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Post by quadrunner on Jul 24, 2013 21:21:02 GMT -6
Ok I am getting ready to adjust the valves on my JCL with the Linhai/Yamaha motor and got all the equipment to do it. Problem is that my feeler gauge does not have the .004 and .005 gauges and the closest one I got is the .006 .
Is that ok to use or should I go get myself a new one?
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Post by alleyoop on Jul 24, 2013 21:28:35 GMT -6
Go to the auto parts store and get a set with .004 and .005 feelers in the set. Make sure the set has those some sets start at .008 which is to wide of a gap.
Alleyoop
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Post by quadrunner on Jul 24, 2013 22:46:21 GMT -6
Damn it I thought I could get away with the .006. Off to the auto parts store tomorrow.
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Post by Barnie on Jul 25, 2013 5:17:12 GMT -6
Quadrunner, I have a 2007 JCL MP 250 with the linhai 257 engine. For 5 years I have kept my valves set at .004 and .006 and have had no problems. But if you would like yours at .005 they do sell new sets at any auto parts store with that size. The set I have shows each blades in thousandths and millimeters. Barnie
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Post by quadrunner on Jul 25, 2013 7:26:56 GMT -6
I've had this feeler gauge set for five years and I use it to adjust the valves on the quads I fix . It's a bit worn down anyway so it's time to get a new one. I have just been too lazy to buy it.
And for the record: whoever came with the brilliant idea of putting the cylinder in such a weird angle on the 257cc engine needs to be shot at dawn or whacked to death with a dead posson. The exhaust valve is in one bad spot.
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Post by fflintstone on Jul 25, 2013 9:12:32 GMT -6
Yup,the exhaust valve is kinda in a bad spot but it actually is easier to reach than the intake valve unless you cut a hole in the battery holder--then it is a snap--good luck,good riding ,fflintstone--
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Post by Barnie on Jul 25, 2013 19:31:54 GMT -6
The exhaust valve is more work to get to as you need to drop the belly pan to have room to work. Like Fflintstone said the intake is very easy to get to if you cut the bottom out of the battery tray leaving a small flange around it and then lay a small pc of plexiglass back in to hold battery. You can take the plastic vent cover off of the cvt case to access the nut on the variator to turn engine over buy hand with a socket to line up ur timing marks. Barnie
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Post by quadrunner on Jul 27, 2013 20:01:06 GMT -6
I adjusted the valves and I think I messed up. Took it for a ride and when it reached operating temperature didn't wanted to idle. Drove home and currently letting it cool down to see if that's the problem, if it idles fine when it get cold then I have to repeat the process again. Damn and that is going to annoying to go through the whole thing again.
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Post by alleyoop on Jul 27, 2013 21:34:22 GMT -6
BUMMER!! What I do is after I adjust the valves BEFORE I put the covers back on I TURN the motor over several times by hand AND RECHECK the GAPS. If I adjusted then at .004 inchs after turn the motor over again I check and see if a .005 inch goes in and make sure the .004 inch feeler goes in. Then I am sure I did not mess up and then I put the covers back on and RIDE BABY.
Alleyoop
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Post by quadrunner on Jul 27, 2013 22:17:41 GMT -6
These scooters are awesome to ride but boy they don't think about maintenance when they make them.
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Post by Barnie on Jul 28, 2013 5:37:10 GMT -6
These scooters look great but more work involved for maintenance is the down fall of having one with a full body on them. It's as much or more work to remove the body as the maintenance is. Once the body panels are off you got it made. Barnie
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Post by fflintstone on Jul 28, 2013 11:00:12 GMT -6
Its a PITA
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Post by fflintstone on Jul 28, 2013 11:12:55 GMT -6
its a PITA to do any work on the engine on these Roketas and JCLs and I don't mind doing it ONCE but when ya got it wrong or a little off,it becomes frustrating if ya gotta go back in again--so I challenge all scooterists to come up with plan to strip down our plastic rides and make it look good,you know,go naked--I don't mind if my ride shows the engine and other parts as long as it don't look ragged or shade treed--maybe we could just leave the bottom panels off...or for instance,I saw a youtube clip ,one guy cut a neat round hole just under the seat of his 250 B to access the spark plug ,with out having to take the plastic panel off the bottom right ...also we cut out a piece of the battery tray to access the top valve--see,surely we can come up with other mods to make it easier--how about it ,folks?fflintstone
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Post by alleyoop on Jul 28, 2013 12:44:01 GMT -6
I would suggest making an access panel on the HUMP LIKE A UNSIDE DOWN U so you can get to the front of the motor easly.
Alleyoop
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Post by quadrunner on Jul 28, 2013 21:48:29 GMT -6
UPDATE
Took off all plastics again, checked valve adjustment, made absolutely sure that it was on TDC, adjusted valves again, checked them TWICE by turning over the engine and put it on TDC, turned it on, let it set at operating temperature and everything is great. But I have one more question.
Where the idle screw on this thing? It's supposed to be idling at 1700 RPM but it's about 250 RPMs off and it idles rough. It was idling at around 1600RPMs before the adjustment.
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..BAD TO THE BONE..
