My HF 6.5hp Clone does 21mph with 7.2 : 1 ratio is this too slow?

[johnnynguyen85]

hello there, is this 21mph too slow with a 6.5hp clone engine from Harbor freight. my overall drive ratio is 7:1. i expect it go faster then 21mph.

 

[Stang]

Is the governor still connected? how tall is the back tire? You can probably go lower. maybe 6 or 5.5:1. Is the motor revving up or feel bogged down?

 

[bigevilone2]

hello there, is this 21mph too slow with a 6.5hp clone engine from Harbor freight. my overall drive ratio is 7:1. i expect it go faster then 21mph.

I told you what gears to run in your other post, BUT YOU DIDN'T LISTEN TO ME ! :thefinger:

 

[johnnynguyen85]

Is the governor still connected? how tall is the back tire? You can probably go lower. maybe 6 or 5.5:1. Is the motor revving up or feel bogged down?

yeah the governor still connected. it's an 8" back tire same as front

 

[johnnynguyen85]

I told you what gears to run in your other post, BUT YOU DIDN'T LISTEN TO ME ! :thefinger:

ok, i though that the magic # is 7 to 1. i'm trying to save money here, one of my stock sprocket from the jack shaft is a 15 tooth. i'm going to swap it to make it 5:1 ratio

 

[Stang]

yeah the governor still connected. it's an 8" back tire same as front

I meant the actual diameter of the tire not the wheel.

 

[johnnynguyen85]

I meant the actual diameter of the tire not the wheel.

15" diameter of the tire

 

[Motra]

Wow, that's a Kawasaki Coyote! Could you just remove the jackshaft and run the drive chain from engine to rear wheel? That way you'd get rid of a lot of gear reduction.

 

[minidragbike]

ok, i though that the magic # is 7 to 1. i'm trying to save money here, one of my stock sprocket from the jack shaft is a 15 tooth. i'm going to swap it to make it 5:1 ratio

If someone told you what to run and your not happy. Hey it's your own fault, to get more speed you need something like 6.0 ratio. But it all depends on how fast you want to go. I use to run a 6.0 ratio with only a 5.5hp clone at 30 mph and I'm 250 lbs.

 

[OldMinibiker]

hello there, is this 21mph too slow with a 6.5hp clone engine from Harbor freight. my overall drive ratio is 7:1. i expect it go faster then 21mph.

Just curious,are you happy with the power you have now? How does your mini do up inclines etc.? Thanks....

 

[olajoe808]

ok, i though that the magic # is 7 to 1. i'm trying to save money here, one of my stock sprocket from the jack shaft is a 15 tooth. i'm going to swap it to make it 5:1 ratio

doing the same here except moving down from 6:1 it'll be a few days till then if u get ur's runnin before let us know how it went.

 

[Strigoi]

yeah the governor still connected.

that's a big part of your problem right there. these motors only rev to around 3600rpm with the governor installed.

 

[johnnynguyen85]

Just curious,are you happy with the power you have now? How does your mini do up inclines etc.? Thanks....

i'm pretty happy with the bike, its take off pretty fast but don't have alot of top end. i just ride my bike on flat ground.

 

[johnnynguyen85]

ok, my bike goes up to 30mph now. with 5:1 ratio. i'm pretty happy with it now. i don't want to go any fastest, just to be safe, i have no health insurance. yesterday i got a warning from a police for riding it on a big park. lol

 

[johnnynguyen85]

Wow, that's a Kawasaki Coyote! Could you just remove the jackshaft and run the drive chain from engine to rear wheel? That way you'd get rid of a lot of gear reduction.

i did that, and the chain keep popping off. Yeah this is a Kawasaki Coyote. i bought it for $80 without the engine. is this a good deal?

 

[Strigoi]

it kept popping off because the clutch sprocket and rear sprocket weren't lined up most likely.