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Post by rockynv on Aug 30, 2016 8:06:36 GMT -5
Vespa with the pull out seat bucket makes me jealous at times due to how easy it makes servicing them. One owner I spoke with lamented how hard it was to access things and was shocked when I just pulled out the seat bucket with one hand and exposed the top of the engine for easy servicing. All bikes should be that easy.
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Post by 4950cycle on Aug 30, 2016 20:28:14 GMT -5
Good to here somebody had some sense for a change when designing the Vespa Rockynv. 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 the 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 rockynv on Aug 31, 2016 22:55:20 GMT -5
You should not be adjusting that often unless your running lean and hot or using regular gas. I thought the Yamaha design required Mid grade to Premium to inhibit valve wear.
On my Lance I cut valve wear to about 1/3 when I switched from Reg to Premium. I was riding about 12,000 miles a year then and was adjusting valves monthly at first until I switched to Premium.
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Post by 4950cycle on Sept 1, 2016 0:47:50 GMT -5
Now that's interesting to me. Ya got my attention ! And yes I do burn regular at least half the time Rock. Not now. And I never heard about that Yamaha valve rule you mentioned
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Post by 4950cycle on Sept 1, 2016 0:53:30 GMT -5
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. Read more: scooterdoc.proboards.com/thread/13015/gram-sliders-linhia-257cc-260#ixzz4IyRILlsc |
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Post by 4950cycle on Sept 11, 2016 12:11:22 GMT -5
BTW, Spark plug looks a real dark beige . I would think perfect , a bit, just a bit rich.
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Post by 4950cycle on Sept 11, 2016 12:15:48 GMT -5
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: scooterdoc.proboards.com/thread/13087/257-260-linhia-compression-test#ixzz4Jy3Kih1n |
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Post by 4950cycle on Sept 13, 2016 12:31:57 GMT -5
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 ? Read more: scooterdoc.proboards.com/thread/13015/gram-sliders-linhia-257cc-260?page=1#ixzz4K9kfgdTy |
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Post by 4950cycle on Sept 13, 2016 19:17:43 GMT -5
One danger with the sliders is that on some bikes the belt may ride far enough past the rim of the variator to pull any oil sump gaskets it comes close to out. Not sure about the Yamaha design however on a number of dry sump engines this has been an issue. Simply trimming any excess gasket material sticking out into the belt path off with a razor will many times be all thats required to prevent this. BTW Now that I've taken the cover off the Linhia 257 and up have no oil sump holes connected to or around the variator case. Nothing to interfere with the variator or belt except maybe the case cover. But I can't see it happening. |
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Post by 4950cycle on Sept 16, 2016 21:18:58 GMT -5
Halt on getting sliders or rollers to get more top end on a Linhia 250-300 cc. Turns out the results from my variator marker test ( the point my belt came out to on variator ) is as far as my variator will go for top end. Heavier sliders / rollers can not overcome the mechanical road blocks that are built into my Linhia 257 cc variator after I took a super close look at how it works . "BUT" with some modification to the variator I'm expanding the diameter that it can push the belt out to. So that's why no one would tell me on any of the forums how the slider mod would help or it turns out " Not " help me to get more top end. 15 gram or any other slider weight can not increase top end until you do these couple of simple mods to the variator. Sorry, no pics yet because my camera is down and my cell doesn't take pics, But soon though if anybody is interested. Best of all it cost no $ if you have the right shop tools around. Read more: scooterdoc.proboards.com/thread/13015/gram-sliders-linhia-257cc-260?page=1#ixzz4KTB0Gje4 |
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Post by 4950cycle on Sept 16, 2016 21:47:56 GMT -5
Now going in another direction which would be better acceleration . I would think that could be done simply by going a gram or two lighter on rollers or even better sliders. And I would bet you could still achieve full contraction on the variator which would give you your same top speed as before the weight change as long as you don't go to light on the rollers / .sliders Read more: thescooterprofessor.proboards.com/thread/4569/gram-sliders-linhia-257cc-260#ixzz4KTfWBP00 |
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Post by 4950cycle on Sept 18, 2016 0:56:43 GMT -5
My idea worked on the variator. I worked on it late yesterday afternoon and today. Finally by nightfall tonight I got the modded variator back on the JCL 250 up and running. Well... up and running on the center stand anyway. I wanted to do a static test first to see what the variator was doing and at what RPM. I got my belt all the way out now at about 6600 RPMs I believe. It was getting dark so I didn't see so good even with a drop light. I will redo it tomorrow. I drilled out 1/2 of the 14 gram rollers down to 12 grams. so I have an average of about 13 gram rollers. Truthfully I don't even need sliders now since I'm getting full range with these old beat up drilled out rollers. But I will still buy a set just to complete my refurbishing the variator dealy. The real test is will the belt go all the way out on the variator with my 264 lbs. butt on it. That will be tomorrow to see if I can get any more top end out of it. Read more: scooterrebels.proboards.com/thread/2683/gram-sliders-linhia-257cc-scooter?page=1#ixzz4KaF4iN6n |
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Post by 4950cycle on Sept 19, 2016 10:45:06 GMT -5
4950cycle Well, I gave it a run test and it only gained about a 1-2 mile per hour. And I lost a pinch of my Jack rabbit start / Hole shot ability. Now it gets up to about 10 MPH before it starts really scooting. Don't get me wrong, It's still plenty acceptable on take off. But it really used to jack rabbit out of the hole before. But, Just remember this was the very first test run. And it never attained 6500 rpm where my max HP is. For some reason I couldn't get it to climb above 6000 rpm at top speed. Can't explain this yet since I actually lightened my rollers which should have made me run higher RPM across the board. I did booger the rollers up a bit when I drilled those 4 I drilled. Maybe they are fouling up a bit trying to very my variator. So, Now I'll have to order those 12 gram sliders I had my eye on to see if that will make it all work ? PS I bet it would FLY LOW with somebody 170 lbs or less on it though right now. Remember I'm 274 lbs. and a head into the wind now. Read more: scooterrebels.proboards.com/thread/2683/gram-sliders-linhia-257cc-scooter?page=1#ixzz4KiUk0tXn
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Post by 4950cycle on Sept 23, 2016 23:14:13 GMT -5
JCL MP250A Lihai 257cc powered Lost my spark in the middle of all this. Ok, Got my new coil today. Put it on and it starts right up. I scurry around getting some tools out of the way so I could pull out on the scooter. Meanwhile scooter siting there warming up. All of a sudden scooter just quits. I suspect no spark again , so I check for spark and NO spark again. What the frig is wrong with this PITA ! Check the wires and all is fine there. What next, The CDI ? Read more: scooterrebels.proboards.com/thread/2688/jcl-250a-dash-lights-start?page=1#ixzz4L86ZJivS |
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Post by tortoise on Sept 24, 2016 0:22:11 GMT -5
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