Topic: Slow jets, + Different floats ok or no go?

[nixon]

I got a used set of  K4 round top for my auto..its now got 110 main but i forgot to check slow.

 It did have 130 main prev- used on big bore engine i think, so maybe slow bigger than 40.

what problems would too large a slow jet be? it seems to idle ok..but stutters quite a lot at stead throttle. under acceleration feels ok

The bike has 25k miles, no engine work except k4 cam, breadbox filter, more open exhaust

Also noticed the 2 inner floats are metal, outter plastic, is that ok?  Was about to buy kits, with or without bowls, happy to pay the $ if may fix issue!

[drumstyx]

Floats shouldn't be a problem, but you'll have to measure the fuel level rather than float height, since at least 2 of them are the 'wrong' ones. You should do that anyway though of course.

[nixon]

appreciate the input..will need to investigate what that means..not sure how to do either.. if setting float height is easier with 4 the same..ill just get ne ones.

i have minimal experience with carbs, if thats not obvious hehe

[flybox1]

Measuring the fuel level =  Clear tube test.

http://forums.sohc4.net/index.php?topic=149299.0

[evanphi]

He's got roundtops so they won't look like that photo.

Here ya go:

The bottom of the meniscus sits right at 3mm for all the carbs. I measured them all off the same carb so they're as equal as they're ever gonna get! They all had to come up about 2mm.




Pro tip: If you want to raise the float height without removing the float (and losing your needle) each time, you can reach in there and give the tang a pinch (to lower it) with some long-nose needle pliers. If you need to lower your fuel level, raise the tang up with a flat screwdriver. The hose for mine is made with an old drain plug that I cut the head off, and jammed onto a piece of 1/8" fuel line.

[evinrude7]

i imagine that you have to keep the petcock open when doing the clear tube test, correct?  the amount of fuel that fills the clear tube would essentially lower the amount in the bowl if the petcock was closed.

[nixon]

thanks so much! makes more sense now..

[drumstyx]

i imagine that you have to keep the petcock open when doing the clear tube test, correct?  the amount of fuel that fills the clear tube would essentially lower the amount in the bowl if the petcock was closed.

Correct. Also don't make the column of fuel shorter once its extended -- you'll be feeding the fuel back into the bowl making the level high.

[jonda500]

i imagine that you have to keep the petcock open when doing the clear tube test, correct?  the amount of fuel that fills the clear tube would essentially lower the amount in the bowl if the petcock was closed.

Correct. Also don't make the column of fuel shorter once its extended -- you'll be feeding the fuel back into the bowl making the level high.

+1 this is vital if you want an accurate reading - tape or tie the clear tube securely to the side of the float bowl before turning the fuel on
John