1. Make your own free flow filter. Make sure you use the cage of the old filter too keep back pressure.
2. Find a bigger kehin or mikini carbie like a 22mm, 24mm or 26mm of any old japanese mini bike. Most the china 110cc and 125 cc have 16mm standard. At tops the carbie might cost you $15 from a wrecker and would be worth every cent.
3 If you know what your doin you can weld or machine the head and or change the head gasket to change the compression ratio.
4. You could run two2cool in your oil which would cost about $3 per change and lowers engine temps which will improve Hp after the engines hot.
5. You can play with the clutch spring / washers depending on manufacturer and make it hit later so that the engine always operates closer to peak hp. Harder springs / washer setups = later hit and thue faster more aggressive auto clutch response. But be warned this mod menas your gearbox and drive / engine parts will last way less time. If your this serious you really should just buy a thumpster as most the above are done.
Its the same principle behind bonnet scoops on high performance cars and turbos.
In simple terms if you provide intake pressure of air and fuel you get a bigger combustion explosion and higher power output from the engine.
By facing the Carb and air filter forward the movement of the bike will act like a very mini turb, particularly at speed. And hence the reason why a foam uni filter is better then the convoluted paper and mesh filter which have a solid end. The solid end would block the best area for intake pressure.
It may at best add about 1 hp at top med to high speed, although i have not read of any measurements.
When your dealing with 70-90kg pilots , 60-70kg bikes and engines with only 8+ hp then every little bit helps.
ah yeah i get ya, sorta like ram flow on a road bike, im not having a got at ya but personally i dont see it helping at all on a mini bike especially one of the cheap 110 minis, by the amount of dirt that i get in my face from the front wheel i would say the air cleaner would cop it sweet.
maybe if you did alot of flat track or super motard with high speeds it might be a good idea.
In mud its probably better to have backward. When youve got such under powered bikes everything helps. The bloke wanted free mods so thats one for him that will have some performance beneift. Not a huge amout, but what do you get fo free.
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