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Author Topic: Road legal, air cooled, single cylinder road bike above 350cc?  (Read 773 times)

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Offline Oerange

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I have a Cagiva SST 350, and im obsessed with the simplicity of two stroke singles.

I have been looking at the Suzuki TS 400 and Yamaha DT 400 (:

Any road bikes?

My first impression is that there are very few?

Please tutor me.
« Last Edit: April 21, 2017, 03:51:10 AM by Oerange »

Offline pdxjim

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Re: Road legal, air cooled, single cylinder road bike above 350cc?
« Reply #1 on: April 21, 2017, 08:45:46 AM »
KTM 380 EXC with supermoto wheels?

Offline jengel451

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Offline Oerange

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Re: Road legal, air cooled, single cylinder road bike above 350cc?
« Reply #3 on: April 21, 2017, 10:04:22 AM »
Hmmm both are ridiculously nice bikes, but I'm looking for air cooled engines. 

Im looking for something super super simple, yet more powerful than the cagiva 350 sst.

I probably have ridiculous demands  :rolleyes:, but just to clarify, I have 5 criteria:
1. Road legal
2. Two stroke
3. Single cylinder
4. Air cooled
5. Above 350cc (or more than 30ish hp?)

Legal engine mods are extremely limited in Denmark, but im looking to upgrade dampening and braking, so as long as I have a proper base (frame and engine) Im good.

Offline javelin grl

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Re: Road legal, air cooled, single cylinder road bike above 350cc?
« Reply #4 on: April 21, 2017, 10:18:34 AM »
Apart from the Suzuki & Yamaha dirt bikes I can't think of anything. You could brew your own, we have a member with a 370cc Bultaco moto cross engine (It's morphed into a liquid cooled Rotax top end grafted on now) in  Metrala chassis
15 883 R Sportster
83 DT 125 LC it works again!
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Offline Oerange

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Re: Road legal, air cooled, single cylinder road bike above 350cc?
« Reply #5 on: April 21, 2017, 02:23:00 PM »
Sounds cool :) but I would never get it approved in Denmark.
And the metralla frame would have to be imported  :twocents: :twocents:... Maybe i should just be satisfied with the Power output of the cagiva  :cheers:

Offline m in sc

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Re: Road legal, air cooled, single cylinder road bike above 350cc?
« Reply #6 on: April 21, 2017, 03:37:57 PM »
husqvarna 400.

my friend dave parsons had one, road legal, pretty much identicle to this. i tuned it, regeared it, fit a baja designs liting kit to it, and it ran good but what a miserable bitch on the road. had better tiers and lights but was terrible to ride.


his 125 is MUCH more useable.






get off my lawn.

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Offline oldjohnno

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Re: Road legal, air cooled, single cylinder road bike above 350cc?
« Reply #7 on: April 21, 2017, 03:42:12 PM »
There's something utterly joyful about riding an ultralight, skinny, two stroke single on the road. There's nothing else quite like it.

If it has to be air-cooled then you're limited to older bikes. They won't be as quick as the newer stuff but could still be made fast enough to be fun. I can't think of many 350cc+ production road bikes - the Montesa Crono perhaps - so you'll probably have to adapt a trail or enduro bike with street tires, bars and gearing and possibly better brakes.

The TS400 was super torquey and about as simple as a bike can be, and could be upgraded with TM components but they're quite old and not so common anymore. The Yamaha DT400 would be a more common candidate and would be upgradeable with MX/YZ parts. You could also consider converting one of the more serious early enduro bikes like the PE400, IT465, Husky WR390, 370 Frontera and so on. Any of these would be a hoot with road tires. Just keep in mind that all these big singles vibrate at high rpms, so they can be a little uncomfortable for prolonged high speed work. You also have to be super-particular about jetting; a big single that bucks and pops on the over-run can be obnoxious, one that seizes even more so.

But for point-and-squirt stuff they're a delight - a skinny single that carries the front wheel out of corners is sure to make you smile. At some stage I'd like to build a KX500 powered cafe bike - maybe next year,

« Last Edit: April 21, 2017, 04:45:19 PM by oldjohnno »
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Offline MarkT

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Re: Road legal, air cooled, single cylinder road bike above 350cc?
« Reply #8 on: April 21, 2017, 08:24:29 PM »
The Rotax-powered Can-Am TNT's were powerful...  I think the 250 had around 30HP and more power could easily be had by using MX parts.

Rare model though...  probably not easy to find these days.
1963 Yamaha YG1-T, 1965 Yamaha MG1-T,  1966 Sears Allstate 250, 1970 Yamaha CT1, 1972 Yamaha R5 - 400 project bike, 1981 Yamaha DT175, 1988 Yamaha DT50, 1990 Yamaha Super-DT50

Offline Pgcmoore

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Re: Road legal, air cooled, single cylinder road bike above 350cc?
« Reply #9 on: April 29, 2017, 01:20:23 PM »
an 83 yamaha IT 490 could make a scary super moto if you could get the gearing right, just a thought   :lol:

« Last Edit: April 29, 2017, 01:36:59 PM by Pgcmoore »

Online jrotten99

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Re: Road legal, air cooled, single cylinder road bike above 350cc?
« Reply #10 on: April 29, 2017, 04:47:33 PM »
Sorry but I've owned an IT490 and ran it for a lot of years. It's an off-road bike. Uncivilized is a good description on its best day. Great in big country but much better alternatives.

Offline jimmer

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Re: Road legal, air cooled, single cylinder road bike above 350cc?
« Reply #11 on: April 29, 2017, 06:16:52 PM »
I've had a few 2 stroke,big bore singles.Yamaha DT360,Rokon RT340, Honda CR500, Can Am 370 Qualifier,and spent some time on a Husky 390 (paint shaker from hell).None were stock,some mildly,some wildly tuned. Hands down my favorite was the Can Am. Crazy wide strong power, smooth, bullet proof, suprisingly decent fuel economy.

Offline Seizer

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Re: Road legal, air cooled, single cylinder road bike above 350cc?
« Reply #12 on: April 29, 2017, 06:41:06 PM »
I loved my CR500. Amazing motor. Amazing. I can't imagine that thing on street tires with that chassis though. Or brakes. Or forks haha. That'd be a fun motor to transplant into a modern lightweight (rigid) chassis. Oh the fun.
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Offline jimmer

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Re: Road legal, air cooled, single cylinder road bike above 350cc?
« Reply #13 on: April 29, 2017, 07:22:36 PM »
Probably the best candidate would be the KTM 300 e-start in a modern street chassis- 250/300 Ninja, R3?

Offline peaky

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Re: Road legal, air cooled, single cylinder road bike above 350cc?
« Reply #14 on: April 29, 2017, 08:12:56 PM »
For the kind of HP you'll get from an old Yam or Suz, why not go with an RS125? Are they street legal in your country? I rode a Kawi F5 that had been converted to cafe bike. It was a hoot.