking around.
See Brian's answer about four posts up
Looks ok normally clearances tighten not loosen I would leave it alone.
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He is close to or at the tight end on 3/4? All within spec though. I would follow brian p's recommendations.
No. You are within specifications right now.
You *could* put a shim 0.05mm thinner in both intake valves, but then you would be on the loose limit of specs instead of 0.01mm clear of the tight limit.
You *could* put a shim 0.05mm thinner on the left exhaust valve (currently at tight limit) and end up 0.01mm clear of the loose limit on that valve (same as where the right valve is now), and you *could* put a shim 0.05mm thicker on the right exhaust valve (currently at loose limit) and end up 0.01mm clear of the tight limit on that valve (same as where the left valve is now).
Or you could leave the darn thing alone, because it's fine the way it is.
Thank you
I was going leave everything the way it was and reinstall the valve cap couple days ago but figured I have never done this kind of work before and decided to go ahead and swap 2 x intake and 1 x exhaust to 0.05 thinner. It was easy on the cbr250 just pull the rockerarm pin. I was able to reuse 3 shims just need to buy 1 and put everything on the loose limit.
Everything was going so well til I dropped 1 shim
. I was able to retrieve the shim with a little help from this magnetic pickup tool it wasnt easy i was ready to tear the engine apart to get it out lol. It's all done now overall it was fun and I learned alot and definitely cover all the holes/passages/nooks and crannies.
Trials
Well-known member
I think I'll just mention here that valves tighten with wear as they embed into the valve seat and your clearances become slightly reduced with time. The friction wear on the parts that move the valve are suppose to be almost insignificant unless you have a lubrication problem.
Mad Mike
Well-known member
I've used paper to gap plugs, don't recall using it to check valves. Standard 20 copy paper is dependably .004, cigarette box paper .008 and a business card .01 (2.5x a sheet of copy paper).and yet it has been done.
Some skill may be required to pull off anything that I indicate as being a bush fix
Trials
Well-known member
why, to stop the titanium from rusting?way more important to tighten down all your pinch bolt thingies
You prolly don't know what i was referring to.Here,this will give you a good laugh.
way more important to tighten down all your pinch bolt thingies
Bike Mechanics 101 With Pegassus (For Noobs)
- Never mind the hogwash of buying "stands" worth hundreds of bucks and special lifting devices to work on your bikes, I have picked up a few things I have taught myself. I had not "maintained" my bike for at least 14 months, the battery was water-less, the chain had initiations of what looked...
www.gtamotorcycle.com
Iceman
Well-known member
That's exactly what I would have done. Now all four valves are at the loose end of the specs and won't have to be touched again for a long time.Thank you
I was going leave everything the way it was and reinstall the valve cap couple days ago but figured I have never done this kind of work before and decided to go ahead and swap 2 x intake and 1 x exhaust to 0.05 thinner. It was easy on the cbr250 just pull the rockerarm pin. I was able to reuse 3 shims just need to buy 1 and put everything on the loose limit.
Everything was going so well til I dropped 1 shim
Once you've done all that work I don't see the point in not doing the needed adjustment.
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Trials
Well-known member
I liked this part better: " I've seen excavator arms being greased every morning by the operators "You prolly don't know what i was referring to.Here,this will give you a good laugh.
Bike Mechanics 101 With Pegassus (For Noobs)
- Never mind the hogwash of buying "stands" worth hundreds of bucks and special lifting devices to work on your bikes, I have picked up a few things I have taught myself. I had not "maintained" my bike for at least 14 months, the battery was water-less, the chain had initiations of what looked...
Sometimes they even accidentally get some grease on the pins, bearings and bushings
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