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| Joined: | 03-11-2005 |
| Location: | San Anselmo, California USA |
| Posts: | 983 |
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Hi Brett,
Is your car stock? Eurocarb says the stock JH needs 33mm chokes.
The idle circuit is the most critical of all on the Dellorto carbs. The running up to 3000 rpm is facilitated by it. Your idle jets should be OK at 55 so the issue is probably the idle jet emulsion tubes. The 7850.5 is LEAN which causes the spitting back. I suggest you go to http://www.dellorto.com and purchase a set of 7850.7 idle jet emulsion tubes. This should get the car running.
If it runs too rich you can always drill out the correction holes to the next size. I actually soldered up my 7850.1 and re-drilled it until I got satisfactory results.
If there's a lack of power after about 3000 rpm you will need the main jets and air correctors as Jim Ketcham has posted.
Any performance modifications (or engine wear) will affect the tuning. When I install my 107 cams I plan to use the 35mm chokes (I currently run the 33s) and will have to re-jet.
Good luck,
Kurt