Howdy all,
OK.. Just realized this is sort of a repeat of a couple of my previous posts, but here is some additional background/update. And, I don't see an option to delete a post...so here it is.
Based on what I read on this site I started out my CT90 to Lifan 125 build using a VM20-273 carb. I was previously settled on a VM22-133, but it was noted that may be too big for the Lifan 125 (and it has been unavailable for a while due to production issues).
So, I used a CT110 intake and exhaust from DRATV. Everything fit well and I was able to get the carb tuned for smooth running from idle to full throttle. Problem for me was performance was more on par with a stock 90, rather than what I expected from a 35cc increase in displacement.
It topped out at about 45 (with a 17/45 sprocket combo) and I wanted more like 55. This is a street only bike with Michelin Pilot tires, and I want to be able to keep up with traffic on 45 posted roads; where most cars go 50 to 55.
My thought was that the engine, which has 26mm intake and exhaust ports, was limited by the 22mm CT110 intake and 19mm exhaust. So, after a few e-mails with VInce/Tbolt for advice, I took a VM26-606 off my trail bike and installed it, along with the "Quiet" pitbike exhaust from Tbolt (26mm ID).
The carb mounts up to the manifold that came with the Lifan 125 (from Tbolt) with frame clearance (though very close to the vent nipples). At my altitude, 5280 ft, I tuned this in with a 22.5 Pilot and 190 Main with the needle clip in the most lean, topmost, position. I am using an UNI filter (though started out with a K&N type...it fell off on a ride and was lost). The muffler is shorter than a stock, but still bolts up to the stock shock mount location.
Runs fantastic. I can get a bit over 55 easily. Most of my riding is in the 25-35 range, and it does great there; with instant acceleration when I want it.
Will likely go to a 185 Main to get the needle clip in a more central position, but for now I am good. Just going to enjoy for a while.
Goob
OK.. Just realized this is sort of a repeat of a couple of my previous posts, but here is some additional background/update. And, I don't see an option to delete a post...so here it is.
Based on what I read on this site I started out my CT90 to Lifan 125 build using a VM20-273 carb. I was previously settled on a VM22-133, but it was noted that may be too big for the Lifan 125 (and it has been unavailable for a while due to production issues).
So, I used a CT110 intake and exhaust from DRATV. Everything fit well and I was able to get the carb tuned for smooth running from idle to full throttle. Problem for me was performance was more on par with a stock 90, rather than what I expected from a 35cc increase in displacement.
It topped out at about 45 (with a 17/45 sprocket combo) and I wanted more like 55. This is a street only bike with Michelin Pilot tires, and I want to be able to keep up with traffic on 45 posted roads; where most cars go 50 to 55.
My thought was that the engine, which has 26mm intake and exhaust ports, was limited by the 22mm CT110 intake and 19mm exhaust. So, after a few e-mails with VInce/Tbolt for advice, I took a VM26-606 off my trail bike and installed it, along with the "Quiet" pitbike exhaust from Tbolt (26mm ID).
The carb mounts up to the manifold that came with the Lifan 125 (from Tbolt) with frame clearance (though very close to the vent nipples). At my altitude, 5280 ft, I tuned this in with a 22.5 Pilot and 190 Main with the needle clip in the most lean, topmost, position. I am using an UNI filter (though started out with a K&N type...it fell off on a ride and was lost). The muffler is shorter than a stock, but still bolts up to the stock shock mount location.
Runs fantastic. I can get a bit over 55 easily. Most of my riding is in the 25-35 range, and it does great there; with instant acceleration when I want it.
Will likely go to a 185 Main to get the needle clip in a more central position, but for now I am good. Just going to enjoy for a while.
Goob
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