cyclone 340

fordmtrsp · Post by **fordmtrsp** » Sun Dec 07, 2008 8:16 pm

I have purchased a cyclone 340 with a burnt piston that has 440 jugs on it . I think the reason it is melted down the carb only has a 350 main jet shouldnt it be bigger with 440 jugs? Also if I am to rebuild it do I order a 440 gasket set? Please help if you have any answers let me know Thanks!!

JDT · Post by **JDT** » Sun Dec 07, 2008 8:59 pm

As it has one carb one would assume that if it was a jetting problem it would affect both pistons.

You may well have a bad crank seal which would only affect one side.

A complete teardown would be in order and a 440 gasket/seal kit.

And the proper jets.

fordmtrsp · Post by **fordmtrsp** » Sun Dec 07, 2008 9:04 pm

The pto side seal and every thing looked good and that was the side that had a hole in the piston and the seal on the mag side was ok but the spring in the seal was broken. what size jet should i use with a 340 carb with 440 jugs? the air box was gone so im pry going to buy a uni filter from dennis kirk un less you have any other ideas?

JDT · Post by **JDT** » Sun Dec 07, 2008 9:08 pm

I have no clue as to what jet would be recommened without the airbox.

If the spring is broke the seal is broke. Seals are cheap, replace them both.

harleysportster · Post by **harleysportster** » Sun Dec 07, 2008 10:12 pm

To help indentify the engine, look at the aluminum mounting plate for the ignition coils. The plate on the 76 engine bolted behind the carb at the bottom, the 77/78 bolted to the intake manifold above the carb. Check out the FAQ section, the carb specs are listed there.

fordmtrsp · Post by **fordmtrsp** » Sun Dec 07, 2008 10:23 pm

Its bolted to the carb flange