Pelican Parts Forums - View Single Post - Too much back pressure (too small of exhaust outlet). What size output is took small?

Joe Bob · Joe Bob's Garage

You burn a valve if you go too lean on your gas mixture. Do you or your mechanic have access to an exhaust gas analyzer? IF your SC still is using CIS fuel injection, fuel gauges and an analyzer is how you determine engine tune.

If you go too lean, you CAN fatten up the mixture with a hex key under the air box at the throttle body. You might want to purchase a few books on CIS, and the Bentley manual. Keep up with your "mechanic" such as he is....not rocket science.

BTW, how is the gas quality? Are you running straight ethanol/sugar based fuel?