Author Topic: Having a hard time finding idle jets. (Read 1324 times)

robdrobd · « **on:** August 31, 2011, 05:44:29 AM »

I have been scouring the Internet for new pilot jets for my 76 750k and can't find them anywhere. I would like a #45, but would settle for a #42.5 for now. Anybody have and inside on where to get these things. Already checked siriusinc with no luck.

ekpent · « **Reply #1 on:** August 31, 2011, 05:47:12 AM »

Got a friend looking also so will be watching----

MRieck · « **Reply #2 on:** August 31, 2011, 05:52:56 AM »

Did you try Sudco?

Bo24 · « **Reply #3 on:** August 31, 2011, 01:48:43 PM »

You can try www.JETSRUS.com

Coyote13 · « **Reply #4 on:** August 31, 2011, 01:51:06 PM »

Try siriusconinc? They tend to have some hard to find items

nccb · « **Reply #5 on:** August 31, 2011, 05:58:48 PM »

have you checked out cb750cafe.com? IDK if these are the right size you said but he has an assortment if you look through his parts list. Hope this might help.

nccb · « **Reply #6 on:** August 31, 2011, 06:02:25 PM »

nevermind i just see the 40s. try emailing him, i heard he is good about answering, he might know where to get some

robdrobd · « **Reply #7 on:** August 31, 2011, 06:11:40 PM »

Jetsrus has them. Should I go 42's or 45's?

robdrobd · « **Reply #8 on:** August 31, 2011, 06:23:23 PM »

I am guessing the 45's is the way to go. I upped the mains from 105 to 120. I figure the idles can jump up two?

ABikeNamedTrouble · « **Reply #9 on:** August 31, 2011, 06:58:03 PM »

Advice from my own headache-causing experience: order lots of different sizes. With jetsrus.com, you can return the unopened ones. The thing is, you'll never know exactly what size you need until you experiment, as every bike is different.

robdrobd · « **Reply #10 on:** August 31, 2011, 07:01:20 PM »

Good point, I'll just get both sets

Iron Spade Cycles · « **Reply #11 on:** August 31, 2011, 08:40:13 PM »

General rule of thumb is primaries go up one size for every 3 sizes of mains. Its a pretty good rule that works most of the time. I agree, these things are getting much harder to find.

Later Travis

c(b)hris · « **Reply #12 on:** August 31, 2011, 09:42:14 PM »

i think i found mine from this guy
http://www.northcityvintagehonda.com/servlet/StoreFront

i just called the number on the site and told him what i needed. he looked around and called me back.

dtmmil · « **Reply #13 on:** September 01, 2011, 02:54:32 AM »

I have always heard that on those carbs a jump on the pilot is not necessary. The guys I heard it from run open pipes and open intakes, and run 120-125 jets without changing pilots.

robdrobd · « **Reply #14 on:** September 01, 2011, 12:32:12 PM »

If they are racing the bikes I could see no change because the bike runs well with any kind of throttle, but I need to do a mime or so of stop and go before I hit the open road and need a better lower rpm performance

dtmmil · « **Reply #15 on:** September 01, 2011, 06:39:16 PM »

Have you tried adjusting the air screws to help, turn them in just a little with decrease air in, and richen up the pilot side.

robdrobd · « **Reply #16 on:** September 01, 2011, 06:50:12 PM »

Will a bike buck/skip if it's too rich? Air screws are nearly seated. I will back them out this weekend and keep going in a quarter turn until something changes. Hopefully for the better.

dtmmil · « **Reply #17 on:** September 02, 2011, 08:28:14 AM »

"Tip: It would not hurt to carry a screwdriver with you and ride around roads where you would be stopping and cruising slowly, and as much as possible in 5th gear so you are spending as much riding time using the low end circuit. Pay attention to how the bike sounds as you slowly pull away from a stop. If it stutters a little or balks a bit back the screw out 1/8 turn and test again. If it pulls away fine but has a stubborn idle turn the screw in 1/8 turn and test again. You may have to just nudge the screw to find that sweet spot but in no time the bike will lope at idle yet pull away from a stop smoothly. A vacuum sync before hand is strongly recommended."

I borrowed this from an old dog! haha Maybe it will help
http://www.hondachopper.com/garage/carb_info/plug_chops/plug_chops.html
this is his also, maybe this will help too.

grasscutter · « **Reply #18 on:** September 02, 2011, 06:45:28 PM »

Quote from: ABikeNamedTrouble on August 31, 2011, 06:58:03 PM

Advice from my own headache-causing experience: order lots of different sizes. With jetsrus.com, you can return the unopened ones. The thing is, you'll never know exactly what size you need until you experiment, as every bike is different.

+1. Many folks think an increase in main jet automatically means an increase in idle jets, pilot jets. Not true. Mains are usually 1/4 throttle through WOT. Fuel needs are not changed dramatically @ idle (unless you've done some major engine build, blue-printing, head work, etc.)

**Coming from an old vintage snowmobile racer: If wanting to really dial in the 'off the line jump', it will take a nice smooth transition from pilot to main. But wait, that all depends on what RPM you dump the clutch. OK, Ok.. I'll stop. To much information.

News:

Author Topic: Having a hard time finding idle jets. (Read 1324 times)