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Post by nelly on Jun 26, 2020 13:12:30 GMT 1
Ok I know it would be hard work but.....how about using a 4 stroke bottom end, crankcases,crank.Youd have to change bearings and make each cylinder separate.Have a plate to seal off the crankcase to bolt barrels onto.But you'd have strong crankcases,strong clutch, strong gearbox, electric start and a modern chassis brakes and suspension.You can pick up a 4stroke cheap,anything 2 stroke is getting so expensive.By the time you get a big bore kit you've spent thousands.The only thing is can't imagine is the crank/con rod and piston combination.A 750cc would be fantastic ...... anyway feel free to comment chaps!
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Post by chrisg on Jun 26, 2020 15:01:12 GMT 1
Sound like a job for superman or Alan Millyard as we know him  |
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Post by nelly on Jun 26, 2020 17:22:58 GMT 1
Or as Clarkson says 'how hard can it be?'👍🏻👍🏻👍🏻😎
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Post by bare on Jun 26, 2020 17:32:59 GMT 1
Just run Premix and pretend it Is a 2 stroke.
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Post by JonW on Jun 27, 2020 8:26:36 GMT 1
I saw a video a few months back where a guy did this on a single cylinder, I think in Thailand/Malaysaia etc?
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Dave B
Drag-strip hero
Posts: 240 
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Post by Dave B on Jun 27, 2020 10:46:35 GMT 1
I don't think that even Alan Millyard would take that on. It would be easier to make a completely new crankcase, machined to fit an existing transmission from a four stroke than to make the changes you'd need to make to the crank, the seals, the bearings, the cylinder spacing, the induction passages.
I have considered playing around with the idea of a big V6 outboard two stroke design, to produce a high torque, relatively slow revving bike engine, but I don't have access to that sort of facility any more. It's just that I happen to know that you can get a 250hp V6 outboard motor to fit in a GSXR 750 frame....... (it's best not the think about fuel consumption!)
I've seen one of those in a jet ski too, and even spoken to the man who rode it. and seen the terror in his eyes as he remembered how small a mile long lake was at that sort of speed- note that a jet ski will not steer when the throttle is closed, and does not have brakes!
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Post by reedpete on Jun 27, 2020 13:06:21 GMT 1
All things are possible but anything With significant custom Engineering will make OE prices look cheap.
Bikes might be continuing to rise in price but still plenty of engines around. .
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Post by JonW on Jun 27, 2020 14:01:30 GMT 1
I saw a video a few months back where a guy did this on a single cylinder, I think in Thailand/Malaysaia etc? First hit in google when asking '4 stroke into 2 stroke', go figure lol |
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Post by flames on Jun 27, 2020 14:44:31 GMT 1
Brilliant.....although going to all that trouble to convert to a 2 stroke, i think i would of fitted some kind of filter to the carb. Forward facing open carb on a dirt track .......? Not going to end too well.
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kri101
L plate rider.
Posts: 39
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Post by kri101 on Jul 18, 2020 12:28:57 GMT 1
Hi I've always thought a v4 using existing lc 250 cylinders is the way to go plus clutch gear box off an existing and plentiful plus cheap 4 stroke. You then need someone experienced in cad to design the crankcase. Then cast and machined. Crowd funded and then cases could be sold only with small discount for those who helped fund it. I've always thought there would be a market for a multicylinder 2 stroke engine but obviously track use only 😁
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Jul 18, 2020 13:14:50 GMT 1
Pretty sure Stihl chain saws and whipper strippers are a 2 stroke 4 stroke engine
They have ports and not valves and run on unoiled fuel
Small capacity at 32cc, however I suppose anything is possible
Go back to the 60’s o and 70’s and you have 6 cylinder 250’s 2 strokes racing around therefore approx 42cc, not much of a difference
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