Junior
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Post by 4950cycle on Sept 2, 2016 23:56:42 GMT -6
This is true Bandito2, I forgot to come back to this thread and tell how. I had to take that aluminum sheet off your left foot rest on. then you can take off the screws that hold the lower skirt off you suggested. Don't forget to take the screw off at the total front of the skirt. Once you have that lower left skirt off an 8 mm socket will take the variator cover off. Then you can do whatever handy work you need to do to the transmission / CVT.  |
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Junior
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Post by 4950cycle on Aug 31, 2016 23:08:25 GMT -6
Sounds good, Glad you are having a good scooter experience. On our, I say our because I am not the only one who got one of these Yamaha clones with a substandard head. The valve seat recedes as time goes on . Making us have to at least adjust the exhaust valve way more than normal. Not that easy to do either. We can't make it go away even with impeccable high quality maintenance. There is nothing we can do but install a brand new Name brand Yamaha 250 Majesty head AFAIK. People that got a 250-300 Linhia powered scooter with one of the good heads (maybe came from a better maker than other heads over in China) don't understand what the big deal is. Their bikes don't give them any trouble. I guess you and your wife are one of those. Or you have a CF Moto (Honda clone) powered scooter to which this does not pertain .
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Junior
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Post by 4950cycle on Aug 31, 2016 22:32:47 GMT -6
Took me a while to get the scoot running good . No sense in worrying about sliders and rollers if the engine isn't even running good. Had to adjust valves and drill a vacuum fitting out that was restricted I believe. I did something right because it runs right again. Anyway, I have the variator cover off and the the variator marked real good. It doe's seem to have a weak spring on the clutch to. I can move it in and out fairly easy. Should it be like that ? A stronger spring would give me real good take off and low speed power. But I don't want it to keep my variator from letting my belt go all the way out either at top speed. But one thing at a time. First the variator check. Tropical storm blowing in right now so probably a couple days of sprinkling rain at least before I can take her out for the variator research. Read more: scooterdoc.proboards.com/thread/13015/gram-sliders-linhia-257cc-260#ixzz4IyRILlsc |
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Junior
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Post by 4950cycle on Aug 31, 2016 22:13:55 GMT -6
Yea, The Linhai's aren't the best in the world. But I like the engine layout better than the CF Moto. And IMO they seem to look like they have a bit more quality than the Honda clones. The actual engine that is. You do have a Linhai. Because they don't make a 300 (278 cc) Honda clone China scoot as far as I know.
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Junior
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Post by 4950cycle on Aug 30, 2016 22:16:38 GMT -6
Please, no lectures. I've been running larger than spec tolerances on my Linhia now for a couple of years with no ill effects and incredibly little if any power loss. And much more ride time in between valve adjustments on these Yamaha clones minus quality valve seats. In fact I run about .006 on intake and .008 on exhaust. I've tested my power on same road, same conditions with my valves set at .004 intake, .006 exhaust and then at .006 intake, 008+ exhaust and have virtually same acceleration and "may" loose 1 mph top end per my gauges. Sorry, It's just the way it is. And now I have finally been vindicated by this scooter repair manual I spoke about in my post above. When I started handling my valve adjustments this way back in the scootdawg days everyone told me monsters would eat me if I did it this way. And I would be sorry  |
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Junior
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Post by 4950cycle on Aug 30, 2016 22:00:52 GMT -6
BTW, The Linhia manual says 0.08mm-0.10mm intake valve clearance, 0.16mm-0.20mm for exhaust valve clearance. Translation for us Yanks is .003 inch -.004 intake , .006 -.008 inch for Exhaust . No wonder us Linhai engine driven scooter guys and gals have to adjust our exhaust valves so often. The typical valve clearance specified by your friendly neighborhood scooter mechanic is .005 - .006 of an inch. for the exhaust. Couple that with the inferior valve seats that recede as miles go by and you have to adjust the exhaust valve sometimes every 500-1500 miles. That is " WAY TO MUCH WORK "  To have the privilege of riding a scooter around. Especially with all the body work that needs to be removed to do it. So turns out it is perfectly OK to adjust your exhaust valve out to .008+ inch clearance. Stay under .009 inch. It will shorten your duration if you go to big. This should maybe double your ride time before it starts stalling at stops needing the valves adjusted again. PS I have a JCL MP 250 A just like a Roketa-54 (Linhai engine) scooter and I have made removable access panels so I don't have to take my whole scooter apart to adjust my valves. Just turned a 2 day job into an hour and a half. Working on and off of course on the 2 day thing. Best thing I ever did ! |
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Junior
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Post by 4950cycle on Aug 30, 2016 20:22:14 GMT -6
Doe's it have a Honda clone engine or a Yamaha clone engine ? The Magnum that is .
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Post by 4950cycle on Aug 30, 2016 0:00:20 GMT -6
While I'm waiting for my fuel pump I'm making a trap door to get to my intake valve easy. I made one years ago to get to the exhaust valve. These Linhia's with receding valve seats (exhaust valve mainly) need valve adjustments often. And since the engine lays down the exhaust valve is accessible from the belly and the intake has to be accessible from under the seat. If you don't make these access doors or holes you would have to take off all the body work just to get to the top and bottom of the cylinder head to adjust the valves. The trick is to make these mods as invisible as possible. We wouldn't want to louse up the beautiful lines of a Reflex clone would we .  |
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Junior
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Post by 4950cycle on Aug 29, 2016 23:34:57 GMT -6
I'm replacing the fuel pump since the float bowl is starving out under wot for any decent amount of time. While I'm waiting for my fuel pump I'm making a trap door to get to my intake valve easy. I made one years ago to get to the exhaust valve. These Linhia's with receding valve seats (exhaust valve mainly) need valve adjustments often. And since the engine lays down the exhaust valve is accessible from the belly and the intake has to be accessible from under the seat. If you don't make these access doors or holes you would have to take off all the body work just to get to the top and bottom of the cylinder head to adjust the valves. The trick is to make these mods as invisible as possible. We wouldn't want to louse up the beautiful lines of a Reflex clone would we . |
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Junior
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Post by 4950cycle on Aug 29, 2016 10:00:58 GMT -6
Hell Ellpee, I can't even find someone on this forum that knows if I can take my variator cover off without removing body parts for God's sake. All these people know is "Twist and go" LOL btw, I'm pretty sure I can take that cover off but not positive. But no one else seems to know. lol (No insult intended, I'm just kind of amazed)
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Junior
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Post by 4950cycle on Aug 29, 2016 9:36:36 GMT -6
Well, after following three separate threads for two weeks or more, all about basically the same thing, my question on Day 1 still remains, and I'll finally ask it: why on earth do you want to race along 5 mph faster on a chump 257cc scooter? (No insult intended, I had one too.) Do you do a lot of Interstate or something? Mine was comfortable at 65, and that was all I needed for anything short of Interstate. As far as the three separate threads thing, I was trying to get some answers. No one ever replies hardly anymore so I went the route of over advertising if you will. And still got next to squat ! Where did all the guys that were experts on these Linhia's go that used to be on like Scootdawg ? Like you, Did they ALL graduate to $ 8,000 scooters and loose interest in these Chink machines ? Just wondering where all the good info went ? And as far as why I want about 5 more miles an hour top end. If I could cruise an honest GPS 65 mph all day I would probably be happy enough with that. But, I am 264 lbs. and 6'2 + , I think about all I could cruise at is 62 mph all day. To many fools around here with big pickups for nothing that want to run over everyone going 70 + mph on these two lane country hwys. . |
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Post by 4950cycle on Aug 28, 2016 23:31:50 GMT -6
My problem was my main jet fell out in the bottom of the float bowl, Holy crap I feel like a total YO Yo. I guess in all the junk I was screwing with that day I forgot to torque the 115 main jet I moved from the new 32 mm carb (trying to get it working) back to the old 30mm carb. Anyway, I got it running good again except for my float bowl running empty often. Seems this fuel pump I bought off Ebay just isn't enough. I will return it. I don't want to go electric fuel pump like a lot of 250 and up guys do. I got another Vacuum Jin Bo Chinese fuel pump just like my last one on the way. Hey, The last one lasted almost 8 years before it quit. That's good enough for me. It is somewhat equivalent to a Mikuni DF 52-21-D fuel pump. But under half the price. I'd like to adjust my valves and pull my cover and mark my variator while I'm waiting for my Fuel pump Read more: scooterrebels.proboards.com/thread/2676/miles-hour-257-linhai-jcl#ixzz4IgvWXpdw |
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Post by 4950cycle on Aug 25, 2016 23:39:14 GMT -6
Finally got my old carb back together and got it back in my JCL 257cc. "THEN" I leave the driveway on a test run and something gets sucked up in the main jet I figure . Blasted up the small hill from my driveway entrance. Ran great for 200 + yards got to the top of the hill and started starving and sputtering. All I can figure is the WOT up the hill sucked a piece of debris right up against the bottom of the main jet I guess. I'm starting to get a complex here. Someone doesn't want me to ride I'm starting to think ? I can't get a block down the road without something lousing up on this otherwise good running scoot. Read more: scooterrebels.proboards.com/thread/2676/miles-hour-257-linhai-jcl#ixzz4IPGhinjD |
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Post by 4950cycle on Aug 25, 2016 23:36:49 GMT -6
No expansion chambers on a 4 stroke engine. Only 2 strokes
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Post by 4950cycle on Aug 24, 2016 22:37:33 GMT -6
I'm a shifter from way back. 3 vehicles in my yard have stick shifts. But I must say I do have a mighty soft spot for a well set up CVT.
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