sounds about right.
Actual top speed achieved
What top speed are you getting with your current engine / gearing configuration? (Using an accurate form of measurement, i.e. GPS, speedometer, etc).
I'm only getting about 42MPH from mine, timed using a GPS... (should it be faster? are the knobbies slowing me down?)
-TB 88cc w/ ported race head
-20mm carb
-Big Gun race pipe
-15t front / stock 37t rear
-Shinko knobby tires
I'm only getting about 42MPH from mine, timed using a GPS... (should it be faster? are the knobbies slowing me down?)
-TB 88cc w/ ported race head
-20mm carb
-Big Gun race pipe
-15t front / stock 37t rear
-Shinko knobby tires
1 - 20 of 35 Posts
Top Speed on my ride
My engine is a Chinese 86cc in stock form with the following mods:
16t front sprocket
31 rear sprocket
rear tire is 21.5" outside diameter
Kitaco super coil
Advancing CDI
Ported and polished big head
custom cam
106cc
Mikuni 24mm flatside carb, 27mm intake
classic honda ultrapipe
Bike is setup for street.
My GPS said I was doing 72, my speedo was pegged on a slight downgrade. The RPMs were not racing, but didn't have anymore to give and the clutch was slipping bad.
I will soon have 138ccs, shaved flywheel, 28mm flatside carb, and a race head and we'll see what happens.
My engine is a Chinese 86cc in stock form with the following mods:
16t front sprocket
31 rear sprocket
rear tire is 21.5" outside diameter
Kitaco super coil
Advancing CDI
Ported and polished big head
custom cam
106cc
Mikuni 24mm flatside carb, 27mm intake
classic honda ultrapipe
Bike is setup for street.
My GPS said I was doing 72, my speedo was pegged on a slight downgrade. The RPMs were not racing, but didn't have anymore to give and the clutch was slipping bad.
I will soon have 138ccs, shaved flywheel, 28mm flatside carb, and a race head and we'll see what happens.
TB 88cc with ported race head
20mm Keihin PC20 Carb
3 speed tranny with TB Manual clutch
lightened flywheel
lightened primary gears
3.5X10 street tires
16/35 gearing and it needs more
60mph on the Honda Speedo on a 1993 CT70
If you are only getting 42mph, jump up to a 16T front cog for street riding, and a 35T rear. You'll get an easy 10mph more, add street tires, and you'll get a couple of more mph.
20mm Keihin PC20 Carb
3 speed tranny with TB Manual clutch
lightened flywheel
lightened primary gears
3.5X10 street tires
16/35 gearing and it needs more
60mph on the Honda Speedo on a 1993 CT70
If you are only getting 42mph, jump up to a 16T front cog for street riding, and a 35T rear. You'll get an easy 10mph more, add street tires, and you'll get a couple of more mph.
Well ya, the big bores aren't really made to get top speed. Most 50 tracks are pretty tight and flowing. Actually a couple of 88 kits i've ridden have less top end than my 50, and mine only has a Fast 50s pipe.
Bent714 said:Well ya, the big bores aren't really made to get top speed. Most 50 tracks are pretty tight and flowing. Actually a couple of 88 kits i've ridden have less top end than my 50, and mine only has a Fast 50s pipe.
Not a true statement. It all depends on how the bike is set up. If the bike is set up for dirt, it won't be optimal on the street for high-end speed runs. If it's set up for the street, it won't be optimal in dirt.
Mine happens to be a dedicated street cruiser, and is set up for high rpm street use where speed is a determining factor. All that's needed to run my bike in the dirt is to change the front and rear sprockets, and tires and I'm good to go.
ok, sorry, i should have said, "the 88 kits that i have ridden do not have much for top speed" But z88, ur right, they were for dirt.
Very cool. Yeah, I just wanted to confirm whether mine was performing subpar with that gearing combo or not. Good to know it's not...
by the way, "72mph"? that's just scary! 8O
by the way, "72mph"? that's just scary! 8O
partially true, most bore kits will rev slower than the stock 50cc bore/piston, but the lowend power is waaaY better. thats when you regear the bike and use the lowend for higher speeds. once you do that the bored motor will be much faster, all around.Bent714 said:Well ya, the big bores aren't really made to get top speed. Most 50 tracks are pretty tight and flowing. Actually a couple of 88 kits i've ridden have less top end than my 50, and mine only has a Fast 50s pipe.
Ya, what he said...no really tho, i wasn't trying to sound stupid. Sorry if my post was inaccurate, i dont want 2 be a tardo.
Uhhh no, practically all bore kits will rev faster than the stock 50cc bore/stroke, and just have more power every where, so you can regear the bike with taller gearing to take advantage of that newfound power.
when i first put my 88 on it definitly reved faster simply because it could pull me around better. but it did not rev as freely (high) as the stock bike did, so it actually went a little slower top speed wise.
I got 45mph out of my bike with:
Crower cam, piston, and cylinder
20mm carb
15/35 gearing
home-ported head
and that's with a fatass riding it :lol:
I want to upgrade to a .260 cam soon because it feels like the top end is kinda flat, it has great punch down low though.
I feel like it could easily pull a 16 tooth front sprocket too
I'm contemplating on building up a xtreme that I have laying around into a supermoto bike, it did about 60mph(16/37) with a 150lb rider on it, but the speed probably wasn't very accurate, he was riding next to a honda civic. So I wonder how fast it would go if I did some motor work?
Crower cam, piston, and cylinder
20mm carb
15/35 gearing
home-ported head
and that's with a fatass riding it :lol:
I want to upgrade to a .260 cam soon because it feels like the top end is kinda flat, it has great punch down low though.
I feel like it could easily pull a 16 tooth front sprocket too
I'm contemplating on building up a xtreme that I have laying around into a supermoto bike, it did about 60mph(16/37) with a 150lb rider on it, but the speed probably wasn't very accurate, he was riding next to a honda civic. So I wonder how fast it would go if I did some motor work?
My stock geared Xtreme did 50mph on the rev limiter measured on GPS, so I doubt the 16/37(stock) combo did a true 60mph unless you modified your CDI. 16/36 will give you about 53-54mph.
ruf said:My stock geared Xtreme did 50mph on the rev limiter measured on GPS, so I doubt the 16/37(stock) combo did a true 60mph unless you modified your CDI. 16/36 will give you about 53-54mph.
isn't the stock xtreme gearing 14/37?
You guys made me think I was going crazy for a sec. My Xtreme came with a 16T front sprocket. Just counted it AGAIN...
bike #1.)
14/37 sprockets
82cc bbr bbk w/ cam and stock carb
Bike #2.)
16/39 sprockets
88cc super head kit
20mm carb
Bike #3.)
14/40 sprockets
88cc tb kit no head
20mm carb
Bike #4.) stock crf50
Bike #5.) stock xr70
I have had all of these bikes bikes exceeding 90mph. They were on a trailer though.
14/37 sprockets
82cc bbr bbk w/ cam and stock carb
Bike #2.)
16/39 sprockets
88cc super head kit
20mm carb
Bike #3.)
14/40 sprockets
88cc tb kit no head
20mm carb
Bike #4.) stock crf50
Bike #5.) stock xr70
I have had all of these bikes bikes exceeding 90mph. They were on a trailer though.
1 - 20 of 35 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
PlanetMinis Forums
PlanetMinis forum is the internet's largest mini bike community. View thousands of photos, event coverage, tips, tricks and performance mods.
Full Forum Listing
