Suzsmokeyallan wrote:Cabz you missed it, the 73 carbs with the tall caps carry o rings on the base of the airscrews under the spring and the parts diagrams i have show it clearly.
The part number you want is three o-rings, 13295-33010 specific for the K model carbs only.
hmmm well I will pick some up and give them a try. what about the large cap/slider seals? are there such a beast?
I finaly found a site with a breakdown on my carbs, I was looking for priceing on the air screw orings. I noticed that they list them for carbs stamped 31015 and up, mine is are stamped 31013. will this make a diffrence? or do I have an eariler carb than most 73's.
Suzsmokeyallan wrote:My parts listing does not show the o-rings as being offered for a particular serial number of 73 carbs. They shown as listed for ALL 73 carbs.
the only one I could find was on a parts site, I jsut figured I would check before ordering some
Ok I'll bite, again. Are the filters lightly oiled? They should be.
Have you tried turning all three air screw in a further 1/8 turn to see what difference if any that makes, and then another 1/8 turn. And if it makes it worse, try backing the screws out slightly and all by the same amount.
Those carbs are usually not too bad for surging, though all large two strokes tend to do it to some extent.
If screwing the air screws in makes things better and you end up with them in more than 1/2 turn from stock, then try a set of pilot jets one size larger.
tz375 wrote:Ok I'll bite, again. Are the filters lightly oiled? They should be.
Have you tried turning all three air screw in a further 1/8 turn to see what difference if any that makes, and then another 1/8 turn. And if it makes it worse, try backing the screws out slightly and all by the same amount.
Those carbs are usually not too bad for surging, though all large two strokes tend to do it to some extent.
If screwing the air screws in makes things better and you end up with them in more than 1/2 turn from stock, then try a set of pilot jets one size larger.
Yup filters oiled , turned air screw in and no diffrence, I am gonna try backing it out and see if that helps. I replaced the old chewed up pilots with new stock sized ones , I wil try the larger pilots if the other things dont work.
thanks agian
The problem is that the stock boxes are made to work with the jetting so i was just wanting to verify the unis are in fact the issue. If you turn the air screws out you will LEAN the circuit and make the surge worse, however if you turn the screws in to about 1/4 to 1/2 turn from fully shut and it gets better when you ride it is a safe enough assumption you can go up on the pilots to richen the circuit.
If this is the case id try a .5 increase first, so if you have in .35 now id get some .40 jets to try.
The air screws can compensate some but you want them to be in around the 1 to 1 1/2turns out setting when youre finished.
Guys, he problem with surging is that it is not always LEAN. Rich causes the same effect in some cases, which is why it is good to test in both directions. If it screwing the air screws a long way out makes it worse, then it confirms lean. If it gets better, then it's rich.
The suggestion to try the air screws was intended as a diagnostic tool. Allan is right that you want to end up 1.25 to 1.5 turns out.
That said, air screws all the way in suggests that something is not right in the pilot circuit. One turn in is usually about equivalent to a jet size. That almost sounds like there's still a partial blockage in teh pilot system.
But let's try the screw turned out a long way first and see what that does.
