VM33 smootbores

79MKII wrote:

...was thinking I could make a fuel level gauge with an old plug....

My rig is a conical rubber plug with a hole through it.
A length of flexible clear tubing fits snugly in the hole.
The plug fits into the carb drain, and held there, with tube held against float bowl, while determining the level.
Fast and easy, and quickly moved to next carb.

Fitting a nipple to a spare drain plug for the tube attachment would be way too professional for me. :lol:

Good Fortune!

79MKII wrote:

...The plugs listed on Z1E only say they're for the 29's and they don't have any listed for the 33's....

Yes.
And Z1E lists separately a different 33's drain plug 0-ring (instead of the same 0-ring shown with 29's drain plug).

Good Fortune!

I might just try that rubber plug thing - sound like it would work pretty well.

not sure if i should have just started new thread, but you guys seem to know allot about these carbs.

hoping someone can help me out.

I run in scca in a legrande mk18

car is powered by a gs1100 with 1260 big bore kit and has the vm33 smooth bore carbs.

having an issue with the carbs i could use some help with.

carbs have 17.5 pilot
.06 air jet
6dj30 needle
261 - 08 needle
1.5 slide

running on the lean side, went up from 130 mains to 140 and got a little better, but when i went up to 150 it made no change, im assuming im limited by the needle jet ?

im trying to get down to an air fuel ratio of between 13 to 14:1, cant seem to get lower than 15:1.

idle runs at 15:1, part throtle to 9500 runs 14:7
appreciate any help.

I think starting a new thread is a good idea, with lots of pic's! That should get everyone's attention. They call it KZ Porn, :laugh:

legrandemk18 wrote:

not sure if i should have just started new thread, but you guys seem to know allot about these carbs.

hoping someone can help me out.

I run in scca in a legrande mk18

car is powered by a gs1100 with 1260 big bore kit and has the vm33 smooth bore carbs.

having an issue with the carbs i could use some help with.

carbs have 17.5 pilot
.06 air jet
6dj30 needle
261 - 08 needle
1.5 slide

running on the lean side, went up from 130 mains to 140 and got a little better, but when i went up to 150 it made no change, im assuming im limited by the needle jet ?

im trying to get down to an air fuel ratio of between 13 to 14:1, cant seem to get lower than 15:1.

idle runs at 15:1, part throtle to 9500 runs 14:7
appreciate any help.

That's a pretty small pilot for those carbs. Put 25's in it and see if that doesn't help.

On a 1200cc Kawasaki, I ran 130 mains with O-6 needle jet, .9 air and 30 pilots. Generally those carbs like the smaller needle jet but with your A/F I wouldn't suggest them.

The 29s with the 2.0 mm cutaways are designed to be run on Suzukis. Kawas need the 1.5mm cutaway. BUT, I have a set with the 2.00 mm cuts and on top end this thing ripped up the back roads and hit red line in every gear except 5th. I have changed my front sprocket gearing down 1 tooth to 14, and will test it soon to see if this will improve the top end; as it has always done well for me on any other bike I have used. I always go down 1 tooth on the front, and in almost every case find the bike to run a better top end than the original factory front sprocket set up.

You have too many guys out there telling you that a carb needs those 17.5 pilots. Look, anytime you open an engine up with greater airflow you have to change all jetting. It is a question of simple physics. The 17.5s were run on factory tuned bikes with a factory airbox and pipe. When you open that thing up with a ported head, or a bigger bore and a pipe, especially if you run pods, you have to up the jetting. The rule that I learned was that on mains you need to go up at least 20%. My stock engined Z1000 ran 29mm smoothies on it and I ran 125 mains in it and it ran like a scolded dog, but the pilots were way too lean, so after I bored the engine to 1075 and went with .410 cams I had to go all the way up to a 35 pilot in order to get the thing to even hold an idle below 1500 RPMs. You might also want to give Monty Campbell a call out in Alto Loma, CA. He is an expert on carbs and offers a boring service that takes the 33s out to 38mm and he adds a fifth fuel circuit to them and you will see a HUGE improvement over the 33s. Hope this info helped you at all.
drcampbell3@juno.com. or 1(866) X-Pipe.org (1(866) 974-7367). Great guy who knows his stuff.

I've got 25 pilots in my 33's right now - had 30's in my last set up. They run great! Couldn't imagine 17.5's with any mods at all.

79MKII wrote:

I've got 25 pilots in my 33's right now - had 30's in my last set up. They run great! Couldn't imagine 17.5's with any mods at all.

And FWIW, The Suzuki 29's with the 2.0 slides work excellent on KZ 900/1000 motors, especially after the head is ported.....

Larry C

Z1000Lover wrote:

You have too many guys out there telling you that a carb needs those 17.5 pilots. Look, anytime you open an engine up with greater airflow you have to change all jetting. It is a question of simple physics. The 17.5s were run on factory tuned bikes with a factory airbox and pipe. When you open that thing up with a ported head, or a bigger bore and a pipe, especially if you run pods, you have to up the jetting. The rule that I learned was that on mains you need to go up at least 20%. My stock engined Z1000 ran 29mm smoothies on it and I ran 125 mains in it and it ran like a scolded dog, but the pilots were way too lean, so after I bored the engine to 1075 and went with .410 cams I had to go all the way up to a 35 pilot in order to get the thing to even hold an idle below 1500 RPMs. You might also want to give Monty Campbell a call out in Alto Loma, CA. He is an expert on carbs and offers a boring service that takes the 33s out to 38mm and he adds a fifth fuel circuit to them and you will see a HUGE improvement over the 33s. Hope this info helped you at all.
drcampbell3@juno.com. or 1(866) X-Pipe.org (1(866) 974-7367). Great guy who knows his stuff.

IMO that's waaaaaaaaaaaaaaayyyy too much pilot for 29's.

I have run 25s in it and it still won't run right. But the 35s have helped a bit. I had a buddy that had a 79 LTD with the same 1015cc motor. He went to a Kerker pipe with pods, and his did not run worth a crap on low end til he piloted it up to 35. And his carbs were the stock 28s with pumps.