I just put my motor back together in my speedster, it's a 1835, stock cam, crank, heads (except for SS 40mm intake valves), and it has dual 36 dellortos.
The engine ran great when i first started it up, and after syncing the carbs, setting timing (30*deg total at 3000rpm), and changing the oil i drove the car 200mi and it ran like a dream. The next day i drove the car and all of a sudden one carb was backfiring thru the carb. Float height was set (actually i had to replace a float in one carb; it was cracked) and put a new needle/seat/gaskets. I had to limp it home, and when i was tuning the carb when i got home, which was at night, all of a sudden the rpm's went really high, idle was at 2000rpm, and i look at the carbs, and there was fire inside the air cleaner!!!!! man that was scary!!!!!
Everything with the carbs is set properlly, timing like i sad was set to 30 total, float height was set proper at 5-6mm holding the carb top vertically, and with 12mm drop, all mixture screws turned 3 1/2 turns out to start, and the linkage was disconnected from both carbs, then i sync the carbs (with a good snail type syncometer) and everything seems fine. A little history, this carb had what looked to be the same problem with the PO, and the only thing i found was that the float was cracked, so i replaced that and it stopped the flooding when you shut the car off, but now it's still poping thru the one carb barrel that caught fire for a seccond, and that carb is pulling a slightly less amount of air on the sync meter than the others but very little less. I've had the whole carb apart, cleaned it, new gaskets, float, o-rings, ect....and i can't figure this one out. I checked the two jets from the top of the carb that can be removed and they are clean. Fuel pressure is 3PSI, i'm stumped. :? :(
i ordered the dellorto tuning book but it won't be here for a week, anyone have any ideas????
thanks.
martin
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