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| 150cc GY6 and Under Engine Tech GY6 and Smaller Technical Discussion Forum |
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#1
01-23-2013, 07:25 AM
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Hard to start? Bad Idle? Don't forget to check your valves.
Just a reminder that it doesn't hurt to check your valve clearance everyone in a while. I recently had a scooter in the shop the other day. This is one that I sold new and it was probably the best running one I've ever had so when the opportunity came to buy it back, I did. Would only run for a little bit and then it would just shut off. At first acted like it was running out of fuel. However, attempts to give it fuel (carb cleaner) would kill it faster. At a loss, I even replaced the carb. Same dang thing. Then I remembered that bad valve clearance can make engines to weird things. Pulled the cover and sure as heck there was 0 lash on the exhaust side. Set both valves, fired right up purrs like a kitten.
So...if you have one that is real tough to start and just won't idle, and its never had the valve clearance checked, check it. These aluminum heads can be soft. Use causes the seat to raise and takes out the clearance and causes it to run like crap. |
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#3
01-24-2013, 08:35 AM
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Whats the proper lashing? .004 on both?
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Trailmaster XRX 150  TK Variator and 1500 Spring  SYC Performance Ported & Polished & Shaved 2 Valve Head, A-10 Camshaft, R2C Filter, and Hammerhead Exhaust  Hammerhead 250GTS White Torque and Clutch Springs, 18g Rollers, R2C Filter, Ported Polished and Shaved Head, Hammerhead Exhaust |
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#4
01-24-2013, 08:44 AM
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.004 is what I set mine to.
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#5
01-24-2013, 06:41 PM
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u set ur valves at tdc correct?
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#6
01-25-2013, 05:12 AM
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Yes, they have to be set while the piston is TDC
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Trailmaster XRX 150 TK Variator and 1500 Spring SYC Performance Ported & Polished & Shaved 2 Valve Head, A-10 Camshaft, R2C Filter, and Hammerhead Exhaust Hammerhead 250GTS White Torque and Clutch Springs, 18g Rollers, R2C Filter, Ported Polished and Shaved Head, Hammerhead Exhaust |
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#7
01-25-2013, 07:20 AM
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has to be TDC on the power stroke. For mine, I just watch the cam lobe individually and make sure it is on the back side. Set it and spin it around till the other one is the same and set it and be done.
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#8
01-25-2013, 06:39 PM
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yeah i was just making sure because thats how i do mine
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#9
01-26-2013, 05:20 AM
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.004 on intake and exhaused i will remember this. when torquing back on the valve cover bolts what ft.lbs do you use?? 7,,8,,9... thanks in advance...Eddie.
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