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Post by 4950cycle on Jan 23, 2017 11:22:39 GMT -6
After all this time no one has ever bought and/or installed this rather expensive mod ? I want to buy and install the big bore kit on my JCL MP250A Linhia scooter engine. But I have absolutely no verification how it will effect my performance. It has been quite a while since I've been looking for the elusive person that may have bought one of these. Still no one has one huh ?? PS Does anybody know if the A9 sport spec cam Scrappy sells (when in stock) will fit the Linhai 260 head ? They don't specify what it even fits ? The cam that is. Read more: scooterdoc.proboards.com/thread/13268/scrappydogs-big-bore-linhai-engines?page=1#ixzz4Wbc6Se3n |
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Junior
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Post by 4950cycle on Jan 22, 2017 1:15:27 GMT -6
After all this time no one has ever bought and/or installed this rather expensive mod ? I want to buy and install the big bore kit on my JCL MP250A Linhia scooter engine. But I have absolutely no verification how it will effect my performance. It has been quite a while since I've been looking for the elusive person that may have bought one of these. Still no one has one huh ?? Read more: scooterdoc.proboards.com/thread/13268/scrappydogs-big-bore-linhai-engines#ixzz4WTGPtNkm |
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Junior
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Post by 4950cycle on Nov 9, 2016 23:30:47 GMT -6
Try a sym citycom?,,,,300cc and top speed over 90mph,,,my friend had one and he raved about it I will research the Sym Citycom and see if it has enough legroom for me. Thanks for the lead. |
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Post by 4950cycle on Nov 9, 2016 23:23:08 GMT -6
One of the main reasons I stay with my MP 250 A is I like the way the center of gravity is nice and low. The second reason is the total weight is managable. I would like to graduate to a Yamaha 400 scooter or a Forza to get more performance. But I don't want to get a heavier machine than I have right now. That is why I came to scooters from big 4 cylinder bikes in the first place. There are faster ,lighter scooters but like the Kymco City they are to small for my 6'3 frame. They have no leg room for anyone over 5'9 for God's sake. Does any of you guys an gals know the wet weight of my scooter or a Yama 400 ? Or do you have any Ideas based on what I have said ? Well, I researched the weight of the Reflex clone I am speaking about and the Roketa Linhia powered 250 scooter is exact same scooter as mine and the sorce I found says GW is 341 lbs. I think in this case GW means wet weight because it also mentions a NW (net weight) of 320 lbs. . . Then found a YP 400 wet weight of 467 lbs.. If this info is true a 400 Majesty is Tooo.. heavy for my taste right now. I am 54 yrs old ex smoker and I can walk my scooter at least 2 city blocks with a couple short breaks if there is a problem. And I wanna keep it that way. |
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Junior
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Post by 4950cycle on Nov 8, 2016 21:10:24 GMT -6
One of the main reasons I stay with my MP 250 A is I like the way the center of gravity is nice and low. The second reason is the total weight is managable. I would like to graduate to a Yamaha 400 scooter or a Forza to get more performance. But I don't want to get a heavier machine than I have right now. That is why I came to scooters from big 4 cylinder bikes in the first place. There are faster ,lighter scooters but like the Kymco City they are to small for my 6'3 frame. They have no leg room for anyone over 5'9 for God's sake. Does any of you guys an gals know the wet weight of my scooter or a Yama 400 ? Or do you have any Ideas based on what I have said ?
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Junior
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Post by 4950cycle on Nov 8, 2016 9:41:16 GMT -6
Its running fine now. The 12 gram DP style sliders are 2 grams per slider less than my stock rollers were. But instead of increasing RPM per speed / mph my RPM decreased ? I was going 67-68 mph with my old 14 gram "rollers" with 6600-6800 rpm . Now with 12 gram "sliders" at 67 mph I'm only revving 6000 RPM ? Thats 500 rpm below my peak HP @ 6500 rpm. I am going to experiment with putting 4 rollers in at 13 grams (I drilled them to 13 grams) each mixed with 4 of my 12 gram sliders tomorrow just to see if I can get the best of both worlds ? If I don't gain any RPM I'm prepared to drill one more gram out of my 4 rollers that are 13 grams now. JCL 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 have the best of both worlds this way. Read more: itistheride.boards.net/thread/9619/mph-more-great-257cc-linhai?page=5#ixzz4PQde3hJC |
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Post by 4950cycle on Nov 8, 2016 9:36:46 GMT -6
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[/quotJCL 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 have the best of both worlds this way. Read more: itistheride.boards.net/thread/9619/mph-more-great-257cc-linhai?page=5#ixzz4PQde3hJC |
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Junior
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Post by 4950cycle on Nov 1, 2016 22:02:07 GMT -6
Its running fine now. The 12 gram DP style sliders are 2 grams per slider less than my stock rollers were. But instead of increasing RPM per speed / mph my RPM decreased ? I was going 67-68 mph with my old 14 gram "rollers" with 6600-6800 rpm . Now with 12 gram "sliders" at 67 mph I'm only revving 6000 RPM ? Thats 500 rpm below my peak HP @ 6500 rpm. I am going to experiment with putting 4 rollers in at 13 grams (I drilled them to 13 grams) each mixed with 4 of my 12 gram sliders tomorrow just to see if I can get the best of both worlds ? If I don't gain any RPM I'm prepared to drill one more gram out of my 4 rollers that are 13 grams now.
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Post by 4950cycle on Nov 1, 2016 21:59:06 GMT -6
Just a thought..... You suspect you're not getting enough fuel at top speed. Try loosening your gas cap and test. Perhaps when you're going balls out its creating vacuum in your fuel tank. Your pump can only deliver as much fuel as your gas cap vent will allow. Tryed your gas cap idea. Even drilled an extra vent hole though the gas cap. "No" It didn't change a thing Zack. But thanks anyway. |
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Post by 4950cycle on Nov 1, 2016 21:32:48 GMT -6
Its running fine now. The 12 gram DP style sliders are 2 grams per slider less than my stock rollers were. But instead of increasing RPM per speed / mph my RPM decreased ? I was going 67-68 mph with my old 14 gram "rollers" with 6600-6800 rpm . Now with 12 gram "sliders" at 67 mph I'm only revving 6000 RPM ? Thats 500 rpm below my peak HP @ 6500 rpm. I am going to experiment with putting 4 rollers in at 13 grams (I drilled them to 13 grams) each mixed with 4 of my 12 gram sliders tomorrow just to see if I can get the best of both worlds ? If I don't gain any RPM I'm prepared to drill one more gram out of my 4 rollers that are 13 grams now.
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Post by 4950cycle on Sept 28, 2016 22:52:28 GMT -6
Is this the reverse trike with the motor you had discribed as a Linhai ( the cylinder points forward and low) /
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Post by 4950cycle on Sept 27, 2016 22:14:36 GMT -6
This sounds familiar to my problem now in 2016. Mine is a 257cc Linhai with a little coil that looks like it is for a 50cc scoot.
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Junior
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Post by 4950cycle on Sept 27, 2016 10:54:49 GMT -6
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Post by 4950cycle on Sept 27, 2016 10:53:52 GMT -6
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Post by 4950cycle on Sept 23, 2016 21:36:21 GMT -6
Makes Sense to me Zack. I will do this if I'm still having problems once I get spark again. Put a coil on it only to get spark only for about 4 minutes of running. Then no spark again. CDI maybe ?
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