carb disasembly

bkmarsha · Posted: April 2, 2009, 1:59 pm Post subject: carb disasembly

i am having trouble removing the the brass jet (i believe the main jet) that is located under the drain plug

i am hesitant to crank on it to hard with a screwdriver because i am afraid to damage it

is there any need to remove it unless i am changing it or is spraying carb cleaner in there good enough to get it clean

BigGeorge · Full Member Joined: Apr 13, 2008 Posts: 267

You should remove the float bowl because if you have crud in the bowl spraying the main jet with carb cleaner is not going to solve your problem..To remove the jet you need a flat bladed screwdriver that fits tightly in the slot in the jet with no slop.. You can grind or file the tip of a flat screwdriver to accomplish this... A thorough cleaning of the carbs will require removal and complete dissassembly, soaking metal parts in carb cleaner and blowing passages out with compressed air... Its not that hard to do............BG

bkmarsha · Posted: April 2, 2009, 2:27 pm Post subject: Re: carb disasembly

i have completely dissembled and cleaned the entire carb but just cant get out that one jet

would wd40 or some type of penetration lube help or is that not good to use on the carb

BigGeorge · Full Member Joined: Apr 13, 2008 Posts: 267

The problem is usually varnish that gets between the threads of the jet and the aluminum body and glues the jet in place so to speak. I had one that was almost impossible to get out so I soaked it overnight in 1 gallon pail of Berrymans chem dip... Next day it came out no problem... Are you changing the main jet up or down in size or just want to make sure its opening isnt clogged?

bkmarsha · Posted: April 2, 2009, 3:02 pm Post subject: Re: carb disasembly

right now i am just cleaning but i feel that i may need to put in a biger size but clean in my priority right now

yamaman · Posted: April 2, 2009, 3:13 pm Post subject: Re: carb disasembly

You could probably try throwing the whole thing in the freezer for a few hours, pull it out, throw a glass of water over it & undo!

bkmarsha · Posted: April 2, 2009, 3:28 pm Post subject: Re: carb disasembly

well i got one of them out with some penitration oil and now i am on to the next one

it looks like someone in the past has tried to get it out and has buggered it up pretty good

any ideas how to get it out if the head is messed up

gordo · Posted: April 2, 2009, 3:49 pm Post subject: Re: carb disasembly

They can be drilled, BUT extream caution should be used, as the passage can be damaged IF you hurry. Preferably a drill press & then an 'easy out' tool can be used.If you take your time,drill straight into the jet leaving enough of the jet for the easyout to bite into,it should come out. Some times a 'left hand twisted' drill bit is sufficeint.

yamaman · Posted: April 2, 2009, 6:17 pm Post subject: Re: carb disasembly

I'd try & make a new slot, or repair the one you've got before I got the drill out!

If you drill (maybe take it to a shop with a drill press?) make sure you use a vice (soft jaws of course), an exact centre centre punch and a drill depth gauge/limiter.

DON'T use power tools with easy-outs, that is asking for trouble!

bkmarsha · Posted: April 3, 2009, 6:22 pm Post subject: Re: carb disasembly

is a bigger jet number richer or is a smaller jet number richer

yamaman · Posted: April 3, 2009, 6:31 pm Post subject: Re: carb disasembly

Bigger number, bigger hole, is richer!
Don't forget, main jet (and air screw) is just top end, 1/2 to full throttle, it should be suited to your top speed.
The needle jet & jet needle look after between 1/4 & 3/4 throttle
Pilots up to 1/4 throttle

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