OK, good you have an updated petcock. We need one one piece of information before we can eliminate the petcock. On the right side of the carb, on the forward end there is a hose fitting. That fitting should have a rubber or plastic cap on it. If the fitting is exposed/open, you will need to block that. If it is blocked, we can move on.

Do not rejet the bike just yet. A main jet being off by a size or two will not result in a bike that will not rev out. However, a drilled main is what size? Moreover, a jet should have a near-polished ID. Did the previous owner use a hand drill, a press, a ream...we don't know. Let's inspect a few static items before we go chasing unknowns. If you get the bike running well, you "may" want to swap out the drilled jet. Do you have an aftermarket exhaust and/or airfilter on the bike? That kind of helps to zero-in on the correct main jet. But like I said...there are other things to check first.

A fouled spark plug is "unlikely", but it is possible. For the sake of good order you could replace the plug and eliminate a variable.

To inspect the diaphragm you can just simply rotate the carb. To rotate the carb you can remove the throttle cable and fuel line. Loosen the forward and rear clamps and twist the carb to the right side of the bike. From there you can remove the top plate of the carb and inspect the slide area. If the diaphragm is damaged or dry, it gets replaced. There is no way to repair this.

Let us know what you find.

retro wrote on 04/13/21 at 07:27:44:


And how about the airfilter?

Zepp wrote on 04/13/21 at 08:13:30:


Wouldn’t know how the heck to get to the thing

Gary_in_NJ wrote on 04/13/21 at 09:07:54:



Yeah, I’m thinking maybe it was the culprit of all this...I have a 150 main jet in my hand. The bike came with lots of other stuff. Including new parts and old parts. One of them was the bag of jets he bought (idk where from) and used. I think. It says “D150” on the side of the jet.

Also, I just got my tags today!

I also need to know the tire sizes that fit this bike as mine are old...and the best priced ones..lowest, actually.

retro wrote on 04/13/21 at 10:35:17:


I altso have a carburator problem I think, but it only appears on first startup at spring, my exhauste get bluer every spring.

The tires is ;
Front tire size      100/90-19M/C 57H
Rear tire size      140/80-15M/C 67H

https://bikeswiki.com/Suzuki_LS650_Savage_(Boulevard_S40)

I got 150/80 on my rear tire!
And the brand is Bridgstone Exedra MAX for both.

Gary_in_NJ wrote on 04/13/21 at 09:07:54:


I put my big gal panties on and took the carb off. It was an interesting process. Annoying and I’ll probably need help getting it back on.
But he had a 130 in there. I keep trying to get it out but it keeps just going and going and screwing and screwing moving nowhere. Idk what I did. (my fault..I don’t know how to get it unstuck.) but the diaphragm is flawless. The carb is very clean. Everything seems to be in order. No clogs or anything. I need to get this get out ASAP!

The float, I’m not sure how to measure it. I never had to do it.

To measure the float height you need to balance the float to the point where it is just touching the needle valve, and then measure the gap between the flange of the float bowel to the closest point of the float itself. Check the How-to section, there are photos.

Typically the air jets under the diaphragm are left in place.

The jets are threaded, so just like a bolt or screw the are screwed into place until they are well seated. Keep in mind that the jets themselves are brass and will strip very easily. So when it bottoms out...stop turning.

https://imgur.com/a/9PwkxYk



Let me know if you can’t see the album!