So I got roped into helping another friend with a top end on their twin cam. This is a 05 Electra glide but carb not FI. He bought a new Mikuni 42 to got with the 95” top end instead of the stock CV carb. Although I’m not sold it’s an authentic Mikuni as it came in a white unmarked box and not paperwork of any kind. Seems a little blah for s big company like Mikuni.
I pulled the bottom jet out and it’s 160? Other two jets in the kit say 155 and 170. What is this measurement as it’s different then S&S. Is this a good starting point for this? I have no experience with a Mikuni and just need him running good for break in then hell dyno it.
the sizes are metric. put a decimal point after the first number,, then multiply the number by .03937,,, and you will have the equivalent size in American measurements..
mikuni sends a ton of paperwork and instructions for tuning.
Assuming that P is a 0 and the phone keypad didn’t change to numbers fast enough to keep up with your brain terry that would give these 160 jets a conversion of about .063 correct.
That good for a 95” 10:1 kB pistons and S&S 510s?
I figured Mikuni would at least provide a printed box or some kind of paperwork. I’m really thinking he got a knockoff and wonder if he knows it. Any tell tale signs by looking st it to tell?
how much did he pay for it? that'll be the determining factor....that carb if it's a real Mikuni should run over $300 and you're correct if it was real it would be in an identifiable box with a crap ton of paperwork.
Depends of it was sold in a kit with other parts
When converting metric I always take the metric number and divide by 25.4 either method works but when I am going through thousands of blue prints with thousands of dimensions it's quicker to punch in a calculator [emoji41]
Jake that was correct the p is really a 0,,, like nitram said division is also a formula to convert to us measurement,,, I do the calculations in my head,, and my head prefers multiplication,,,
Thanks guys. I talked to him last night and he said he bought it direct from the Mikuni website and it came in a bigger box with Mikuni on it. So it should be legit.
Are there any starting point adjustments to apply? Not a lot of tuning videos out there compared to s&s where they say mixture screw 1.5 turns out to start etc.
Got it all back together and ran a couple heat cycles. Took it out for a ride and between that Mikuni and the dynatek TC88 ignition he bought I’ve got some tuning to do. Sputter in the midrange and doesn’t like to idle below 1200 rpm
Tech tip of the day. The rubber intake gaskets work way better when not put on backwards.
Fml.
30 seconds and a can of carb cleaner to find the problem air leak. Two hours and a drained gas tank that was freshly topped off to fix it. There’s a reason people get paid to do this for a living and I don’t haha
Right. And it’s clear as day how it should be yet I still managed to F it up. I knew everything was going way to smoothly. All good now. Isles around 1k good throttle response and no pinging. Might need to adjust accelerator pump has a slight hesitation off idle. But I’m learning this Mikuni as I go haha
Don't feel bad, I was tired one late night working on my bike doing something I did thousands of times on many bikes and managed to assemble wrong. I friggen assembled the push rod covers wrong, I couldn't understand why I struggled with them so much. Next morning switched them around, thank God for adjustable.push rods or it would have really pissed me off.
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