Hello fellow builders! If you dont like reading skip to the next paragraph. So to start i decided to try taking off the muffler end cap to see what it would be like on my stock YD100 motor. Took it off and the low end torque was increased ALOT which i liked but the bike 4 stroked after 40km/h. Put the cap back on but took it back off again the same day since i got used to the extra torque and hill climbing ability. For the life of me i couldnt find jets for the BoFeng that would ship to me. Looked everywhere in a few different cities but no luck. Was looking around AliExpress and found a Dellorto clone for 8 euros shipped! Ordered it and it arrived a few days ago. One of the reasons i got it is because i can get emulsion tubes and jets from my local Tomos moped parts store. The quality of it was decent and i cleaned it up and put in a 60 jet that i had and tried it. The bike still had good torque if not a bit better, idled better and it started 4 stroking at 45km/h this time so i will have to jet down a bit more... One problem is that i dont have enough clearance to fit the cone air filter (ziptied the stock filter without the red plastic for testing) so here are my questions:
1st: Making the air filter fit i wanted to either modify the stock intake. Read about how extending it with a hose would make me lose some top end power. Would it make that much of a difference on my stock motor and if re-jetting the carb would fix it?
If not that i would try to make a flange out of PVC hoses to put the air filter somewhere in front of the rear fender (3rd picture). Another thing is if intake length from carb to air filter impact performance in anyway?
2nd: As said above i took and kept the exhaust end cap off the muffler because its nice having a bit more low end torque. Anyway the bike is now a lot louder and i dont want unwanted attention drawn at me so could i weld an extension of the header pipe that would go to the rear of the bike and weld a muffler there without losing that low end torque? Also saw some people on here running those really long exhausts (again read somewhere that increasing header length of the stock exhaust increases torque but decreases top end) (4th picture).
3rd: I have a 36 tooth sprocket laying around and thought of using it in combination with the longer intake and exhaust to keep the bike at low revs where the torque is at but also having a good enough speed (about 50km/h) as it was before.
Main thing i want to fix is the noise so some idea about the muffler would be nice. I can live with the zip tied air filter for now and the carb just needs a bit of more tuning.
Wanted to do a lifan 125cc build but i bought another project car so dont have much time or money for all of that on top. But i am planning to make a 3rd bike with an LD100. I helped my friend build a bike with the same kit and his has good torque and still goes about 55-60km/h with the stock 44t sprocket and Bofeng carb. Shame the YD100 doesnt have the same power...
Thanks in advance for the help and sorry for the long write up.
1st: Making the air filter fit i wanted to either modify the stock intake. Read about how extending it with a hose would make me lose some top end power. Would it make that much of a difference on my stock motor and if re-jetting the carb would fix it?
If not that i would try to make a flange out of PVC hoses to put the air filter somewhere in front of the rear fender (3rd picture). Another thing is if intake length from carb to air filter impact performance in anyway?
2nd: As said above i took and kept the exhaust end cap off the muffler because its nice having a bit more low end torque. Anyway the bike is now a lot louder and i dont want unwanted attention drawn at me so could i weld an extension of the header pipe that would go to the rear of the bike and weld a muffler there without losing that low end torque? Also saw some people on here running those really long exhausts (again read somewhere that increasing header length of the stock exhaust increases torque but decreases top end) (4th picture).
3rd: I have a 36 tooth sprocket laying around and thought of using it in combination with the longer intake and exhaust to keep the bike at low revs where the torque is at but also having a good enough speed (about 50km/h) as it was before.
Main thing i want to fix is the noise so some idea about the muffler would be nice. I can live with the zip tied air filter for now and the carb just needs a bit of more tuning.
Wanted to do a lifan 125cc build but i bought another project car so dont have much time or money for all of that on top. But i am planning to make a 3rd bike with an LD100. I helped my friend build a bike with the same kit and his has good torque and still goes about 55-60km/h with the stock 44t sprocket and Bofeng carb. Shame the YD100 doesnt have the same power...
Thanks in advance for the help and sorry for the long write up.
