2 stroke adv bikes ?

[wiggywildwildwest]

g'day guys. i've been thinking lately about the simple wonder of 2 stroke engines. light, powerful, compact and unfortunately relatively thirsty.

i reckon if the thirst bit could be fixed, a 2 stroke adv bike would be the duck's nuts. i've been looking on epay and the interboobs in general. the bits to fuel inject a single cyl. 2 smoker wouldn't be over hard or dear to come by.

also, the direct injection stuff looks like the go, but seems too complex and a bit too hard atm. maybe when there's a bit more info about.

has anyone here had experience with efi 2 strokes ? outboards most likely ? are they significantly cleaner running and more economical ?

[troy safari carpente]

Wiggy... keep your eyes peeled in the next twelve to eighteen months towards the european end of the marketplace... There's some interesting stuff happening with direct injection/Fuel injection/2 stroke engines going on behind the scenes in some back sheds about the place...

As you say; the technology has existed in outboard motors and snowmobile engines for a while now... light, economical (edit: maybe "efficient" is a better word), ie: good performance to weight ratio...

A light 250 - 300 cc Fi enduro 2 stroke... or how about something like a 450 - 600cc 2 cylinder direct injected 2 stroke to power that "Adventure bike" format you're pondering...?

[wiggywildwildwest]

one of those 600 arctic cat donks looks like the go. what sort of trans does a snowmobile have ? i was looking at 360-380 ish euro 2 smokers. it's interesting to look at the success with the aprillia scooters. maybe they are using them as a test bed ?

[Hunsta]

DRJoe to the white coutesy phone. This guy could tell you what could be hooked up. Surprised if he hasnt tried it already.
Been thinking 2 stroke myself lately. However thinking DT175. Im a sadist. I know.

[troy safari carpente]

Most modern snowmobiles/ATV's use various forms of CVT transmissions... well suited to the snowmobile application... but the wieght of these auto transmissions are a bit hefty for a motorcycle application... and while they work well in the cooler conditions... don't tend to like the heat (ie: desert apploications). So for an adventure bike, coupling one of these type powerplants to a conventional cassette style 6 speed gearbox would be pretty good I reckon.

Artic Cat (as you mentioned them) currently have a 800cc FI 2 stroke (paralell twin) that reputedly puts out 160 hp! (I'm guessing thats at the output shaft... ie; BEFORE the transmission?). But given those figures, imagine scaling the the thing back down to a 600cc twin and you could (conservatively) have 80 - 90 hp in a lightweight/performance two stroke package... slip that into something like a 690 R chassis for me please!

Way back in the 90's, I often wondered about the potential of Yamaha's 350cc (parallel twin 2 stroke) Banshee (Quad) motor... those things were light, responsive and heaps of sting. Look at the performance of the various Kawasaki parallel twin 2 stroke Jetski donks also (550cc and 650cc). The horses they get out of those things really rip.

As far as 300cc 2 strokes go... I wouldn't be surprised to see any of the current 2 stroke enduro manufacturers (like Husqvarna, Husaberg or GasGas) come out with a FI 300 cc 2 stroke for 2012...

[KASUYAHO]

With the 2 stroke outboards they have direct injection etc.
Economical but the problem is the exhaust exits the burnt 2 stroke oil.
Oil does not burn that well so oil goes into the water.
Put your hand behind a 2 stroke engine exhaust while it is running and you will get a film of oil on your hand.
So there going 4 stroke out boards.

I know the latest 2 stroke direct injected outboards were more economical than the old non direct injected by a long way.
If the were more economical than the latest 4 stroke outboards.
I could not tell the answer to that.
My guess would be yes.

I am not sure if this is right but i heard that lawn mowers in the USA have to be 4 stroke because of EPA.
Correct me if i am wrong.

Apparently companies like Honda who sell more bikes and the like of KTM,
tougher enviromental restrictions are on them.

Honda did try a 500cc 2 stroke as a test bed to see how it would go in Dakar.
But 4 stroke became the choice again.

I think the 2 stroke would be cool as a ADV bike,
light and go like stink,
would it ever become into production i very much doubt it.

[exoff-roadgoat]

I think with the exception of Califorina two stroke engines are still legal. I think a old air cooled Yamaha single in a newer frame/suspension would rock. I love the sounds and smell of two strokes, I'll have to fire up my smoker Toro snow blower today if the weather lady has her prediction right.

[A_Vasiliev]

Hmmm, I wonder if they make WR transmissions for the CR500...

[DrunkWombat]

Snow mobiles have a belt drive primary (from clutch) to final drive, actuated centrifugally by springs. Think Vespa scooter rideability. But 800cc...

Fuel consumption is still high, but they are still very light. I did a bit of reading on using one of these motors.

http://thekneeslider.com/archives/20...-stroke-racer/

http://www.motorbyte.com/norton/Tularis.htm





http://thekneeslider.com/archives/20...e-twin-update/


Anyways, why not try these mad fuckers in Cairns?

http://www.twostrokeshop.com/index.htm

[slowbike smallpenis]

Interesting how technology can advance - The much prematurely lauded Vdue from Bimota kinda had a fair hand in sending them broke.

[troy safari carpente]

Cagiva offered this 125 two stroke version of their "Lucky explorer" Elefant back in the early 90's...

[peter650]

I am building a ADV bike out off a DT400.14 years ago {before kids}i had a 76 rd400 as my only transport.It was heaps of fun on dirt roads.I have a Varadero and a KLR650 now but i cant wait to get back on a 2 stroke.

[A_Vasiliev]

Originally Posted by peter650

I am building a ADV bike out off a DT400

That actually sounds pretty cool. Fresh engine rebuild, forged piston so you get better reliability, port and polish for a little more power, beefed up frame, front suspension swap along with a modern disc brake (off a YZ250?), maybe slightly redone rear suspension...

[wiggywildwildwest]

i reckon a DT400 motor in a newer frame might be the go. i don't know how you'd register it though. the bit of reading i did suggests the 4 stroke outboards were not overly well received due to weight, complexity and cost.

i was also led to believe the di stuff uses an oil pump to pump minute amounts of oil under the piston to keep things alive.

[-KATO-]

[QUOTE=troy safari carpente;14682909]

Artic Cat (as you mentioned them) currently have a 800cc FI 2 stroke (paralell twin) that reputedly puts out 160 hp! (I'm guessing thats at the output shaft... ie; BEFORE the transmission?). But given those figures, imagine scaling the the thing back down to a 600cc twin and you could (conservatively) have 80 - 90 hp in a lightweight/performance two stroke package... slip that into something like a 690 R chassis for me please! [ /QUOTE]
I'll put my order in now for one of these thanx troy..