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Differences between carbs

  • Thread starter Thread starter Clumzi
  • Start date Start date
I have a 650 with single disc front brake. That means nothing. ALL of the jets in the 650 carbs are bigger than your 550 carbs. This MIGHT work. It more than likely gonna run rich. Get some pods, you should be ok.
 
Why are you so set on the 650 cars anyway? Rebuild your 550 carbs (properly) and ride...
I don't get it...
 
No, the "idle mixture adjustment screw" is the new bit. Most people just seem to refer to the thing as the "air" screw. When folks were talking about it being the "mixture" screw, I figured it played a role in the air fuel mixture not just at idle but straight through the rev. Now I know :).

The pod comment is interesting. To flesh this idea out, are you saying that if I removed the intake and exhaust bottlenecks, ie pods and aftermarket 4 in 1, that the richer fuel mixture might be beneficial?
 
Clumzi said:
No, the "idle mixture adjustment screw" is the new bit. Most people just seem to refer to the thing as the "air" screw. When folks were talking about it being the "mixture" screw, I figured it played a role in the air fuel mixture not just at idle but straight through the rev. Now I know :).

The pod comment is interesting. To flesh this idea out, are you saying that if I removed the intake and exhaust bottlenecks, ie pods and aftermarket 4 in 1, that the richer fuel mixture might be beneficial?
Click to expand...
On the earlier VM carbs ('79 and older Suzukis), there is a 'fuel' screw and an 'air' screw. As detailed above, the BS carbs have a 'mixture' screw. Too many people get confuzzled with their terminology and call them by the wrong names. :oops:

Yes, if you removed the bottlenecks, you will need a richer mixture than the 550 jets could provide, but based on the jet sizes listed in the carb sticky (quoted in post #12) the 650 jets would make it too rich. For example, the 550 main jet is a 92.5. For just pods, you might want a 97.5. For just a header, it might be a 100. For both of them, maybe a 105. The 650 comes with 110 jets, two sizes too large. All the other jets tell the same story. Please accept the idea that stock is not so bad. If you want other than stock, you will need to be buying different jets than you have in either set of carbs.

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Alright, so we add pods, header and a turbo! How about then?

lol, I've no doubt you're right, I'm just being lazy. I'ma have a clean set of 650 carbs on my hands and I'm gonna want to throw those right on the bike instead of ripping another set of carbs apart. Right and wrong's got nothing to do with it. I'm a broke grad student, time and money are in short supply and doing things that are less than bright with a motorcycle two years older than I sounds like a good idea :).

BTW - thanks a bunch again. I don't want you think I'm not listening. I'm just curious.
 
Clumzi said:
Alright, so we add pods, header and a turbo! How about then?
Click to expand...
Ahhhh ... HORSEPRESSURE. :dancing:

There again we get into problems. Are you doing a blow-through-the-carbs install or a suck-through-the carbs install? Yeah, it makes a difference. Either way, pods are out, as you will only need one filter. With a blow install, you will only need one filter for the turbo, which will then blow through all the carbs. You will also need to make a sealed box to house the carbs so the float bowl vents see the added pressure, too. With a suck install, You will only need one (larger) carb on the inlet of the turbo, therefore only one filter.

Header is another issue here, as standard 4-into-1 headers won't work. Depending on whether you mount the turbo in front of the engine or behind, you need to get all four cylinders into one pipe as quickly as possible and route that to the turbo, then you will have a single exhaust from the turbo back. The more-common location is behind the engine, where the carbs and airbox currently live.
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KZ1300turbo.jpg


Yeah I figured that was a facetious question, but I just thought I would take it and run with it. Just shows that your problems still would not be over.

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you, sir, are a nut. But I've gotta say, you are my kind of nut! -nick
 
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