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General Discussion / K-pipe jetting and a new air intake
« on: August 02, 2019, 03:11:12 PM »
Hello all. I was wondering if anyone had messed around with k-pipe jetting and/or using a high flow air intake?
I was messing around with my 49cc Tomos moped recently and I was surprised at what a huge different a new air intake, exhaust, and jetting made on the system. It's such a small engine that I didn't think it would need much in the way of air flow and exhaust flow. It has a stock #55 main jet but with the new air intake and exhaust, I couldn't even get it past 15mph with a #58 jet because the mixture was too lean! I had to jump to a #62 jet to even get it to go to second gear. From reading some forums, I think it will need a 64 or higher jet which I unfortunately do not have yet. I have read that the Tomos can increase in speed and power by going to a #58 get even with the stock equipment.
I was thinking that the K-Pipe may be under jetted as well in order to limit its speed and increase its fuel economy. It's odd that the k-pipe engine is so low revving and low power despite being a small displacement engine. Other similar 2 valve engines like the Honda CB125r get 14hp at 10000rpm while the k-pipe only gets 8 at 7000rpm. I think this low level of performance is an indicator that something is restricted on these bikes and I would like to remove those limitations.
I was wondering if any of you had messed around to jetting and/or air intake changes? What are your opinions on the stock air intake?
I was messing around with my 49cc Tomos moped recently and I was surprised at what a huge different a new air intake, exhaust, and jetting made on the system. It's such a small engine that I didn't think it would need much in the way of air flow and exhaust flow. It has a stock #55 main jet but with the new air intake and exhaust, I couldn't even get it past 15mph with a #58 jet because the mixture was too lean! I had to jump to a #62 jet to even get it to go to second gear. From reading some forums, I think it will need a 64 or higher jet which I unfortunately do not have yet. I have read that the Tomos can increase in speed and power by going to a #58 get even with the stock equipment.
I was thinking that the K-Pipe may be under jetted as well in order to limit its speed and increase its fuel economy. It's odd that the k-pipe engine is so low revving and low power despite being a small displacement engine. Other similar 2 valve engines like the Honda CB125r get 14hp at 10000rpm while the k-pipe only gets 8 at 7000rpm. I think this low level of performance is an indicator that something is restricted on these bikes and I would like to remove those limitations.
I was wondering if any of you had messed around to jetting and/or air intake changes? What are your opinions on the stock air intake?