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Old 07-20-2013, 08:40 PM   #1
Johnny77095
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Need 2 stroke advice (parts sourcing)

I'm toying with the idea of building a 2 stroke bike (ground up, custom frame and body paneling) ... but I didn't really follow motoGP back in the days of 500cc 2-strokes.

Any suggestions on where to start looking for engines/trannies? If I can, I'd like 2+ cylinders, and liquid cooling. I'd prefer it be over 300cc, and preferably closer to 500. I have a line on several "old" dirt bike engines, but they're all singles.

Any help would be appreciated,
Johnny
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Old 07-21-2013, 09:46 PM   #2
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I think eBay would be your best bet. Rd 350? I'm a Yamaha person
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Old 07-22-2013, 05:25 AM   #3
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You're not going to find a lot of 500cc two strokes with liquid cooling, not at least for less than a lot of money. I am thinking about RS500, RG500, and there was a Honda but the name escapes me right now. Each of those bikes were purpose built racers like a modern 600cc super sport bike, so building a custom frame around them, unless your last name is Harris, would be reinventing the wheel.
Ah, the Honda NSR400, I don't think they had a 500, and each of these bikes had smaller variants.
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Old 07-22-2013, 09:00 AM   #4
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Thanks for the input... I've been doing a lot of research into this... I found an old 70's era 550cc air-cooled triple on ebay with the tranny for $550.

Another option is the Yamaha Banshee twin (liquid or air cooled versions available) which uses the same engine base as the old RD350... there are a ton of up-size kits for them that would take it from 350cc up to as much as 650cc just by changing the jugs and slugs.

Another option is a specialized V-4 I found, but they're kinda spendy (like$15k).

I've also found numerous sled motors but they're equipped with CVT, so I'll have to figure out a dry clutch set-up and rig it up to a close ratio 6-spd from another bike (kinda like a Harley that would have a primary/secondary set up rather than a direct shaft input).

The option I'm leaning towards on my first go'round is the banshee set-up. Start with a basic big-bore and maybe a stroker kit (they're not too expensive for these bikes) and start tweaking the frame design around that.

2nd option is to go the route of the Tul-Aris style bike with a large displacement, low RPM Twin or Triple cylinder sled engine and modify a 5 or 6 spd tranny to fit with a dry clutch and right-hand chain primary-drive... but this is A LOT more work than the first bike.

If anyone is interested in getting involved in this project(s), just shoot me a cell number and I'll get in touch with you sometime this week. Otherwise, wish me luck and we'll see how far I get...

Johnny
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Old 07-23-2013, 01:04 PM   #5
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Do you have more money than you know what to do with? If so I can help.
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Old 07-23-2013, 02:55 PM   #6
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http://r125forum.com/threads/my-dads...2012-mod.1167/

Found this and felt it was relative
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Old 07-24-2013, 11:41 AM   #7
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Quote:
Originally Posted by sixerSLYGUY View Post
http://r125forum.com/threads/my-dads...2012-mod.1167/

Found this and felt it was relative
Such a sick bike.
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Old 07-31-2013, 03:45 PM   #8
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Yep... that was definitely relative... Nicely done sir!!!

I don't think I'll be investing that kind of money, but I'm thinking similar ideas... So far I have a Yamaha banshee engine/tranny (same as the RD350 without the "power valve" on the exhaust side), and a custom frame I'm working on... it's still just a model in my laptop, but it's coming along. Finding the power-plant was the hardest part... the rest is just a little cutting, welding, heat treating, cussing, bleeding, cussing some more... and VOILA!!! Motorcycle...

What I need now is someone who knows about tuning these things for the kind of power-band I'm looking for (usable power from 5k-9k rpms) ... I don't know much about 2-strokes, but I'm learning as I go...

OH.. and Gabe... thanks for the offer, but my "limitless funds" are spoken for by my significant other... if you know a good 2-stroke tuner (like a dirt-bike engine guy) shoot me a PM...

I'll probably focus on fitting up the frame for now and get back to power problems around the end of the year...

Last edited by Johnny77095; 07-31-2013 at 03:49 PM.
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Old 08-17-2013, 03:05 PM   #9
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Quote:
Originally Posted by Bigshankhank View Post
You're not going to find a lot of 500cc two strokes with liquid cooling, not at least for less than a lot of money. I am thinking about RS500, RG500, and there was a Honda but the name escapes me right now. Each of those bikes were purpose built racers like a modern 600cc super sport bike, so building a custom frame around them, unless your last name is Harris, would be reinventing the wheel.
Ah, the Honda NSR400, I don't think they had a 500, and each of these bikes had smaller variants.
this is very true!!! also, be ready to RESEARCH!! a lot of crappy after market parts, but you will learn by reading that you can use a lot of different stuff from all kinds of bikes! you can find several different models from the 80s and back but it's not easy. another way to go would be fabing an enduro from the 80s and back instead of looking for a motorcycle.
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Old 08-17-2013, 03:08 PM   #10
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Quote:
Originally Posted by Johnny77095 View Post
Yep... that was definitely relative... Nicely done sir!!!

I don't think I'll be investing that kind of money, but I'm thinking similar ideas... So far I have a Yamaha banshee engine/tranny (same as the RD350 without the "power valve" on the exhaust side), and a custom frame I'm working on... it's still just a model in my laptop, but it's coming along. Finding the power-plant was the hardest part... the rest is just a little cutting, welding, heat treating, cussing, bleeding, cussing some more... and VOILA!!! Motorcycle...

What I need now is someone who knows about tuning these things for the kind of power-band I'm looking for (usable power from 5k-9k rpms) ... I don't know much about 2-strokes, but I'm learning as I go...

OH.. and Gabe... thanks for the offer, but my "limitless funds" are spoken for by my significant other... if you know a good 2-stroke tuner (like a dirt-bike engine guy) shoot me a PM...

I'll probably focus on fitting up the frame for now and get back to power problems around the end of the year...
i haven't missed with too many bigger cc bikes, but since you're talking about power bands, you need to find good custom pipes with an expansion chamber...a trick (at least with the smaller cc bikes) is to place a coat hanger inside the hanger as well, helps that expansion hit the pb harder!
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Old 08-23-2013, 10:35 AM   #11
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Old 08-25-2013, 08:01 PM   #12
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Suzuki GT 750 Water Buffalo water cooled triple
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Yamaha RD 350 / 400 air cooled twin
Yamaha RZ 350 water cooled twin

Water buffalos make a nice cafe racer - Kawasaki triples were fast but handling wasn't their strong suit. RD/RZ are potent small streetbikes that handle well and are fun (wheelies)
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