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| Joined: | 03-11-2005 |
| Location: | San Anselmo, California USA |
| Posts: | 983 |
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As I have repeatedly posted, the smooth running of Dellortos is directly related to the idle circuit. The idea is to get the idle jet into the correct range and then find the correct idle jet air corrector ( idle jet holder) for optimum performance. The original JH jetting had a lean corrector. If you use this your car will never run right. Try a 7850.7.
The Des Hammill book explains this in detail but takes several readings to understand.
The cheaters way to adjust air correctors is to drill them out to the next size using machinist's bits using the guess and check method.
If your car runs well to 3500 rpm and then has issues, it's time to focus on the main jets and air correctors. The mains have no effect at low rpms.
The adjustment screws are more for micro adjustments and will not make a lousy jetting job run better.
Good luck, Kurt