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Post by austin on Aug 28, 2015 13:52:43 GMT -5
Sorry for the slow reply. My father passed away in the time I was going to change the cylinder and such. That caused a delay. Anyway - I changed the piston, rings, and cylinder. I put it all back together and changed the fuel filter and oil. It runs now. It doesn't smoke and doesn't make any noises that sound odd. Now just to change my gear oil so I can go for a short ride.
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Post by steve on Aug 29, 2015 16:01:06 GMT -5
Sorry about your father. I hate to hear that.
I am glad you got her running. The parts are so cheap that it is not worth trying to mess around with trying to fix a head, or the cylinder. You did the right thing by just replacing it. I've learned the hard way on all this stuff. Ride safe, brother.
Can you tell a difference in power with the 44mm piston?
My prediction: you are going to like it so much that you are going to put a 47mm on there within 6 months. hehe
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Post by austin on Aug 29, 2015 19:06:45 GMT -5
I like it so far. I haven't gone top speed yet. I was going to wait until it broke in a bit first. It seems to have more power; however, the acceleration is lower. That is probably because I have a slightly lower octane fuel in it right now. I've only gone around 15 miles. I was going to check the torque on the head bolts before my next ride. I'm also installing a new fuel guage sensor because the old one went out on me long ago. >_> The original one only lasted like 2 months.
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Post by steve on Aug 29, 2015 19:25:48 GMT -5
The acceleration is worse? That doesn't make sense. At all. Acceleration increase is what larger bores accomplish. Top speed stays the same. That is mostly in the gearing in the rear end. Lower octane fuel doesn't really affect acceleration.
The fuel sending units are notoriously bad. I've gone through 2, and now I just stopped replacing them. Good luck.
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Post by austin on Aug 30, 2015 14:13:57 GMT -5
Well, I could be mistaken about the acceleration. I haven't been able to ride it in like 2 months, so I may be fuzzy about what it was like before the upgrade. Edit: Just wondering - I set my valves both at .004 inch according to several recommendations I found across the web. Is this acceptable in your opinion? steve |
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Post by steve on Sept 2, 2015 17:38:24 GMT -5
Yep. That's fine.
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Post by austin on Sept 4, 2015 13:59:46 GMT -5
steve Well, now the problems start. It was running fine. It started acting up a little after about 30-40 miles (maybe km as the main denomination on the speedometer is km/h). It actually broke down today. It started having little power and slowed down until it stopped roughly 5 seconds later. It would restart and die upon cranking up. I decided not to try it and brought it home with a trailer I borrow from a friend. It doesn't appear to have any oil leaking anywhere and it had new oil, gas, gear oil, and fuel filter put on it when I rebuilt it. Any clue what I should check first? I was going to run a compression test once it cooled down some. EDIT: I ran a compression test. It is roughly the same (maybe a little lower, but not a lot) as it was after I rebuilt the top end. I checked the spark plug and it appears to be a little white, which I think means I'm running too lean. I also checked the oil level and the oil level dropped a decent amount from what it was when I changed it a few days ago. So I believe it is running lean and is blowing too much oil from the vent. It isn't leaking oil anywhere I can find after I inspected it, so my guess is the vapors are being caught in the air box or blowing into the air somehow. I haven't checked the airbox yet; however, the crankcase vent hose was disconnected. I know for sure that I reconnected it, so my guess is the pressure blew it off somehow.
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Post by millsc on Sept 5, 2015 15:12:14 GMT -5
I say go big put the biggest baddest thing that will fit on these scoots. Parts are fairly cheap and even the crank isnt hard to change. Ive been dealing with 50 and 52mm kits for years as a side job and have done hundreds, only had two cases of crank bearing failure both tao tao by the way.
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Post by steve on Sept 11, 2015 12:04:55 GMT -5
A few things to check: Check that your valves are adjusted to right setting. White spark plug means you are running lean. Put an  main jet in there. I would just get a new carb, and an jet. You did blow the vent hose off. If I had to guess, I would say you are getting excessive blow by. How did you put the rings on? Did you stagger the gaps? It sure sounds like the gaps are lined up. It's a total pain, but I would get a new cylinder, AND a new head, and totally rebuild the top end. New carb, too. Get a 20mm carb, and an jet. It will run much smoother with the 20mm carb. |
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Post by austin on Sept 16, 2015 1:31:03 GMT -5
The ring gaps are not lined up. I made sure they were facing different directions. If I had to guess, I'd say the gaps are equally spaced apart like many of the digrams I could find. I believe I found the cause of the crankcase vent hose getting blown off. It was partially blocked, so I think the pressure just built up and forced it off.
I rechecked the oil with the scooter on the center stand and it appears to have remained normal since I unblocked the vent hose. I did get a new carb and air filter as well. I still need to check my spark plug now and see if it is still lean. I'll update this post once I perform that task. Thanks for all of the help!
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main jet in there. I would just get a new carb, and an