I have a 1991 Suzuki King Quad 300.
I bought it not long ago, and it has never run right. I bought a new diaphragm for it. It's sealed in that department.
It barely ran good before, and actually I got it to run fairly good, with a good pull with a clamp in air cleaner.
I put a snorkel on it, making sure to use pipe that would allow an ID as big as the carb intake flange, so there's no restrictions, and the same clamp on air cleaner.
I went through the carb again, even put a top quality Japanese rebuild kit in it.
It starts and idles perfectly. Has good power from idle to about 1/3, then anything past 1/3 throttle, or thereabouts, it just bogs down and completely dies. If I pull the choke in, I can get it to half throttle without it bogging down or dying.
It pops and backfires and sputters the whole time, then past a certain point the engine acts like I hit the kill switch.
It IS getting gas in the carb by the way, I put on a electronic fuel pump which helped things immensely. I put on a fuel pressure regulator and got the fuel to around 2 PSI.
I am at about 5,500 feet elevation, and the main jet is a 120.
I am considering coring out the main jet to a larger size to see if that helps anything. This quad is already such a gas hog, but maybe if it is jetted right it won't be so had?
Edit: It does actually run a tad better when it is warmed up.
Hi, I have a 1991 King Quad that I bought that needed "carb work". So I bought a rebuild kit and installed it, checked and set float height.
It idles okay, but when I give it gas it stumbles all over itself. On full throttle it suddenly comes alive and pulls and pulls.
It is rideable, but only marginally.
So I was examining the slide and diaphragm, but at the bottom of the slide, there are three holes. One in the middle for the needle, and two on each side of it at the bottom of the slide.
What are these holes for? I can see daylight through them so no vacuum is being formed in there, it is being sucked out of the two open holes. Is there a spacer or something that blocks these holes? I might try filling them with silicone and seeing how it runs with it in there, because it is not running right right now. It acts lie there' no vacuum pulling the slide up, only at WOT.
At the end of last Winter my snowplow cable broke and now I finally need to get around to replacing it. Original cable was 1/8" but I think I can upgrade to 3/16" - anyone have any experience there? It's a Yamaha branded plow w/ a Warn (I think) manual lift.
There's a ball-end on the cable, so not sure if that complicates matters and I need to get a pre-made cable.
Appreciate any insight