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Post by therrin on Sept 2, 2008 2:20:18 GMT -5
Yup! and that's the exact page out of my Mikuni carb and parts manual...
currently I'm "missing" 28 and 36. (the main jet and the air jet)
However, this shows the pilot jet (21) as slotted, and mine isn't.
So I can't even get the pilot jet out to see what it is, and I can't find the main and air jets that I lost (total fail happened right there)
At this point I'd like to try to replace the main jet with something, and the air jet with something, and see if I can figure out how to get a good run off this carby.
The problem I was having is that in just about any gear, I could get about maybe 1/4 turn out of the throttle before it would just wanna bog down and die out.
From what I could tell when I pulled the main jet I *think* it was a 320. And the needle is set to the 3rd slot down. But I can't get the pilot out to see what it is. =(
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Post by therrin on Sept 2, 2008 2:22:26 GMT -5
So if it would work "okay" in the first part of the throttle, maybe my pilot is okay. But I think having the needle clip down that far is part of the problem, and then the main jet from there.
The air jet I only pulled cuz I wanted to see what it was, then I lost the d**n thing. (%*&$&#!)
Oh, and I only *think* its a smoothbore. How can I tell?
The only numbers I can find on it read as:
36
127
I'm guessing the 36 is 36mm, but I dont know what the 127 means.
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Post by StewRoss on Sept 2, 2008 3:29:59 GMT -5
If it's the same as that one then it's not a smoothbore...don't think that Mic made a smoothbore in 36mm anyway, most were smaller, 26mm, 28mm...in the Japanese carbs, Kei Hin continue to make smoothbores in smaller and larger sizes than 36mm. A smoothbore round slide carby has a very thin slide that moves over a central core, with the carby bore through the centre of the core...the needle is usually suspended from the very top of the slide which is hollow and closed over at the top. When looking from the rear, the carby bore appears to have a tube straight through with no cutouts for the sides of the slide as on a standard Mic. Hence the name 'smoothbore'. The air jet in the inlet of your carby has a fairly large effect on the carburetion generally and you would have been better to leave that one in-situ. As you have no real way of telling what was there, although it's probable that it was the one the carb came with, I'd try a 'BS30/97 2.0', as that seems to be the one the carbs come with as standard. You have to start somewhere. Not sure what has happened to the pilot jet...someone may possibly have butchered it... The book you refer to lists the standard 36mm MJ as a 310. The number on the carby body is probably an application number... As for jetting there are numerous posts here on that topic. Try this recent one for a start: sr500forum.proboards38.com/index.cgi?board=Fuel&action=display&thread=2291Good luck with it. SR  |
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Post by therrin on Sept 3, 2008 2:44:00 GMT -5
Hey thanks!
Yeah I've already read over all the threads I could find on this forum about it.
In doing so I realized that understanding carbs and tuning them is pretty much voodoo and black magic. And the people who've mastered it and learned the secret have ascended to a higher level.
And they aren't just gonna give up the secret.
Apparently there's alot of trial and error involved as part of the process.
=P
Thanks for the advice.
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Post by therrin on Sept 11, 2008 14:31:22 GMT -5
Okay one more question.
How do I get the butchered pilot jet out? Drill? *cringes* Tap in something sharp and try to screw it out? What's the best way?
They didn't make any of those that were press fit did they?
I'd like to pull it since it appears to be cracked.
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Post by therrin on Sept 12, 2008 0:53:54 GMT -5
Ahhh update!
Apparently there USED to be a slot...but it got rounded off, and the crack is most likely the result of someone trying to hard.
Soooo.... I attacked it with a reverse thread drill bit and out it came. To demolished to see what it was though. <shrugs> I'll just try a couple different sizes and see if I can find something that works reasonably well.
I've seen you guys post on here all the way from #25 to #47.... hmm... Maybe I'll try somewhere in the middle and work from there.
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Post by StewRoss on Sept 14, 2008 6:03:48 GMT -5
Try starting at a 30...and go from there. SR  |
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