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Old 02-13-2018, 01:25 PM   #1
sida
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Lightbulb Cripple Triple- carbureted bike

Hi,

Anyone cripple a carb'd bike? I am considering doing so to a GSXR SRAD 600, and wanted to know if any of you guys have done it before and if you encountered any complications. Since there's no computer, I was considering just putting in a dead plug in cylinder 2 and keep everything else the same. I know I would probably have to tune the carbs to get maximal power, and a dead plug might not be race legal, but I'm mostly doing it to work on corner speed and saving tires.

Appreciate any advice/insight!
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Old 02-13-2018, 01:46 PM   #2
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These guys might be able to point you in the right direction:

https://www.450triple.com/
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Old 02-13-2018, 01:56 PM   #3
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Originally Posted by Hooli View Post
These guys might be able to point you in the right direction:

https://www.450triple.com/
Thanks for the link/reference. I saw that page, but it seemed geared towards EFI bikes and getting max performance out of the 450; I'm lookin for quick n' dirty on a carby.

Appreciate it all the same!

edit: I sent them a pm all the same though just incase

Last edited by sida; 02-13-2018 at 02:05 PM..
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Old 02-13-2018, 02:04 PM   #4
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u aren't going to race? how about a throttle stop? performance-robbing without any complexity

there are more efficient ways to learn better corner speed, like coaching. HP isn't hurting your corner speed, its your braking skills that are the issue. u don't need less HP to work on those. going slower at the end of each straight might help u to learn by yourself, but it still won't be quick learning.
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Old 02-13-2018, 02:22 PM   #5
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You'll end up with a TON of fuel in your oil if you do that.
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Old 02-13-2018, 04:28 PM   #6
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I think the dead plug would work and then you just find a way to disconnect the "crippled" cylinder carburetor from the fuel line. I think a vaccum cap on fuel intake and then a plug on the fuel line.
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Old 02-13-2018, 04:47 PM   #7
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You'll end up with a TON of fuel in your oil if you do that.
Good point- didn't think about that. Thanks for the input!
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Old 02-13-2018, 04:48 PM   #8
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Originally Posted by KrustyKruser View Post
I think the dead plug would work and then you just find a way to disconnect the "crippled" cylinder carburetor from the fuel line. I think a vaccum cap on fuel intake and then a plug on the fuel line.
That sounds like a much better idea! I'll try it this weekend. Appreciate the input, as well as your distinction between engines and motors.

Last edited by sida; 02-13-2018 at 04:52 PM..
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Old 02-13-2018, 04:51 PM   #9
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Originally Posted by stangmx13 View Post
u aren't going to race? how about a throttle stop? performance-robbing without any complexity

there are more efficient ways to learn better corner speed, like coaching. HP isn't hurting your corner speed, its your braking skills that are the issue. u don't need less HP to work on those. going slower at the end of each straight might help u to learn by yourself, but it still won't be quick learning.
Eh, might race eventually; just not soon. Throttle stop sounds like a good idea, but I think triple cripple is a cool idea Also, I ride a 250 on the track now, so, no, I don't have good braking skills because I don't usually need them. Lol. I just want a step between my 250 and 650/600 big bikes, and the triple 450 sounds like it fits. Besides, I already have this fully race-farkled SRAD

Regardless, thanks for the input!

Last edited by sida; 02-13-2018 at 04:53 PM..
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Old 02-13-2018, 09:48 PM   #10
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Originally Posted by KrustyKruser View Post
I think the dead plug would work and then you just find a way to disconnect the "crippled" cylinder carburetor from the fuel line. I think a vaccum cap on fuel intake and then a plug on the fuel line.
Srad gsxr uses a single fuel line to feed all 4 carbs on the rack, fed from the center IIRC. It'll involve some disassembly of the carbs to disable just one of them. I don't know much about the 450 cripple but I seem to recall it,s usually one of the center 2 cylinders that is crippled? If so, it's not as simple as blocking the fuel rail because the outboard carb would still need gas.

One could get some spare jets and solder them closed to starve an outboard cylinder, and that is likely less work to reverse regardless on any case.

Probably even easier is to find a plug that has the same threads as the float valve seat and seal off then while carb. NO point to letting gas into that float bowl at all, as it'll sit there and turn into varnish eventually.

Also the if option system is "wasted spark" meaning 2 cylinders are fired off of 1 coil. One on the exhaust stroke, the other on compression which makes the BANG. If you disable the spark on one cylinder I'd expect problems with the other it is paired with on the Wasted Spark system. Closing the gap all the way might be OK though. Someone smarter should chime in soon
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Last edited by auntiebling; 02-13-2018 at 10:00 PM..
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Old 02-14-2018, 07:33 AM   #11
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I'm not sure why you think a 450 triple will be any slower than a 650 twin, my understanding is that they're pretty similar.

I'd consider finding a rubber plug the right size and inserting it in the intake port. If that bike uses rockers for the valves, you could remove those instead.
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Old 02-14-2018, 07:46 AM   #12
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Old 02-14-2018, 11:48 AM   #13
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Quote:
Originally Posted by stangmx13 View Post
u aren't going to race? how about a throttle stop? performance-robbing without any complexity

there are more efficient ways to learn better corner speed, like coaching. HP isn't hurting your corner speed, its your braking skills that are the issue. u don't need less HP to work on those. going slower at the end of each straight might help u to learn by yourself, but it still won't be quick learning.
100% agree.
disabling a cylinder is a very bad move on a number of front. If you work on your BASICS ... the power will NOT be an issue.

It's all about the "loose nut behind the wheel".

You can develop your riding technique and will never scare yourself or get in over your head. LEAVE your bike ALONE. Learn to RIDE!
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Old 02-15-2018, 09:41 AM   #14
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Originally Posted by Rumbo Sur View Post
100% agree.
disabling a cylinder is a very bad move on a number of front. If you work on your BASICS ... the power will NOT be an issue.

It's all about the "loose nut behind the wheel".

You can develop your riding technique and will never scare yourself or get in over your head. LEAVE your bike ALONE. Learn to RIDE!
Yep.
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