drag banshee and a little recreational trail use engine questions?

[AmishElectrician]

Stock engine-less quad

I need some help I`m looking to build a 421 ,but I`m not sure what will be best for me to buy. I mean what kit has the best quality? What do you think will help me have a nice power band from top to bottom and making about 80 horse or more?

 

[sheerider1026]

421 serval

[AmishElectrician]

OK what kind of carbs and transmission i don't want an override i want to be able to gear down on trails 

[Burke]

stock

[AmishElectrician]

ok thanks what will 110 racing fuel do for me? better than premium 

[AmishElectrician]

ok but what r the benefits of alcohol and 110 race gas 

[trickedcarbine]

A ported stock cylinder with 4mm stroker on race fuel will definitely be capable of making your 80 HP goal. You could go with a serval and get it ported and make the same on pump fuel, but it's more dollars.

 

As far as alky vs. race fuel..... It's kind of an opinion, but alky is not for the lazy. It is a cheaper fuel, but requires a little bit pricier carbs and it will need to be purged in between rides. Race fuel is fun, but you have a totally different looking plug then what you are used to hearing about.

[Oregon dunner]

I use my 421 cub for drag, trails and mostly hill climbs, I have 19cc domes, 35pwk, 152 main, 48 pilot and needle on the 4th clip. It's has the aggressive port job from HJR and a lock out clutch on a modified stock tranny. +7 on timming and burning 110 octane. I made 96 hp on redlines dyno. I have had zero problems running on the trails. I run a 12 front sprocket and a 43 rear and 22.11.8 10 paddles. It had good wheel spin when I need it in the soft and steep hill climbs and enough gear without winding out in the drags.

[rjdgriff]

I use my 421 cub for drag, trails and mostly hill climbs, I have 19cc domes, 35pwk, 152 main, 48 pilot and needle on the 4th clip. It's has the aggressive port job from HJR and a lock out clutch on a modified stock tranny. +7 on timming and burning 110 octane. I made 96 hp on redlines dyno. I have had zero problems running on the trails. I run a 12 front sprocket and a 43 rear and 22.11.8 10 paddles. It had good wheel spin when I need it in the soft and steep hill climbs and enough gear without winding out in the drags.

wow that is geared low

[Oregon dunner]

It is. I forget the actual ratio but its in the 3's it works best for my type of riding. I mostly play in the steep hill climbs. I might change the front tooth up one.

[rjdgriff]

My 421 serval is 15/41 and even then when I drag, I am launching in 3rd... I think I'm going to slap a 16 on front and see how I like it and if its to much I have a 39 rear I'll try out