QingQi 200 - Valve Clearance Help Please!
Hi everyone, I am in the UK aand have recently bought a second hand QingQi 200Gy (Superbyke RMR200) with 300Km on th clock for £1000. That was 2 weeks ago and I love it - I have since put another 650Km on it so at the weekend i though I'd give the valve clearance a go, since ChinV's instructions were so thorough....
Anyway, I've run into problems...firstly, I found it very hard to get at the front adjuster since the frame downtube is in the way, but I persevered anyway. Using a feeler gauge, I thought I'd done a good job, so bolted everything back up and fired her up.She started but went clackety , clackety clack - obviously I stopped the engine and concluded tha all i'd done was make he clearances to loose. So I left it a day to calm down, and gave it another go last night. I again used the guage and this time tightened the adjusters down a fair bit, bolted her back up and tried to start her. Now the engine turns over but doesn't fire. I checked that I'm getting a spark, it is fine. I gave it a few more goes, and then looked at the spark plug again - it is bone dry. I belive this means no fuel is getting to the cylinder, and am I right in thinking that this would be result of the inlet valve being too tight, so no fuel is getting through?
Anyway, I think my main issue is that I'm obviously doing something wrong with the feeler guage. I'm mainly confused about how far through the feeler blade needs to go, as when they were too loose, I had turned out the adjuster far enough that a .08 feeler went all the way through - I then tightened them up until they just pinched it. So the second time, I adjusted them so that a .08 half slotted in but would not go all the way through.What am I doing wrong?! I am worried that if I carry on I'm going to damage the engine......
I must add that I have quite big hands and am finding it all a lot more fiddly than i was expecting!
Any help would be much appreciated!
Qingqi QM200GY-BA-Superbyke RMR200 rocker cover
Quote:
Originally Posted by
CrazyCarl
try removing the whole valve cover to get a good look at how the assembly works
CC
Access to valvegear is awkward and it helps to be a contorsionist, but note that the "cover" is not just a cover. It forms an integral and stressed part of the valve gear, the camshaft bearings, and it's also an engine mounting. The bearings are in the alloy itself forming a pair of split plain bearings. Half in the head and half in the cover. Also note that there are two recessed bolts in the cover (the unmarked ones in the diagram) that must not be undone before removing the cover. These are pinch bolts that hold the shafts that the rockers pivots on.
Once removed you have to be extremely careful not to get any dirt in there or you can damage the bearings surfaces and on replacement, careful tightening (in the correct sequence) with a torque spanner to prevent any distortion. The torque figure being 10Nm (7 lb-ft).
A look at the mechanism is all you can do, as, unfortunately, adjustment of valve clearance is not possible with the cover removed. This cover also houses the rocker arms and they come away with the cover...
http://www.lao-japan.com/parts_catal...s/image001.jpg
Curiously enough, failure of this cover casting, where it acts as an engine mounting as well, has caused the only catastrophic engine failure that I've ever heard of on a Qingqi. It seems that there's oil at high pressure in there to lubricate the camshaft and its bearings, and breakage caused a total oil pressure loss and a massive oil leak that ruined the piston and cylinder as well. The rider didn't notice this oil leak, probably wearing boots and heavy trousers (now even more completely waterproofed...):
http://www.telecable.es/personales/a...inefailure.jpg
Qlink XF200 valve failure
Did I say in the previous post that that oily bike was the only catastrophic engine failure I've heard of?.
Wrong I'm afraid. I've just read volksjagger's blog. See entry for Sunday, September 28, 2008 "I Blew Up The Engine". :rolleyes1:
http://xf200qlinksupermoto.blogspot.com/