Your VM22 from GPS appears to use Kehin pilot jets. The 38 Kehin is about the same as a 15 Mikuni The original mikuni pilot that came in these carbs had an OD on the thread of .150 some of the Kehin used a 5mm or 6mm thread size. Can you measure the od of the threads on your pilot? That would help with finding what pilots yours has.
Stage 2 Predator 212 Will not start nor run right. Please help me!!
- Thread starter adelminibikeman
- Start date
The jets that are currently installed in your carb are a good baseline jetting that should work in most applications . Your carb does not have a choke but an enrichment system that adds both air and fuel (in a rich mixture) to your carbs pilot system. It is on when the brass plunger is pulled up. The fact that it will only run with the enrichener is on and shuts off when closed means a lean condition, sounds like you have an air leak.
So, I took off my Mikuni along with my manifold. Reverted all the jets to stock. Looked through my main jet hole and saw light through it. I scraped off everything I could to make it flat and make sure there was no left over gasket. I cleaned off the manifold and all the gasket from there. Then i carefully put it on to the carburetor to line up the o-ring (check picture). I then put a brand new gasket on and put it on my bike. After hooking up the throttle cable i fed it some gas. Upon trying to start it the same exact problem persisted; still not starting unless on choke and with a little throttle. I try leaving it running for 2-3 minutes or so before turning choke off. Still nothing it dies instantly after turning off the choke. Now I see that there is gas pouring out one of the vent tubes coming out of the carburetor on the bottom. I now try to do the same thing and it’s not starting. It’s only staying on with some throttle. Then all of a sudden, white smoke just pops out of the carburetor. I’m going to attach a youtube link with a video of it happening. Luckily i recorded so you guys can see exactly what’s going on. Really hope I didn’t mess up the engine. Thanks. (Also, I do have an exact same carburetor as this one laying around, brand new unopened if that’s needed) video link:
Attachments
I'm wondering why and how it stopped leaking after about 27 seconds into the video.
He shouldn't have to be in there tweaking the float on a new carb. GPS had it open to put a 130 jet in there and should have verified the float adjustment while it was open. In their video they suggest half to 3/4 out on the idle mixture screw. Why wouldn't it come already set that way? And if they were good they would put the idle (slide) screw in a known good starting position.
The GPS kit is $98. For the extra $60 over an Amazon kit they should have it completely setup at a base line for their customers. Otherwise, you are paying $60 for a 130 jet and "GPS" etched onto the carb. These VM22 clone carb kits are $30 on Amazon. I'm sure it's possible to get a bad one. But the two I got worked once set up and tuned.
He shouldn't have to be in there tweaking the float on a new carb. GPS had it open to put a 130 jet in there and should have verified the float adjustment while it was open. In their video they suggest half to 3/4 out on the idle mixture screw. Why wouldn't it come already set that way? And if they were good they would put the idle (slide) screw in a known good starting position.
The GPS kit is $98. For the extra $60 over an Amazon kit they should have it completely setup at a base line for their customers. Otherwise, you are paying $60 for a 130 jet and "GPS" etched onto the carb. These VM22 clone carb kits are $30 on Amazon. I'm sure it's possible to get a bad one. But the two I got worked once set up and tuned.