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Post by lain on Dec 26, 2014 19:51:49 GMT -5
Most all auto parts stores have loaner compression gauges. Still sounds like timing might be an issue; the spark going off at a time in the cycle that slaps AGAINST crank rotation. What camshaft are you using? Not sure, the stock cam that came with the 50cc engine before I installed the BBK, I do remember there being almost some sort of kickback with the 50cc engine as well. It is most noticeable when using the kickstarter and it would kick my foot back up partway through the kick. With the BBK it was very hard to use the kickstarter, I would have to put a lot into kicking it but it did usually start first or second kick as long as I didn't slip off of it which I did a lot of the time because of how hard it was to kick, and also why I think the kickstarter got stripped in the freezing cold. I'll have to look into a compression gauge then, but how would I fix it if it IS too much? How much compression should a 50mm BBK have? |
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Post by rcq92130 on Dec 26, 2014 19:59:44 GMT -5
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Post by lain on Dec 26, 2014 19:59:52 GMT -5
Looking at cams now, I'm still not sure which exact one but I was just wondering, is it possible for the gear the teeth are on to move slightly so it is not in line with the bumps anymore and therefor give a false TDC?
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Post by rcq92130 on Dec 26, 2014 20:02:58 GMT -5
Unlikely - the chain is pretty tight (unless your tensioner failed).
Easy to check:
Here is a good video on both tappet clearance adjustment and cam timing adjustment.
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Post by rcq92130 on Dec 26, 2014 20:04:39 GMT -5
Sorry - were you asking if the FLYWHEEL had moved so the indicator for TDC was not showing it correctly?
Not unless someone took the flywheel off and mounted it wrong.
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Post by lain on Dec 26, 2014 20:13:35 GMT -5
Actually I was asking about the cam, you know how there is the gear attached to the shaft that the bumps that operate the valves are on? When I first installed the BBK I noticed there was a notch on the shaft of the cam right where the gear is, and it looked like it was the real TDC, then a few days ago when I opened the valve cover to look at everything I noticed the notch looked as if it had moved a little bit and was even further from pointing towards the big hole on the gear than before.
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Post by rcq92130 on Dec 26, 2014 20:50:53 GMT -5
I believe it is impossible for the cam to have repositioned. If the timing is off the most likely cause is simply that the timing is off.
The video is pretty good in showing all of this.
ps: the 'bumps" are called 'lobes'.
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Post by geh3333 on Dec 26, 2014 21:15:09 GMT -5
Also have actually tested the battery as you were cranking the scoot over ? My battery would read over 13.8 v after charging but after I cranked it a few times it would drop significantly. It could be a timing issue and it could also be a compression issue. This is what sucks about being so far away and not being able to get your hands on it. There are many different reason why this could be happening . didn't you say u ordered a new head and rings ? Also if that is so you do know u need to hone the cylinder when changing rings right ?
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Post by geh3333 on Dec 26, 2014 21:17:02 GMT -5
Also have actually tested the battery as you were cranking the scoot over ? My battery would read over 13.8 v after charging but after I cranked it a few times it would drop significantly. It could be a timing issue and it could also be a compression issue. This is what sucks about being so far away and not being able to get your hands on it. There are many different reason why this could be happening . didn't you say u ordered a new head and rings ? Also if that is so you do know u need to hone the cylinder when changing rings right ? How long have u had the battery ? |
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Post by lain on Dec 27, 2014 3:53:58 GMT -5
Also have actually tested the battery as you were cranking the scoot over ? My battery would read over 13.8 v after charging but after I cranked it a few times it would drop significantly. It could be a timing issue and it could also be a compression issue. This is what sucks about being so far away and not being able to get your hands on it. There are many different reason why this could be happening . didn't you say u ordered a new head and rings ? Also if that is so you do know u need to hone the cylinder when changing rings right ? How long have u had the battery ? About a few months. idk, the battery works fine to operate a 12v impact wrench I have so I wouldn't think the starter would have issues getting power from it since the wrench takes up more power without issues. I've never let the battery charge drop below maybe half, except when I am trying ot get it started and it won't start and I have to use it a lot. I usually bring it in on cold days and charge it to keep it topped up and keep it out of the cold when I am not using it. Not sure what you mean by hone, is that the thing where you do the crisscross pattern on the cylinder walls? |
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Post by geh3333 on Dec 27, 2014 4:03:47 GMT -5
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Post by lain on Dec 27, 2014 4:17:53 GMT -5
Gah tools are expensive haha, couldn't I just use sandpaper? I have tons of sandpaper. Also more ont he battery, whenever I try to start it with the bad electric starter now it seems like the inside of the starter is arcing inside or something because when I try to use it it dims everything, but the battery seems fine with other high output devices like the impact wrench, so I believe it has got to be a bad starter. I am thinking the positive line in the starter must have come unsheathed and is now rubbing against the shaft and passing the positive to the negative as it tries to start. |
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Post by geh3333 on Dec 27, 2014 4:36:10 GMT -5
Gah tools are expensive haha, couldn't I just use sandpaper? I have tons of sandpaper. Also more ont he battery, whenever I try to start it with the bad electric starter now it seems like the inside of the starter is arcing inside or something because when I try to use it it dims everything, but the battery seems fine with other high output devices like the impact wrench, so I believe it has got to be a bad starter. I am thinking the positive line in the starter must have come unsheathed and is now rubbing against the shaft and passing the positive to the negative as it tries to start. Lol , the honing brushes are actually pretty cheap , like 10 bucks . just need the right size. When it comes to the starter , you say everything dims ? Usually if the lights are ac they will not be that bright as the starter spins the engine due to the stator barely working. Think about it , with an 8 pole stator my headlights are dim until I hit the throttle. |
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Post by lain on Dec 27, 2014 4:43:58 GMT -5
Gah tools are expensive haha, couldn't I just use sandpaper? I have tons of sandpaper. Also more ont he battery, whenever I try to start it with the bad electric starter now it seems like the inside of the starter is arcing inside or something because when I try to use it it dims everything, but the battery seems fine with other high output devices like the impact wrench, so I believe it has got to be a bad starter. I am thinking the positive line in the starter must have come unsheathed and is now rubbing against the shaft and passing the positive to the negative as it tries to start. Lol , the honing brushes are actually pretty cheap , like 10 bucks . just need the right size. When it comes to the starter , you say everything dims ? Usually if the lights are ac they will not be that bright as the starter spins the engine due to the stator barely working. Think about it , with an 8 pole stator my headlights are dim until I hit the throttle. I mean dim, seriously. Like to the point where you can't see them anymore in daylight. I know they normally dim when not running the engine and operating multiple devices, but this was much more than normal dimming. Can I use the brush with a dremel or is it normally you don't need a tool just use the brush? |
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Post by tvnacman on Dec 27, 2014 7:13:08 GMT -5
Lain I agree with what Geh has told you in the last few hours . Your welcome to do things as you wish . Certain things are done a certain way because it gives a positive lasting result . He is not telling you if you just put the rings in without honing it will not run . The question is how long will it run for verses honing ? When you load test an automotive battery , a heavy electrical load is placed on the battery , if the voltage drops while the heavy load is on it they deem the battery no good . In most cases batteries are rated and the heavy load placed on them is based on there rating .
John
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