Aircooled wont rev! HELP Please

[triantis]

Need help from all who have experience with the 650 air cooled motor. Yesterday my car was running fine up until i took a corner a little quick causing the motor to stall. After starting the engine again all i can do is rev/run the engine using the choke. If i even touch the accelerator slightly the motor bogs down and attempts to stall (holding the accelerator down will stall the motor!). The only way the engine will now run is with the choke on full. I have done the following:

- Pull apart carby to see that the fuel bowl is FULL (pump working fine)
- Clean out the fuel bowl
- remove the small screw at the bottom of the fuel bowl and clean
- Remove 2 x needles, clean both and clean holes in which they sit
- Replace both gaskets (underside of carb and underside of spacer)
- Disconnect each lead with motor running (both cause the motor to idle rough - spark in both cylinders)
- Block top of carby while engine is running. The motor stalls indicating good vacuum

The only way i can get the motor to rev is by holding open the throttle and quickly pouring fuel into the carby.

What could be the problem??? It sounds like the carby is not drawing the fuel through?

[nrg19uk]

Check your timing

[Kent126]

I had the same thing. Replaced fuel tank, lines, pump, cleaned carb, new spacer and service kit and it runs fine now.

[smallcox]

Hi,

This sounds like you didn't have a fuel filter fitted

If all ok until you hit a bit off hard cornering then sounds like you have a partily blocked jet in  the carb, carb strip down to check would be the answer in my view.

I some times rev the engine hard then hold my hand over the carb mouth as this draws the blockage through the carb until the engine stalls, the only problem with this is if its really blocked this will not work.

[ChrisRLewis]

Does sound like a blockage in the carb jets, like others are saying it's worth fitting an inline filter.  Try striping the carb and get an airline to blow through the jet and cavities.  If you don't have an airline use a small rubber tube to blow through instead, also use carb cleaner (aerosol) for finishing off.