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Post by dickyh on Sept 24, 2015 11:29:24 GMT -5
Don't kill yourself trying to figure out why it happened. Things just like to pop up after you solve them. That's why it says "One problem after another" under my avatar image, because I have been there so many times haha. Sometimes, well often in my experience, when one thing goes wrong everything wants to go wrong. Murphy's law. Thanks for the encouragement. Since I have no way to get the scoot to a mechanic, I've done everything myself from day one and have been proud of myself for figuring most things out, of course with some help from the fine folks on the boards. |
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Post by lain on Sept 24, 2015 11:44:27 GMT -5
I have never seen a cam like that. I would guess the lines would be what lines up with the engine casing/head. I would watch the ramps on the cam to see when the ramps are between in/ex, like you can see both ramps there but neither of them are pushing the tappets yet. And if the lines line up with the casing I would say that is tdc. You just have to try some stuff out and see if it looks good. Maybe the entire problem is figuring out this cam, because even if it's 1 tooth off it can cause it to not start/run.
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Post by pistonguy on Sept 24, 2015 13:30:33 GMT -5
Thanks all for your input. I'll be putting new top end on this weekend and see if this solves the problem, although now, I guess from some posts from more experienced people I didn't have to. Live and learn I guess... What baffles me is that until I set the valve lash wrong, the scoot was working perfectly. Only after I did this, did the problem begin so I could only come to the conclusion I damaged something inside. All the electrical is near new (3 mos. ago) CDI, Spark Plug etc. Put a new stator on about a month ago due to charging issues, but nothing else had changed. Well darn it its apart. was hoping to prevent that as theres nothing wrong, but its your scoot. With a simple barn yard compression test and it would be still together. (thumb over spark plug hole). Was hoping to do the pro thing of systematically fixing your problem instead of just changing parts i.e. parts changers. Well were here. I do have calibrated eyeballs but not much to see from the pics, glad you provided them. Seem's you have parts coming so please ask questions and provide pics, ill try to help you thru and at least knowing that part your good. I want the cylinder cleaned in a specific way, the Circlip position, etc. |
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Post by pistonguy on Sept 24, 2015 13:35:03 GMT -5
Oh hey there, How do the Cam Chain Guides Look? any wear? i.e. grooved to deep grooves were the cam chain rides?
Lets look at Everything and more pics the better.
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Post by cyborg on Sept 24, 2015 13:52:15 GMT -5
yes pics please,,of everything
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Post by cyborg on Sept 24, 2015 14:29:25 GMT -5
i thought i sent this earlier but it got lost somehow,,,anyways what i was going to suggest was get a gasket set a set of rings hone the cylinder if it's good which i'm assuming it is to break the glaze reassemble the beast and fire it up,,,and go riding,,,before the snow starts flying,,but it's a moot point now,,,new parts on the way,,,let's build it up right and get it lit
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Post by dickyh on Sept 24, 2015 14:45:53 GMT -5
again, thanks all, I'll be opening the parts up tonight and will take pics and ask lots of questions!
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Post by dickyh on Sept 24, 2015 18:31:56 GMT -5
lain, pistonguy, cyborgOK, here's an update... as luck would have it, I received my anticipated pkg from scrappy and wouldn't you know it they sent me (2) heads and no piston and casing! Called and they sent out the new pgk overnight, so I'll have it tomorrow. So I've posted some pics of the new head for all to see and give feedback. Until I get the other parts, The only question I have so far on installing this is there anything I should know other than the obvious making sure at TDC? Thanks again to all and look forward to all of your feedback to get her up and zipping along again.  Top Side  Valve side  Intake  Exhaust
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Post by dickyh on Sept 24, 2015 18:56:24 GMT -5
Heres a pic of the bottom cam chain guide which slid out, the top is in place and didn't want to pull it out for fear of not getting it back in.  Chain side  other side |
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Post by lain on Sept 24, 2015 21:06:17 GMT -5
remember where all the little metal guides go. It's important to reinstall how it was. You'll see what I mean when you tear it down. Make sure to install the rings properly and to use a torque wrench to tighten it up in the end. Pretty much same exact procedure as this: www.49ccscoot.com/bbk.html |
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Post by steve on Sept 24, 2015 22:35:45 GMT -5
Piston guy. Pretty sure it was the exhaust valve.
If it was the intake valve, then nothing was likely damaged. I read it as the exhaust valve. I just read it again, and it was the exhaust valve lash that he set far too large.
Just checked his new thread. The exhaust valve blew the seal, and was stuck open.
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Post by dickyh on Sept 25, 2015 6:25:10 GMT -5
Piston guy. Pretty sure it was the exhaust valve. If it was the intake valve, then nothing was likely damaged. I read it as the exhaust valve. I just read it again, and it was the exhaust valve lash that he set far too large. Just checked his new thread. The exhaust valve blew the seal, and was stuck open. I set both large, but I am pretty sure it was the exhaust valve that caused the problem because as I stated earlier, when I took the head off the collar clips for the exhaust valve pretty much came off in my hands. |
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Post by dickyh on Sept 25, 2015 6:26:25 GMT -5
remember where all the little metal guides go. It's important to reinstall how it was. You'll see what I mean when you tear it down. Make sure to install the rings properly and to use a torque wrench to tighten it up in the end. Pretty much same exact procedure as this: www.49ccscoot.com/bbk.htmlThanks for the info. answered a lot of my questions about procedure! |
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Post by dickyh on Sept 25, 2015 6:30:01 GMT -5
Here's a weird question... As I stated I received to heads yesterday with everything installed, both had the spark plug in and both heads that the coil wire goes over seemed to be purposely bent. Is there a reason for this?
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Post by lain on Sept 25, 2015 9:01:06 GMT -5
Here's a weird question... As I stated I received to heads yesterday with everything installed, both had the spark plug in and both heads that the coil wire goes over seemed to be purposely bent. Is there a reason for this? Not sure what you mean, can you take a pic? |
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