11-01-2020, 11:37 PM | #1 |
Join Date: Apr 2020
Location: SLC, Utah
Posts: 83
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Kp-Mini Self-Destruction [Build]
Alright, following the death of my hellcat project, I needed to heal my heart.
My younger brother has a KP mini, and we tricked it out with BRT parts. 36/31mm ported head, hardened valves, stiffer springs, upgraded cam, 70mm piston and matched cylinder, PWK32. It is one dangerous machine. I... really like the counterbalanced engines. After coming from the vibrations and inevitable transmission failures in the ZS190, I was ready for a change. Enter, 2021 KP Mini! In white, of course. Anyway, the 223cc is awesome. No question. That bike has about 20-21hp and gobs of torque. But... is it really enough? No, no it is not. While mini shopping, I found the Tianda TDR300. It's a little small displacement affordable race bike. That, of course, lead me to researching the engine. Apparently it's a Zongshen 300 with 6 forward gears pushing 25-28hp. Six gears... 20% power increase... mini bike? More than double the stock power? What? And it (in theory) fits? Whaaaat? I sat, and I stared, and I soul-searched for a good 28 hours. Then I ordered the engine. What is impulse control? Idk, still trying to figure that out. But there are some complications.
So far I have ordered: - Engine - Bike (thanks to Pete @ Kronik, who it would appear threw in free rearsets) - MT-15 rear shock. It is a bit short, but thanks to a gentleman on facebook, it can easily be raised by altering the wishbone geometry in the suspension linkage. Drill 2 new holes, attach T-piece there instead of lower original hole, gain 2 inches and preload reduction. I need to get the bike into the kitchen (where it's warm and good things are made) as opposed to a 3rd party garage where it currently resides ("Hey fam, can I use up about 2 foot by 5 foot in your garage?"). Engine comes with a PWK34. Will have to see what the quality looks like, might spring for a Nibbi or faux-Sudco. Gearing is similar to the stock KP. One exception is first. The 300CC has a 2.56 ratio as opposed to the 3.077 in the lifan. Primary reduction is also reduced on the 300cc at 3.09 compared to the Lifan's 3.35. Final drive is .938 Lifan and .857 on the Zong. Shouldn't be gearing limited at all. It looks like many of the top end parts are related to the NC250. This makes me wonder if some of the performance parts from one of the guys around here would work. I am trying to find specifically a worked head or high comp piston (though at 10.5-10.7 it is already a tad elevated). My goal is to break the 30hp barrier in a Lifan KP Mini. Is it smart? No. Can I recommend it? Not yet. But it should be a fun challenge. |
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