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Post by 4950cycle on Aug 26, 2016 22:14:42 GMT -5
That's what made me scratch my head , The carb was clean when I closed her up. I even found a super fine wire to run through the tiny hole in the pilot jet. And all other things I am supposed to clear and clean while doing a carby. I never had a chance to check the situation out once I got it home because it got dark on me. Feel kinda stupid. It looks like my new fuel pump quit or I pulled a vacuum line somewhere wrestling the carby in there. Tomorrow I will pull the right floor panel and side panel to get to the fuel pump to see whats uip.
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jmkjr72
contributing staff
Commander 132nd Northern Cav. Division
Posts: 2,779
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Post by jmkjr72 on Aug 27, 2016 4:28:45 GMT -5
If your getting lots of junk in the carb what color is it. If it's black replace all your fuel line. Even the big boys are getting cheap with their fuel line and say I g run non ethonal fuel
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Post by 4950cycle on Aug 28, 2016 22:40:09 GMT -5
Thanks for the info but actually my fuel system is very clean , tank to float bowl. Just got lucky I guess. My first 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 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.
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Post by 4950cycle on Sept 1, 2016 19:16:53 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 single large spring on the rear clutch pulley too. 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 to full diameter 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#ixzz4J33ahFYh
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Post by 4950cycle on Sept 16, 2016 21:39:36 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 Rebel on Sept 16, 2016 22:49:09 GMT -5
Have you thought about a slightly longer belt.
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Post by 4950cycle on Sept 17, 2016 10:51:49 GMT -5
Yes Reb, And for right now until I notice something I haven't yet the actual variator by itself can not squeeze and drive the belt to the extreme outside of the sheave /pulley until you change the things that are preventing it from doing so. Longer belts or heavier weights can not make the belt go out any farther that it does right now. But I fixed it (the variator) yesterday afternoon and now it can contract all the way to drive the belt as far as it can go for the tallest ratio it can achieve. " Now " in the next couple days I will find out if belt length is an issue also as you are saying. Thanks for the feedback Reb. .
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Post by 4950cycle on Nov 4, 2016 22:55:35 GMT -5
Have you thought about a slightly longer belt. I might like to follow your idea here. I have an 856 belt now. What would would be a good measurment (belt number) to try next ?
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Post by Rebel on Nov 4, 2016 23:48:50 GMT -5
I would just go up a small amount in length.
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Post by 4950cycle on Nov 8, 2016 10:11:12 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#ixzz4KTB0Gje4JCL MP250A Lihai 257cc powered / This is how it all ended up here. This info is not for a 50cc-150cc scooter. They are a different animal in some ways to the Yamaha 250 / Linhia powered scoots. I have come to the conclusion that my 257cc Linhia will not go any faster on the top end without a meaningful power upgrade. Like a "real" 295 cc (300) cylinder / piston change plus maybe a little upjetting ? It just dosn't have the torque in its present form to go any faster than 68 mph with my 270 lbs , head right up in the wind resistance situation. I don't care what I do to my variator it just can not change this fact. But I have learned a lot about what works and what is a waste of time. #1 Forget about a bigger or a performance carburator if you don't improve your flow in some meaningful way ie: porting your head and exchange some torque for HP , And get an open / noisy exhaust and and lets not forget a performance pod style airfilter, also more noise. Yes , your intake makes noticable noise with no airbox. " It will sound faster " with just a pod airfilter and a more free flowing exhaust, But in reallity the numberes will change no more than slieghtly if at all. But if you are young and like to be noticed this may have some value. #2 Variator changes gave" ME " (big and heavy) no more top speed. But if a rider is much lighter than 270 lbs. this is what you want to do. #1 On the variator improvment, Shorten your variator boss by 1 1/2 mm do not exeed 2 1/2 mm shorter than stock or your belt will almost climb off your variator at top speed. This will allow your variator to reach its full out high gear. In stock form they stop short of this. #2 on the variator improvement, Exchange your 14 gram rollers for 11 gram "sliders" This will give you everything this motor can offer (with the boss mod too) IMO. I have four 12 gram sliders and four 11 gram sliders. This is what I personally want because I am going to get more power in this engine in the near future. But number 2 will keep you in the higher RPM for maximum excelleration and number 1 will give you full top end capibillities. You can get the best of both worlds like this. Read more: itistheride.boards.net/thread/9619/mph-more-great-257cc-linhai?page=5#ixzz4PQde3hJC
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