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Post by 4950cycle on Sept 14, 2016 22:22:33 GMT -6
I have the round fuel pump in that pic above. It is in a 2007 JCL MP250A . Although the scooter wasn't bought by me until march 2012. So the fuel pump was at least 4 1/2 to 9 years old. No matter what not bad for an $18 (on Ebay) fuel pump. Anyway Mine had the exact same senario as yours. I screwed with everything as the guys are saying here. Turned out the fuel pump was shot. My advice, Check the fuel pump and vacuum hose that goes to fuel pump first as said above. Then if it pumps fuel then see if you have spark. If you have spark then start checking your carburetor float bowl to clear your jets. If it is hard to get to your spark plug as mine was then check to see if jets are clogged then check to see if it will start then. If not a spark check is in order..
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Post by 4950cycle on Sept 14, 2016 0:25:18 GMT -6
Mine came with a 856 Powerlink. I'm sure the belt will be of quality. Every CVT belt I've seen lately looks like it has Kevlar in it. And is very tough. Now tires, That's another story  |
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Post by 4950cycle on Sept 13, 2016 10:21:56 GMT -6
Got the scooter running good with all new fuel delivery parts. Hoses, Right size pump and such. Carb has no issues and away we go. Did the marker variator test and came up just under a 1/4 inch from full belt Diameter at top speed (67-68 mph right now)on said variator. Hovering around 6700-6800 RPM. Max hp is supposed to be at around 6500 RPM on 257cc Linhia. That being said I think I could go up a gram to 15 gram sliders. BTW My stock rollers are the typical for 250 Linhia 14 gram rollers. If 15 gram sliders make it a bit sluggish (a little heavy) I could always drill a half gram or so out on each slider. Any input Guys ?
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Post by 4950cycle on Sept 12, 2016 21:43:35 GMT -6
Well, I am going to rent a compression tester at Orieley's auto parts. I will check my engine with that one in case mine is giving a false reading. Hey, It happened to me before.
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Post by 4950cycle on Sept 11, 2016 15:37:40 GMT -6
Please read post as far as oil change, But use fossil Castrol. Did not compression test when new. Have antiseize in plug hole. Still scared to do hot test.  Could be valves. Didn't do a wet test. Or could be faulty comp. gauge. Would not be the first time it happened to me. But keep the feedback comeing. BTW , Doesn't blow any noticeable amount of oil. IOW I never need to add any between changes. |
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Post by 4950cycle on Sept 11, 2016 10:50:41 GMT -6
I was wondering I was wondering if anyone's ever done a compression test on their 257 cc Linhia engine ? I did mine today after only 7,000 miles and I only got about 135 psi on a cold compression test. I would have done it motor warm like I am supposed to. But I have had bad experiences messing with aluminum spark plug holes while they are hot. I do engines cold now and still get a pretty good base line compression reading IMO. Seems kinda low to me for a fairly fresh engine though. Any feedback anyone ? PS. I broke engine in by the book. And changed oil every 1,000 miles or so. Read more: scooterrebels.proboards.com/thread/2686/260-linhai-compression-psi#ixzz4Jy0CvwHYg if anyone's ever done a compression test on their 257 cc Linhia engine ? I did mine today after only 7,000 miles and I only got about 135 psi on a cold compression test. I would have done it motor warm like I am supposed to. But I have had bad experiences messing with aluminum spark plug holes while they are hot. I do engines cold now and still get a pretty good base line compression reading IMO. Seems kinda low to me for a fairly fresh engine though. Any feedback anyone ? PS Tes, I broke engine in by the book. And after that changed oil every 1,000 miles or so. Read more: scooterrebels.proboards.com/thread/2686/260-linhai-compression-psi#ixzz4Jy0CvwHY |
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Post by 4950cycle on Sept 9, 2016 14:07:46 GMT -6
Take the left lower body panel off under the foot board. And you have to take that aluminum sheet metal you rest your feet on to get to the lower body panel fasteners. After that I could get to anything I needed to expose the variator and clutch on the 250 Linhai powered Rocketa / Reflex style scooter. Pain in the butt but doable. When I say left side I always mean while sitting on the scooter.
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Post by 4950cycle on Sept 2, 2016 23:26:57 GMT -6
Probably all a micro sprayer is is a Harbor Frieght $15 airbrush ? I have a 1974 CB 125 I wanted to touch up. I had the right mixed color but no way to apply it. So I bought a Harbor Freight airbrush to apply small amounts of paint for touch up.
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Post by 4950cycle on Sept 2, 2016 0:07:05 GMT -6
Sounds like something is slapping or wrapping against something in the clutch area ?
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Post by 4950cycle on Sept 1, 2016 22:37:39 GMT -6
Its either is a match or its not. If it does not match provide him with proof that it doesn't match and ask for your $ back. Small shop or big shop.
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Post by 4950cycle on Sept 1, 2016 18:40:24 GMT -6
I took apart and cleaned my stock 8 yr. old Jin Bo fuel pump because it stopped working a couple days ago . I ordered a new fuel pump of the same make and it showed up today. The old one worked after I took it apart and cleaned it up and the scoot ran good, even at top end. But today I went out to start it up to test my marked variator and the fuel line was dry AGAIN. And I couldn't get it to pump fuel (see through line) as I cranked it over. Then this tropical storm finally got here to north central FL. and stopped the whole show for the rest of the day and probably tomorrow too. It's a real big slow, slow moving storm. When it finally quits I will throw this new fuel pump on and hopefully it will solve my new fuel supply problem. Then I will test my marked variator. I have my JCL all stripped down with my variator cover off even. I can't wait to test it and then pull my variator apart to weigh my rollers to see which way to go on slider weight.. Read more: scooterrebels.proboards.com/thread/2683/gram-sliders-linhia-257cc-scooter#ixzz4J3R6LPYT |
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Post by 4950cycle on Aug 31, 2016 21:31:34 GMT -6
Thank you for all the help here cloudsifter. 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 pulley (rear) 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.
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Post by 4950cycle on Aug 30, 2016 17:57:26 GMT -6
$5 will get you $10 This guys got the Linhai engine. There are two completely different engine styles and before any one can help you we need to know what you have. |
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Post by 4950cycle on Aug 30, 2016 15:06:30 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. 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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Post by 4950cycle on Aug 30, 2016 0:13:55 GMT -6
Just hopped over here from my thread to see what you have for a scooter. After having my Linhai Aeolus 300 for awhile-I went from what mine had in it (14gram)rollers to Dr Pulley sliders at 12g. I noticed improvement (when I did it 2yrs ago) but I wasn't scientific about it. I'm not home right now, so can't quickly find a post explaining regarding going up or down in weights. I could find the video on YouTube in a bit when I get home if it might help, as well. I'm sure the info is in this form somewhere too but not being at home this is the quickest thing I could find in another form using a Google search. www.apriliaforum.com/forums/showthread.php?t=8960 in that thread it talks about the different weights and the purposes for changing. A Honda Reflex clone with a 260 Linhai (Yamaha style engine). |
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Could be valves. Didn't do a wet test. Or could be faulty comp. gauge. Would not be the first time it happened to me. But keep the feedback comeing. BTW , Doesn't blow any noticeable amount of oil. IOW I never need to add any between changes.
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. 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 !