Cant find carb rack for xj700, will other do?

Hi


I am new to XJ's and would nt normally ask silly questions such as this but I recently bought an 85 XJ700 Maxim and the poor thing is having carb problems.

I returned the airbox and filter to stock from the Pods it had previously and now i find the mixture screws are rounded so i dont know how they will be balanced now.

I am having trouble finding another Xj700 carb rack though and wanted to know if i can use HItachi carbs from other models.

cheers

 

I believe a rack from an XJ750 should work. A rack from an XJ650 would work as well, but you would most likely have to replace the jets with yours out of the 700 rack. Chacal carries all kinds of parts for Xj carbs as well. Great guy to deal with and really fair prices. cruzerjd

 

This is most assuredly NOT a silly question.

I'm not so certain -- the service manual off the XJCD shows the 85 XJ700 uses Hitachi 33s, while the 82 XJ750 has Hitachi 32s. Then again, they might work -- we need to get Chacal in here to straighten this out. He might even have the mixture screws.

 

Thank you guys, I appreciate your help.

Chacal is brilliant, he is chatting with me on replacement carbs for my XJ.

thanks again.

 

Michael.....I can't honestly answer whether the XJ650/750 Hitachi (HSC32) carbs will work correctly on your model. I think they WILL, as they are the same basic carb bodies, but the HSC33 model carbs had some refinements, bowl vents and such are the very visible differences, and I don't know enough about the internal passages to comment on.

As to physical shape, size, throat and air horn spacing, etc. they are the same, so the physical interchange isn't an issue. The slide pistons carry a different factory part number between the -32 and -33 series, but all the ones I've looked at measured seem to be identical, so I don't know what the difference is there.

You may have to do a bit of jet tuning to get the earlier HSC-32 series carbs to work correctly on your bke. It MAY be possible to just use the 700-sized jets in the earlier carbs, or it may require different size jets to get it to perform correctly (by different size, I'm not talking about physical size---that's the same----I'm talking about the fuel and air passage size). The -33 carbs don't have air compensator jets in the air horn, for example; I don't know how that's going to affect tuning.

Tuning a set of carbs via switching jets/needles around is a very time-consuming and frustrating proposition.

This is one of the reasons why I've recommended that you stick with what you have, and rebuild/replace your carbs with another set designed for a 700 model rather than go on the "experimental warpath".

I would also try to find someone who knows a bit more about these carbs than the fellow who you are currently employing to this task, as I'm not sure that he's the right guy for the job. I know that's a tall order, especially at the stage of the process that you're already at, but that's my 2-cents-----if the job is done wrong (for whatever reasons), then you'll be both out of $ and still have carb issues.

Good luck, let me know if I can be of any other help to you.

 

Thank you for your help with all this.

cheers

 

Any one know how this ended... I might be in a similar-ish situation with my XJ750J (see http://xjbikes.com/Forums/viewtopic/p=79977.html#79977).

I'm thinking that I could use XJ650 carbs on the 750, while swapping i all the right jets, etc. Because the 650 and 750 share carb body models, I'm feeling a little comforted.

 

Blufish---yes, you're is a straight swap. Only differences are all the jets (air and fuel, pilot and main---4 total) and the needles. Everything else remains the same.

 

Speaking of air jets........

Who carries those little monsters?