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Post by dude on Jul 19, 2015 18:00:17 GMT -5
Did your bbk come with a head? Different vavle length? Compression test?
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Post by scooternub on Jul 19, 2015 18:09:25 GMT -5
Did your bbk come with a head? Different vavle length? Compression test? yes came with a head. dunno bout it being different but i think the bbk head valves are 64mm. dont think he did a compression test.
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Post by encephalon on Jul 20, 2015 13:43:12 GMT -5
My question is why do either? But what I find really astonishing is after being told his work resulted in a dramatic drop in performance, when that is the opposite effect it should have had, he let it back out of his shop. That gentlemen to me does not resonate reputable. I think what the OP meant was that the mechanic purposefully set the cam off by 1 tooth either way to check to see if it was indeed TDC. The poor performance shown by that test proved that it was indeed timed correctly in the first place. Just what I understood out of that anyway. The fact that he put it back to the correct timing however, is beyond me. lol.
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Post by encephalon on Jul 20, 2015 13:45:23 GMT -5
Did your bbk come with a head? Different vavle length? Compression test? yes came with a head. dunno bout it being different but i think the bbk head valves are 64mm. dont think he did a compression test. Humanshield did multiple tests and things to find out that the BVH actually lowers compression. Sometimes enough to give poor performance.
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Post by frank50e on Jul 20, 2015 20:05:11 GMT -5
It's either timed correctly or not,Easy to tell. But letting a poor work product out of your shop is inexcusable
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Post by scooternub on Jul 25, 2015 10:24:40 GMT -5
scooter1 with photos. same "identical" scooter two, lines tdc for flywheel n cam. And I was right, I am just quoting myself. I will take it back. and explain to him, whats going on. As far as what I know, from reading here. What was odd was is that, when he took the valve cover off, I watched him during this process, he turned the crank shaft till valves were both free from contact from the arms. Which took the cam shaft holes three lined up. I asked him to check the fly wheel, see if it was on the T mark "TDC". It was off. Turned the fly wheel to the T mark, now the cam shaft holes were diagonal. So he went with his expertise not going by the fly wheel TDC, but by lifters being free of contact of the arms and I seen the 3 holes on the cam line up when he did this process. Oh yea, he used a special marker and marked the timing chain and cam. For this I have no idea whats really going on.
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Post by Availien on Jul 25, 2015 10:26:27 GMT -5
From what I see in the picture, that timing is terribly off.
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Post by scooternub on Jul 25, 2015 10:56:10 GMT -5
From what I see in the picture, that timing is terribly off. so its runs. and starts fine. a different mechanic next weekend, we r going to try and fix the tdc fly wheel to match the 3 holes of the cam. how can this be? that it runs n all just fine?
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Post by 90GTVert on Jul 25, 2015 13:02:02 GMT -5
One of mine started and ran over 20 degrees off. Ran crappy... about 30-35MPH with a big bore kit... but it ran.
I'd want to line the flywheel up so it should be TDC and find out where the piston really is. I said the same thing about a week and a half ago back on page 1 though.
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Post by scooternub on Jul 25, 2015 14:21:50 GMT -5
One of mine started and ran over 20 degrees off. Ran crappy... about 30-35MPH with a big bore kit... but it ran. I'd want to line the flywheel up so it should be TDC and find out where the piston really is. I said the same thing about a week and a half ago back on page 1 though. yup thats what this new mechanic wants. find out where the piston lands. brent i jsut want to thank u a bunch for the help. btw i adjusted the valves myself yehaw. not to shappy. for now till me n dood digs into it. she does not sputter or anything. runs good. but yea me n dood are going to tear it apart. find out what is going on. i think he said he wants to remove the cam, and adjust it to fit T. or something like that. im no mechanic so ill see what thia guy can do. what can i lose lol.
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Post by Availien on Jul 25, 2015 15:25:22 GMT -5
Basically the valve head will have to come off to expose the piston. Then you'll want to turn the flywheel to align the "T" and tab and look at where the piston sits. If the piston is flush with the top of the jug then "T" is truly Top Dead Center. Then you'll go from there when installing the cam. I would put money on it running better once you get this done. Your bike is not breathing correctly at that setting in the picture. The valves are not in sync with the intake and exhaust of gases.
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Post by scooternub on Jul 25, 2015 15:45:57 GMT -5
I installed the 1k clutch springs and 1k contra spring. I had to take those dr pully horse shoe things out, they kept locking up the cvt function.
Well guys, guess what? still 33mph.
For a bbk, all you do is install it. thats what the guy did for me. all he did was installed it as is.
I am so fucking mad/frustated/pissed off, what the fuck is stopping me from doing the original 40 mph?
Anyone interested in buying a scooter for 25 bucks and another scooter for 150?
I live in indiana, just pm me.
I am done with this.
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Moat
Scoot Member
Posts: 88
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Post by Moat on Jul 26, 2015 2:00:23 GMT -5
Basically the valve head will have to come off to expose the piston. No reason at all to pull the head. One could get a ball-park piston TDC to compare to the flywheel mark using a piston stop and (crude from cardboard) degree wheel, a dial indicator with a roller tip, "feel" for it with a wood dowel/pencil/popsicle stick - even visually, with a good flashlight, may get ya' what you need to know. All sorts of possible ways to confirm without any major dis-assembly. Bob
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Post by usmcdoc on Jul 27, 2015 13:43:14 GMT -5
scooter1 with photos. same "identical" scooter two, lines tdc for flywheel n cam. And I was right, I am just quoting myself. I will take it back. and explain to him, whats going on. As far as what I know, from reading here. What was odd was is that, when he took the valve cover off, I watched him during this process, he turned the crank shaft till valves were both free from contact from the arms. Which took the cam shaft holes three lined up. I asked him to check the fly wheel, see if it was on the T mark "TDC". It was off. Turned the fly wheel to the T mark, now the cam shaft holes were diagonal. So he went with his expertise not going by the fly wheel TDC, but by lifters being free of contact of the arms and I seen the 3 holes on the cam line up when he did this process. Oh yea, he used a special marker and marked the timing chain and cam. For this I have no idea whats really going on. 2 things.. 1. Yes your timing is way off.. 2. See that orange 'performance' CDI? Every time somebody has me put one of those in for them...starting is hard and they actually lose top speed. I think those just suck and are a gimmick..either that or their QC is non existent..
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Post by scooternub on Jul 27, 2015 14:16:53 GMT -5
i dunno what to do with it. its the reason im selling it. i bet its a minor fix. that orange cdi ran just fine with the stock 49cc. 40-43mph
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