Single Carb Set Up

['OlGuiltyBoy]

I WANT ONE !!!! It is possible - I don't want to hear the negatives, just what kind of carb to run.

[cywelchjr]

It's something that a discussion has been going on about. Nobody that we know about has done so with any degree of success. The one I have seen ran horribly. The problem is (and not talking negatives here) is there isn't enough room for a plenum to put the carb where you would need it to work properly.

['OlGuiltyBoy]

I've seen one with a plenum that runs along the intake side, and then coming around almost at a 90 degree angle is a single carb. Also wouldn't mind just a dual carb setup - would be even better than a single.

[cywelchjr]

I've seen one with a plenum that runs along the intake side, and then coming around almost at a 90 degree angle is a single carb. Also wouldn't mind just a dual carb setup - would be even better than a single.

I think I've seen that setup, heard it run too, runs like donkey dung. No way with that setup to get anything approaching even fuel mixture on all 4, with the ones closest to the carb being rich and the ones farthest away being starved for fuel. Duals might be possible, but you still end up with having to sync them, and anything less than 1 per cylinder is going to perform less well, so unless you could get down to 1, I can't see it worth the time to figure out how to do it.

I'm working with some others, in a slow mode to figure out if we can do a single carb mod, but I'm not going to spend any time on figuring out the how to on doing a dual carb setup. A single carb setup would actually be easier from a setup standpoint if you can come up with an intake that works, the duals would to actually work right I think really need to pair 1 and 4 and 2 and 3 together and pairing 1 and 2 together and 3 and 4 together would give asymmetrical intake pulses which are not as good for carb operation.

['OlGuiltyBoy]

Yea, I don't really care what it sounds like, as long as the things has some upgraded power. Wasn't the carb on that single intake an old car carburetor?

[cywelchjr]

Yea, I don't really care what it sounds like, as long as the things has some upgraded power. Wasn't the carb on that single intake an old car carburetor?

You will NEVER get upgraded power from a single carb VS a multi carb setup. The single carb setup is easier to tune, but it's never going to give you the power that multi carbs will, which is why all the high power engines where the goal is nothing but power run multiple carbs.

['OlGuiltyBoy]

You will NEVER get upgraded power from a single carb VS a multi carb setup. The single carb setup is easier to tune, but it's never going to give you the power that multi carbs will, which is why all the high power engines where the goal is nothing but power run multiple carbs.

Yea, that is true. I gotta look into individual carbs, not like a "bank" ya know but the ones you can take one off at a time I guess like the drag bikes have. Those have a single fuel line to each one though, dont they?

[cywelchjr]

Yea, that is true. I gotta look into individual carbs, not like a "bank" ya know but the ones you can take one off at a time I guess like the drag bikes have. Those have a single fuel line to each one though, dont they?

That would be a real pain to get hooked up and working, there IS a reason they do them in banks, it keeps them working together. Just imagine getting 4 throttle cables all working together exactly the same at all settings. I'm not sure it can even be done, not for a price that wouldn't likely be multiples of the value of the bike.

[Manveru]

I think I would rather do Fuel Injection over anything that you are wanting. I know I have seen some kits for FI Modifications, but even that takes away from the pretty much stock bike that I have now.

The carbs can be a pain to work with, but when you have them set.. Watch out

[cywelchjr]

Yep, if you get these carbs running well, they run really well. Even with the 750FD, this thing is still capable of pulling that front wheel off the ground in 1st gear if I get too heavy with that right hand. It just won't do it in 2nd gear anymore. Maybe I can't beat the latest crotch rockets, but then I'm not that kind of rider anyways.

['OlGuiltyBoy]

That microsquirt FI conversion thingy just seems to be such a pain though! And the single carbs, I wouldnt mind tuning it myself, I do my own work, I dont pay someone else to do anything but change the tires. Im just going through all my options, I want to have my mind set on the best things to do so that when it comes next season im ready.

[Eveready1100]

My old H2 triples had single throttle cables that branched into three which had their own individual adjusters on each segment. They weren't too hard to keep in tune. Mightn't be too difficult to make a 4 banger version.
It'd be impossible to keep carbs in synch for long using 4 totally individual cables.
About the only other way to go for ease of tuning, individual runners so intake pulses aren't fighting each other and maybe get more power (probably about 20mpg, though) would be to open up the intake & exhaust ports, bigger valves, large diameter exhaust system and a custom set of intake runners, and slap a pair of these on it!

[hamjam]

webber 45 DCOE so nice to work on but.... no room for them and they work best with a long manifold

['OlGuiltyBoy]

My old H2 triples had single throttle cables that branched into three which had their own individual adjusters on each segment. They weren't too hard to keep in tune. Mightn't be too difficult to make a 4 banger version.
It'd be impossible to keep carbs in synch for long using 4 totally individual cables.
About the only other way to go for ease of tuning, individual runners so intake pulses aren't fighting each other and maybe get more power (probably about 20mpg, though) would be to open up the intake & exhaust ports, bigger valves, large diameter exhaust system and a custom set of intake runners, and slap a pair of these on it!

You could make room for these if you moved the battery - the custom swing arm I am having made has the option to put a battery tray or nos holder on it. I like I like!!!!

['OlGuiltyBoy]

webber 45 DCOE so nice to work on but.... no room for them and they work best with a long manifold

If you basically did a custom/longer exhaust I think these would work fine. The hunt is on!!!!