Kawi2strokes.com Forum

I've raced my T500 the last couple of years up at the old Loring AFB in Limestone, ME. It's a 1.5 mile standing start track (speeds also measured at the 1 mile mark.) I've stayed in "Production" class which means that the bike has to appear stock from the outside. It's not unknown for guys to cut apart stock pipes to weld a cone inside then weld the pipes back up so they appear stock. Anyway, my best speed was 116.xxx in the mile and 117.xxx in the 1.5 mile. Aerodynamics is pretty important and I can't get as flat on the bike as I'd like and still keep my feet on the pegs (required.)

I'm building an electric bike based on a Hayabusa but am starting to consider trying my H2 as well. It's a '74 frame/engine with '72 tank and swingarm, EX500 caliper, bronze swingarm bushings, tapered roller bearings in the steering head, TC pipes, TM34 carbs, light porting and head work (probably done 10-12 years ago by Ron at Purple Haze), Nev's ignition, 14" shocks, tranny work by R&D. It's extremely unlikely that this bike would ever be returned to stock and I could use a good fairing, rearsets, etc. etc. in a quest for top speed. Other than my T500 and one or two small displacement bikes there's not much 2-stroke presence.

My initial thoughts are more porting and bigger carbs of course but I'd like to hear your guys' opinions. Is there any value to reeds? Would a bit of NO2 hurt or help? It's all about HP versus aerodynamics at the "big end"... what would you do?

thanks!

I'd get in touch with Falconman from the old board as he was heavily involved in LSR triple projects
Also, study the class rules to see what class your platform would be most competitive in

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There are only two types of motor sport racing:
Nitro and everything else
(Sometimes referred to as fast and slow)

Falconman from the old board is Falconman here.

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If it surges, that's normal, upshift.

Thanks guys. There's numerous classes in which I would be competitive and a record holder, as most of the records are "open."

Biggest trick to make a H2 fast is fitting big carbs, as in 40 mm. 34's are just to small.
And reduce CR to make it rev easier.

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Speed is what’s life about.

The main thing that I would go for is aerodynamics. That is what eats up hp. A 50cc Kriedler can do 118 on something like 9 hp. Get small.........

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........

Hi Leo,

I assume CR = compression ratio? Would you recommend round slide, flat slide, Lectron's?

I agree on the aero suggestion: the biggest variable I found with my T500 was how well I could stay in a good "tuck."

It doesn't really matter,as they all flow the same with the throttle WFO. I would stay away from Lectrons personally.

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........

Not exactly. Flat slide TM carbs actually flow slightly better than the same sized round carbs and make more power according to tests done by Olav Aaen. Interesting eh.

The slide on a TM causes less flow disturbance than the big old hole where a VM slide moves up and down. They are also more responsive to throttle according to many.

What I have never read though is a comparison between a Lectron and similar sized Mikuni TM or TMX. That would be interesting.

Carbs are the least of the problems and would assume a swap would be part of resetting your record after you take the open spot.
Assuming the bike can get up to speed in the allotted space, it really does sound like a drag motor (that can stay together) with the best aero profile. I imagine the size, type of wheels and tires would also be very important for best performance.

What it really comes down to is:
* Is the goal to take an open record without trying to make it hard to reset?
* How much money do you want to spend?
* Do you want to invest the time and money to set a record that would be a biatch to crack?
* How much money do you want to spend.?

Good luck; this sounds like a way cool project.
I think that a 2-stroke would inherently have a possible advantage with high peak horsepower with a lower weight than a 4-stroke.
Then again, class rules and weight breaks could level the playing field.

_________________
There are only two types of motor sport racing:
Nitro and everything else
(Sometimes referred to as fast and slow)