Clinician
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Post by prvrbs35 on Sept 28, 2010 0:38:16 GMT -6
The CVT/Clutch seems to be working correctly. I did remove this device from the intake manifold for possible leak. What is this used for?  (photo taken by dannicus) However, I do think it has to do with heat. Went out for a test drive tonight after removing the device on the intake manifold and noted that as the scooter heated up that there was considerable hesitation and jerking as I continued to drive around. I was not able to make the scooter stall but it seemed to try. I am considering to replace the fuel and vacuum hoses since these are original. The hoses looked to be good quality. Also, in mind is to replace the fuel filter. I do not know what else to try. |
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Clinician
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Post by prvrbs35 on Sept 27, 2010 15:14:21 GMT -6
Thanks Rich, I will look into the CVT/clutch as well. What should I look into regarding the check valve from the gas tank? I have the hose from gas tank to PVC canister and then to intake manifold. I disconnected the line from the PVC port to the carburetor vacuum some time ago with increased performance. I left the PVC port open on the canister.
I am wondering. Is it possible to install the camshaft 180° out of phase and still run? Like I mentioned I upgraded about 2000 miles ago and something tells me that I may have done such a feat. When I looked into the intake port, I noticed deposits on the valve. The camshaft has A14 on one side and a smaller hole on the opposite. Which mark should be up at TDC?
Anyway, I live in SoCal and it is way too hot to be working on this scooter right now. May have to wait until tomorrow morning.
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Clinician
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Post by prvrbs35 on Sept 27, 2010 13:49:37 GMT -6
No change during test drive. At stop I pulled throttle to wide open and the engine just dies. Easing the throttle slowly I get jerky hesitation and near stalls.
I forgot to mention that on the night that the engine stalled I noticed some high end hesitation/jerking as well.
I am going to pull the carb off and check for any cracks or leaks.
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Clinician
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Post by prvrbs35 on Sept 27, 2010 13:10:20 GMT -6
Just the other night coming home from work about 6 miles into ride my scoot died upon acceleration at a red light. As soon as I started to give it gas it would start to jerk and then cut out completely. When trying to start the engine back up I would have difficulty getting it started.
I checked the valve adjustment today since it has been about 2000 miles since upgrade and adjustment. I upgraded to new OEM style head (crack=oil leak), 59mm cylinder/piston and A14 cam. Everything else stayed stock. I have been running well except I notice at low end it is like starting in 2nd gear. Once I overcome that, mid to high range is very responsive. The valves were not out of adjustment. The spark plug is a light brown in color.
I have not played with air/fuel mixture setting. However, just before this post I did play with it a bit. I will go out for a test drive to the post office shortly after this posting.
I am just a little baffled at to why all of a sudden I am getting the jerking at acceleration from a stop where it kills the engine. I use this scooter as my daily commuter and have just over 8000 miles logged. Sorry for being wordy.
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Clinician
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Oil leak
by: prvrbs35 - May 16, 2010 21:53:31 GMT -6
Post by prvrbs35 on May 16, 2010 21:53:31 GMT -6
I have 2 Chinese Znen scooters. One is a no name import and the other is a savaged Lance that I use for parts. Hence, the extra cylinder head. It seems like that this crack is common. I have read about this on other boards as well. When I look inside the cam well, there looks to be a crack that may be related to the mounting location of the lower 8mm bolt.   |
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Clinician
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Oil leak
by: prvrbs35 - May 16, 2010 17:36:16 GMT -6
Post by prvrbs35 on May 16, 2010 17:36:16 GMT -6
I have been battling an oil leak for weeks. I have tried different gasket material before going with an o-ring (2-159) for the valve cover. Prior to the o-ring installation I had a stock seal which appeared to seal well.
I removed the plastic shrouding and fired up the scoot. I noticed oil at the bottom area of the cylinder head on the cam side. Wiped down the head and right before my eyes I noticed what looked like a dark hair appear. A hair line crack in the head. Just like what ootscoot said, a hairline crack in the cam chain well.
I have another scooter that is inoperable. I took the head off it. There appears to be a crack inside the cam well on this one too. I changed it out anyway. I will see how long I can go on this one.
Maybe it is time to go aftermarket big bore kit. I hope the heads are better constructed.
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