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Old 09-23-2007, 11:33 AM   #61
paniro187
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Quote:
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Read my posts in 250 gp racing... then read moody's post with the link on the 450 4-stroke conversion. We were talking about how 250gp 2-stokes are becomming fazed out dude. Thats how this thread came about.

I know your thinking just about dirtbike conversions....... You can build what ever you wish.

These 450 4-stroke conversion looks to be early prototypes of whats to come in the near future for the lightweights. Pretty cool IMO as 4-strokers have more potential towards advantages and benefits over the 125/250gp 2-strokes.
we're not talking baout how this thread came about and to be honest more than anything i was just thinking of how fast a fx500 or cr500 would be because of such a big bore engine in a really light bike. it was nothing you had to say "dude we're talking about 4 strokes" which in it's elf didn't make much sense to say.
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Old 09-23-2007, 11:37 AM   #62
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I used to own a Honda CR500 and its was a wicked bike, and it wasn't really that fun on a motocross track. On the trails it was ok, but I would have taken a four stroke anyday over it. Converting that into a road race bike would not work out because the insane amounts of vibration produced by the motor and the abruptness of the powerband. Open up the throttle in the first three gears and you are looking at the sky. I end up selling it because it wasn't a real usable bike for any purpose other than it being a nice conversation piece.
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Old 09-23-2007, 11:55 AM   #63
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I used to own a Honda CR500 and its was a wicked bike, and it wasn't really that fun on a motocross track. On the trails it was ok, but I would have taken a four stroke anyday over it. Converting that into a road race bike would not work out because the insane amounts of vibration produced by the motor and the abruptness of the powerband. Open up the throttle in the first three gears and you are looking at the sky. I end up selling it because it wasn't a real usable bike for any purpose other than it being a nice conversation piece.
sounds like yoiu're describing one of the old 500 gp bikes. the reasons you gave sound like a great reason for slightly smaller sprockets. abruptness of the power band. Sounds like a reason to getting better in not highsiding yourself to oblivion. sounds a lot more fun than a boring 4 stroke is what i'm saying. kind of like the reason rossi preferes to 2 strokes to the four strokes. just because of the sheer excitement. and to be quite honest it sounds like the the cr or kx500 with a wiseco high compression piston could hang with 1000's easily.
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Old 09-23-2007, 12:11 PM   #64
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Quote:
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sounds like yoiu're describing one of the old 500 gp bikes. the reasons you gave sound like a great reason for slightly smaller sprockets. abruptness of the power band. Sounds like a reason to getting better in not highsiding yourself to oblivion. sounds a lot more fun than a boring 4 stroke is what i'm saying. kind of like the reason rossi preferes to 2 strokes to the four strokes. just because of the sheer excitement. and to be quite honest it sounds like the the cr or kx500 with a wiseco high compression piston could hang with 1000's easily.
I'm of the belief that if its such a great idea, the masses would have jumped on it by now and you would see class of bike like this in club level racing. This isn't the case and most reports I've seen of this type conversion have been putting them in a 250 gp chassis. The most common issue noted were cooling, vibration, and frame cracking. The 500cc motors are not counterbalanced at all, front what I remember. It would be cool to stick these in a light gp chassis, but when it starts breaking motor mounts and welds then the costs outweigh the benefits.
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Old 09-23-2007, 12:22 PM   #65
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I can see what your saying about the 500s but 2stroke in general I like better than 4strokes simply due to the fact that they make more power with less weight. Plus I personally like riding 2 strokes. I am actually considering doing the road race conversion on a cr/kx/rm 250. The 250 is a somewhat smooth engine and can easily make 50hp in a less that 270lbs setup.
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Old 09-23-2007, 01:28 PM   #66
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I got panrio's point. It's just a 3rd or 4th tangent for this thread.
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Old 09-23-2007, 01:30 PM   #67
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i see a lot of 2 stroke motards...like the 250s and 500s...they make for some sick videos...

anyhow, whether or not this is about 450s or 250s or 2 strokes, this would be a fun project to undertake, and one day I will probably do it....
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Old 09-23-2007, 05:59 PM   #68
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Quote:
Originally Posted by paniro187 View Post
we're not talking baout how this thread came about and to be honest more than anything i was just thinking of how fast a fx500 or cr500 would be because of such a big bore engine in a really light bike. it was nothing you had to say "dude we're talking about 4 strokes" which in it's elf didn't make much sense to say.
sigh..............kewl. who is we're? you and me? they sure would be fun bikes. could do alot of sliden around on one of those
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Old 09-23-2007, 08:30 PM   #69
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sigh..............kewl. who is we're? you and me? they sure would be fun bikes. could do alot of sliden around on one of those
now that i'm really thing about it i think they are a highside waiting to happen. can you imagine??? then adding a wiseco high compression piston
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Old 09-23-2007, 10:02 PM   #70
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suzuki already has an awesome 450 fuel injected single... why they continue to make the DRZ400SM w/ carbs instead of with the fi 450 is beyond me.
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Old 10-23-2007, 01:56 PM   #71
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not to dig up a dinosaur but check this out...found this in another forum:

R-YZ-426
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Well, it's done, my Yamahybrid. A late model R6 with YZ426F motor. I thought it might be cool to have a lightweight R6, and started this project a year ago. I put the R1 tail and fairing on it, for looks and the underseat exhaust. It is torquey and fun to ride, it's about a 125 pounds lighter than a R6. With a 16/48 it should just hit 100 mph. I've got a 15/48 on it now, about 95 mph tops. Kickstarts fine, uses a total loss R6 battery for the lights and such. The oil tank holds 3 quarts, the bike uses a YZF426 quad radiator, Pirelli Diablos 120/70, 170/60. It's a gas, but along the way I got a 2006 R6V, so it looks like I will be putting the R4 on the market. Need to mod the 2006, now. Anyway, check it out.
MVC 014F
MVC 013F
MVC 012F
MVC 111F
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Old 10-23-2007, 02:00 PM   #72
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haha.. Weird mod. How much does it weigh?
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Old 10-23-2007, 02:05 PM   #73
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125lb less than an R6...so I'm assuming about 275ish
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Old 10-23-2007, 02:06 PM   #74
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Ohhh.. interesting.
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Old 10-23-2007, 02:08 PM   #75
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Link to where I found it:
http://www.r6messagenet.com/forums/s...ad.php?t=91257
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Old 10-23-2007, 03:44 PM   #76
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that a cool project for a girl street bike i guess. Nice find

but these light weight 250's can pull lap times very close to bigger bikes. I dont think 95 mph going to cut it.
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