1982 Seca XJ750, ZRX1200 has company now.

[Bonz]

Disregard the need for air jets. I found a box of parts that got put under a shelf in the garage in the hustle and bustle of unloading the bike from the trailer. Multiple spare carb bodies in the box, pulled the air jets and they are in carb cleaner soaking.

[Bonz]

The carbs are off, apart and cleaned. The hack at the dealership that cleaned the carbs for my uncle 15 years ago did a poor job. My uncle said it never ran like the one he had bought new when he was a lot younger. Anyway, below explains why, IMO...

Need some confirmation/help with a jetting question and request for parts guys that read this thread may have gathering cobwebs.

The Hitachi carbs call for 120 mains, 40 pilots on the fuel side. Good to go on all 4 with what the carbs have in them, and have 118 and 116 mains along with 38 pilots to play with from JetsRus. My elevation is 7200'.

On the air jet side under the diaphragm, calls for 220 main air jets and 80 pilot air jets. One carb had a 195 air jet and another had a 50 pilot air jet. Scarcer than hens teeth to find Hitachi air jets. JoeRDMCguy has a set of the same carbs from an XJ650 and is sending me the 210 main air jets and 70 pilot air jets. Very kind of him!

Hopefully that sets the scene for what I am working with.

My plan is to put 210 main air jets and 70 pilot air jets in the middle cylinders. Keeping the main fuel and pilot fuel jets the same (dropping down one or two sizes on mains, one on pilots for elevation). As air jets do the opposite of mains, the smaller they are, the richer the mixture, which would richen up the middle cylinders. Seems like a workable solution to run the middles slightly richer even though stock was the same across all 4 carbs.

Given the pilot and main air jets are at work at lower throttle openings to help with fuel atomization before airflow picks up, the fuel mains will work the same for mid range and above with little or no influence from the air jets.

What does the collective have to say about the above? Anything I am missing with respect to the overall plan?

Next, if someone has a single 220 Hitachi main air jet and an 80 pilot air jet, I would like to hear from you and work out getting those. I'd rather get the air jets all the same and use the fuel main and pilots for tuning in the best case scenario.

[Bonz]

Thanks fellas, looking forward to getting out on the road! Hope you all are well.

[JeffH]

Nice to get a Yama back in your garage.
That is a beautiful machine. As Mike said, keep us updated on progress.
Hopefully you have time to get it on those Colorado roads before the snow builds up (too much) in the twisty areas west of you.

Jeff

[Socer4m]

Bonz, Hope it fits your xxl frame,,,it should be a fun fast scoot for around the area,,,also hoping we get a Colo. rally next year, Keep us informed on the seca progression. I had a number of xs750 and xj750 maxims....quick, fun up to around 75, but hard to beat the smoothness of the 1100 after that........cya, Mike in San DIego and PA

[Bonz]

Rebuilt from the frame up 15 yrs ago by my uncle, 322 miles after he finished it, sat since then. He used NOS parts to replace parts that weren't "perfect" in his words. Carbs are now off, full unrack and clean. Front brakes next, then it'll be a looker and a runner. He has a 2010 Gen 2 VMax, 2015 CB1100 and a Road Glide as well as a 1977 Trans Am he took down to the therefore the Seca didn't get much riding time. Lots of similarities to the XS in general with respect to maintenance, how parts come off, etc.