Max turns out on Pilot Screw??

I have a 1980 KZ750E1 that I brought up to about 3500 feet from sea level and put Pod filters on. The mids and highs seem close since it was richer bringing it up to 3500', but the 0-1/4 throttle seems lean and is giving me trouble. I am at 3-1/2 turns out on the pilot screw to try and richen it up. Can I turn out more? What is the max? The stock #62 primary main would not affect this area would it? Maybe I need to go to like a #68 or something?

Aaron

Did it run ok before installing the pods? Ed

What I've always heard is that more than 3-3.5 turns out, you should jump up to the next size pilot and turn the screws back in to ~1 turn out and go from there.

Later, Doug

AaronOregon wrote: I have a 1980 KZ750E1 that I brought up to about 3500 feet from sea level and put Pod filters on. The mids and highs seem close since it was richer bringing it up to 3500', but the 0-1/4 throttle seems lean and is giving me trouble. I am at 3-1/2 turns out on the pilot screw to try and richen it up. Can I turn out more? What is the max? The stock #62 primary main would not affect this area would it? Maybe I need to go to like a #68 or something?
Aaron

Existing pilot jets would be expected to produce a richer mixture at higher elevation (because thinner air means less air).

Installing pods would be expected to produce a leaner mixture (by adding more air), but should be offset by richer mixture attributable to a higher elevation.

With CV style carbs, it's particularly difficult to achieve a perfect air/fuel mixture throughout the entire range of throttle. Although some after-market suppliers do claim their carb kits produce excellent performance throughout the entire carb range. But we've somehow been spared from an onslaught of success stories.

0-1/4 throttle seems lean...am at 3-1/2 turns out on the pilot screw to try and richen it up. Can I turn out more? What is the max? The stock #62 primary main would not affect this area would it? Maybe I need to go to like a #68 or something? --
A larger pilot jet might help, but would first assure the existing jet and pilot circuit are perfectly clean , and that the pilot screw o'rings are in good condition.

If the pilot jet receives fuel through a tiny lateral passageway, would assure the passage is perfectly open and clean, and that the plugs are in position.



Good Fortune!

Existing pilot jets would be expected to produce a richer mixture at higher elevation (because thinner air means less air).

Installing pods would be expected to produce a leaner mixture (by adding more air), but should be offset by richer mixture attributable to a higher elevation.

With CV style carbs, it's particularly difficult to achieve a perfect air/fuel mixture throughout the entire range of throttle. Although some after-market suppliers do claim their carb kits produce excellent performance throughout the entire carb range. But we've somehow been spared from an onslaught of success stories.

0-1/4 throttle seems lean...am at 3-1/2 turns out on the pilot screw to try and richen it up. Can I turn out more? What is the max? The stock #62 primary main would not affect this area would it? Maybe I need to go to like a #68 or something? --
A larger pilot jet might help, but would first assure the existing jet and pilot circuit are perfectly clean , and that the pilot screw o'rings are in good condition.

If the pilot jet receives fuel through a tiny lateral passageway, would assure the passage is perfectly open and clean, and that the plugs are in position.

Good Fortune!

How would I go about cleaning those inside passages that fuel flows across? I soaked the carbs in carb cleaner and have blown air/carb cleaner through every hole I can find on them. Also, I think I have #35 pilot jets and cannot find anyone that sells these. Anybody have any or know of any? I bought the bike stock and made it a bobber. It wasn't running when I bought it with the stock airbox on it, but want the look of the the pods. Thanks guys!

Aaron

Patton wrote: ... If the pilot jet receives fuel through a tiny lateral passageway, would assure the passage is perfectly open and clean, and that the plugs are in position....

AaronOregon wrote: ... How would I go about cleaning those inside passages that fuel flows across? I soaked the carbs in carb cleaner and have blown air/carb cleaner through every hole I can find on them....

When you say "Am thinking pilot jet plug" do you think they are leaking past the seal? When I pulled those plugs out to unscrew the pilot jets, I noticed the seals were pretty flattened out but they sealed pretty tight. Are they actual o-rings and are that squashed or are they made flatter like that?

Also, the "Fuel to starter jet" how do you clean this? Is this the one that looks like it has a little pin in it?

Thanks much for all the help BTW.........

Aaron

StreetfighterKz wrote: What I've always heard is that more than 3-3.5 turns out, you should jump up to the next size pilot and turn the screws back in to ~1 turn out and go from there.

Later, Doug

+1

The mixture screw only affects idle. If you are properly turning the mixture screw to set the idle and it is 3.5 turns out, then you need a bigger pilot. Since you have gone to pods you will need a bigger main and either shim the existing needle or find an adjustable replacement that will work for you.