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- Location
- Portland, Oregon
Factory setting for the wt-990 is L:1 1/8t and H: 1 5/8t. I'm running mine at sea level and it's pig rich on a stock 26cc fuelie (CY), but it does start without much hassle. I would think that at sea level with a larger bore motor, the stock settings would be right on point. At your altitude if your plug isn't wet-ish after 15 or so pulls, you might be running too lean. There's also the chance that the carb is old and the internal diaphragm is dried out and cracked, but mine has been sitting for 5 years and isn't having an issue, Maybe I got lucky. Could also be that you got one of those older engines where the cylinder plating was crap, and it's now completely hammered on the inside.
I would go this route, if I had two motors in my shop:
Yank the Gizmo exhaust and check the cylinder with a flashlight for any obvious cylinder plating damage.
Check the ignition coil for spark. Compare with the G320.
Change the carb from the Gizmo to the G320 and see if the G320 exhibits the same problems.
If the G320 runs fine with the 990, which it should. I would pull the head off the Gizmo to get a closer inspection of the cylinder and piston. It could be a plating issue, but it could also be the head gasket had a weak spot, or the head bolts weren't torqued down correctly and running just above idle created a leak. If that's the case, a $6 head gasket should get that puppy ripping along.
Best of luck!
I would go this route, if I had two motors in my shop:
Yank the Gizmo exhaust and check the cylinder with a flashlight for any obvious cylinder plating damage.
Check the ignition coil for spark. Compare with the G320.
Change the carb from the Gizmo to the G320 and see if the G320 exhibits the same problems.
If the G320 runs fine with the 990, which it should. I would pull the head off the Gizmo to get a closer inspection of the cylinder and piston. It could be a plating issue, but it could also be the head gasket had a weak spot, or the head bolts weren't torqued down correctly and running just above idle created a leak. If that's the case, a $6 head gasket should get that puppy ripping along.
Best of luck!