Hawk, TBR7 and Magician top speed averages.

[Wild Dog]

Originally Posted by Megadan

Top speed matters a lot more to those of us that live in the U.S. outside of the big cities, which is about 80% or more of the land mass that comprises our country. In the Central U.S. where I live there are large swaths of nothing for hundreds of miles

This ↑↑↑
Same thing happens here, in the south of country hundreds and hundreds of miles without a soul or sometimes phone signal... In those area people just ditch small cc bikes for something more powerful or medium sized engines.

[Hawkrider91]

if i can just get my bike ride comfortably at 60 ill be fine.

[OneLeggedRider]

Originally Posted by Hawkrider91

if i can just get my bike ride comfortably at 60 ill be fine.

Not enough information. Is the bike broke in (about 500 miles on it)? Mine topped out at 56mph when new and at about 180 miles it suddenly (as I was riding home) would do 64mph and I had to turn the idle screw down.

After that I drilled the stock pilot to .45mm, added a 3rd washer to the needle and a 110 main jet (performs flawlessly up to 80° temps) and then it would do 66mph with the 12/33 (16/45 = 2.8) ratio. Now with the 13/33 (2.5) ratio it cruises along happily at 60mph and you can actually wind the first 3 gears some before having to shift up.

Being that Florida is so flat you can probably get best results from 17/43 (2.5 ratio) or even go to 17/40 (2.35 ratio).

[JerryHawk250]

Originally Posted by OneLeggedRider

No, we didn't include any oddballs or fanatics..

Oddballs??? Fanatics??? Wait! I resemble that remark! lol


My Hawk in stock form with tuned stock PZ30 carb (40 pilot/115 main), gutted cat and 17/40 sprockets would top out at 72mph. But only after I had put 500-600 mile on it. before that it struggled to do 60mph.

[OneLeggedRider]

The Hawk class gear ratio average is 2.83

The TBR7/Magician class gear ratio average is 2.68

I think everyone will agree that the 2.5 ratio is the sweet spot for for these bikes as far as comfort and speed. This also tells me that the average Hawk class owner in the group is geared too low, which skews the top speed number a bit.

And being that the TBR7/Magician class owners are closer to the sweet spot could also somewhat account for their higher top speed average. And as MegaDan mentioned the sweet spot for the TBR7/Magician class is probably lower (2.3 - 2.4) because of the smaller tire diameter. So basically the entire group is geared too low for accurate top speed numbers.

Back to the drawing board I guess.

[OneLeggedRider]

Originally Posted by JerryHawk250

Oddballs??? Fanatics??? Wait! I resemble that remark! lol


My Hawk in stock form with tuned stock carb, gutted cat and 17/40 sprockets would top out at 72mph. But only after I had put 500-600 mile on it. before that it struggled to do 60mph.

Wow, that's an impressive number and I'm not sure how much you weigh but from your videos it looks like pretty flat terrain and says alot for the 2.35 ratio.

Oddballs and fanatics.. You and Dan are at the forefront of our sport and always pushing the envelope, which I have to applaud and the rest of us appreciate.

There was one owner in the study that did a mild port and polish without decking the head and his top speed was 71mph, but the average Hawk owner isn't gonna go that far.

[JerryHawk250]

Originally Posted by OneLeggedRider

Wow, that's an impressive number and I'm not sure how much you weigh but from your videos it looks like pretty flat terrain and says alot for the 2.35 ratio.

Oddballs and fanatics.. You and Dan are at the forefront of our sport and always pushing the envelope, which I have to applaud and the rest of us appreciate.

There was one owner in the study that did a mild port and polish without decking the head and his top speed was 71mph, but the average Hawk owner isn't gonna go that far.

I'm on the Jay end of the spectrum at 175 lbs. lol The only hills we have around here levies, bridges and overpasses.

[JerryHawk250]

One thing to understand is that P&P and decking the head doesn't really increase the top speed by a whole lot but it really wake up the mid to upper rpm range to where when running 60-70mph you don't have to twist the throttle wide open to do it. Finally got some nice weather here. I started Friday after work till yesterday riding. I put a few hundred miles over the Labor Day weekend cruising anywhere from 60 -70 mph and never thought twice about doing it. One of the best mods you can do on these bikes.

[OneLeggedRider]

Originally Posted by JerryHawk250

One thing to understand is that P&P and decking the head doesn't really increase the top speed by a whole lot but it really wake up the mid to upper rpm range to where when running 60-70mph you don't have to twist the throttle wide open to do it. Finally got some nice weather here. I started Friday after work till yesterday riding. I put a few hundred miles over the Labor Day weekend cruising anywhere from 60 -70 mph and never thought twice about doing it. One of the best mods you can do on these bikes.

I'm thinking about just doing the port and polish without decking. The reason behind this is we only have 2 local gas stations out here in the boonies and they only sell 87 octane and diesel. I'd have to drive 30 minutes to get higher octane and that would be a pain, having to remember to fuel up before coming home or keeping a couple jugs full at the house.

It's already a pain keeping a jug of 2-stroke mix around for the very thirsty Scrambler.

[JerryHawk250]

Originally Posted by OneLeggedRider

I'm thinking about just doing the port and polish without decking. The reason behind this is we only have 2 local gas stations out here in the boonies and they only sell 87 octane and diesel. I'd have to drive 30 minutes to get higher octane and that would be a pain, having to remember to fuel up before coming home or keeping a couple jugs full at the house.

Understand. I think the P&P alone will make a big difference IMO. But you know me, I had the head off and it was like "Might as well do it" at the time. lol I'd like to see what results you have once done.

[Hawkrider91]

Originally Posted by OneLeggedRider

Not enough information. Is the bike broke in (about 500 miles on it)? Mine topped out at 56mph when new and at about 180 miles it suddenly (as I was riding home) would do 64mph and I had to turn the idle screw down.

After that I drilled the stock pilot to .45mm, added a 3rd washer to the needle and a 110 main jet (performs flawlessly up to 80° temps) and then it would do 66mph with the 12/33 (16/45 = 2.8) ratio. Now with the 13/33 (2.5) ratio it cruises along happily at 60mph and you can actually wind the first 3 gears some before having to shift up.

Being that Florida is so flat you can probably get best results from 17/43 (2.5 ratio) or even go to 17/40 (2.35 ratio).

i have 180 miles on it. so once i hit 500 it should perform better? i have done jets except the pilot jet. i dont where to get it.

[OneLeggedRider]

Originally Posted by Hawkrider91

i have 180 miles on it. so once i hit 500 it should perform better? i have done jets except the pilot jet. i dont where to get it.

Yes it will definitely perform better at 500 miles and will keep improving all the way up to 1000. Drill the pilot to.45mm or order Tako's sprocket and jet kit.

[Azhule]

Originally Posted by Hawkrider91

i have done jets except the pilot jet. i dont where to get it.

I sense a can of Spam with a ebay link coming in shortly

[NzBrakelathes]

Originally Posted by Hawkrider91

i have 180 miles on it. so once i hit 500 it should perform better? i have done jets except the pilot jet. i dont where to get it.

https://clevelandspeedshop.com/colle...t-heist-misfit

[OneLeggedRider]

Well after much debate, a few fistfights, and some heartfelt apologies at the last Bored Member meeting it has been decided that a 2.5 gear ratio is NOT infact the "sweet spot" for these little China bikes.

A broad consensus of our riders who weigh 175+lbs and don't live in the flatlands feel that a 2.6 ratio is more to our liking and J. Money concurs (not sure why but Jay's hoping that moniker will stick). Even at his meager 140lbs he says the 2.3 ratio felt like power assisted coasting and is really pleased with his current 2.6 ratio.

Justin, another member of the study has been playing with different ratios before upgrading to the 520 setup. He tried the 2.5 per my recommendation (he's currently 2.86) and there was no speed increase and a significant power loss in 4th and 5th, so he wants to go to a 2.75 which I strongly disagree with because that was my last ratio and it was a pinch too low.

I currently am at 2.53 with 13/33 sprockets (which J. Money loves), but if I'm not happy with it I'm gonna go to 13/34 which is a 2.61 ratio.

**Also if you go to the 520 do not go bigger than a 12 tooth front sprocket. I had to cut out a significant portion of the sprocket cover to make clearance for the beefier chain.