All of this came about after cam install. Cam came awhile after the other mods did and it ran great with factory cam. I’m gonna order a tillotson TCT carb since they are adjustable and go from there.
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Check to make sure the engine doesn't have a rev limiting coil
RPM Limited Coil 5250 RPMs Predator 212 GX200 196cc Clone
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std spring will still pull upto 5000rpm on a std cam, high lift cam requires stronger springs. If you've done that, look at fuelling, let the fuel flow from the tank without cap on, then with cap on, should still flow. Carbs are restrictive, a decent 22mm will reap rewards. Be careful not to rev past 6000rpm, flywheel magnet could become detached. A 6 degrees offset key will help with timing and power
How big is the TCT carb? I thought I recently heard is was 12.5mm. I think a stock carb is 15mm. I’m not sure this is the route I would go, but not sure what I’d do to fix it.
Yup, you’re correct so the TCT is a no go. I guess I’ve either got to just go the VM22 route or set engine back up stock. I will update with what I figure out but in the mean time thank y’all! I’ve also been seeing a lot more oem flywheels coming apart lately so we’re not gonna be playing very hard until the billet flywheel/rods are put in the bikes.
They make some short adapters that can allow a gx390 carb on a clone engine. I think the gx390 carbs are closer to 22mm but could be wrong. A 390 carb on a clone isn’t great for stop and go. Hard to tune the “just off idle” (1/8 - 1/4 throttle) portion of the throttle range. I used a 390 carb once, now I only use slide style carbs. Ignore the methanol wording, photo just to show the carb and adapter.
Man I didn’t take any but I’ll be doing another in next couple days and I will post pics. I used hyper tough 12volt cordless rotary tool from Walmart and a $20 carbide bit set I got off Amazon. Worked good but have to be really careful around the valve seat.
Drill works great for me. I’ve lapped many sbc heads the same way. Just put compound on the seat then a little on the valve edges and hold pressure on the valve. Wipe away and clean with brake cleaner. For me it wasn’t the carbide bit I had to keep from the valve seat but the part you tighten after the bit is installed! It’s easy to let that sucker hit.
What size rotary tool did you use? Anything bigger than 1/8” is tough since those runners are so small!
