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I have a 750 that I recently bought for $200.00. It had been in storage for 16 years and I'm trying to clean the carbs. The slides seem to be stuck. This model has a bar across the bank with lifters that attach to the tops of the round carb. The bar wouldn't move, either it was stuck or all the slides are stuck in the down position. Would someone know if I need to punch the bar out to remove the lifters or just take the big nut off the top of the carb. They were all synched and have yellow paint on the nuts showing they were sealed after being calibrated. Any help and advice would certainly be appreciated. Sam
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Sam -
Before trying to disassemble them, you should try to get them unstuck. Soak them in lots of Marvel Mystery Oil or WD40 for a few days, trying to operate them each day. Removing the return spring will help you out some, as this is a very heavy spring and makes the carbs very hard to operate even in working condition. After a few days of soaking, a heat gun will help to loosen parts up also.
Can you feel if the slides have any movement (back and forth or up and down) at all?
There are always working sets selling on Ebay for less than $100 if you can't get these working.
Good luck -
750 carbs
Thanks Gnepig for the help. I've been slow proceeding because I never want to go too fast in the wrong direction. I also asked for help on a honda forum and a fellow suggested removing the big nut from the top and the two screws holding the carb from the rack and trying one at a time. Once I get it where I can unscrew the top cover I should be able to see if the slide is stuck. The problem was that the bar that operates the levers connected to all four didn't seem to move so I didn't know if the bar was stuck or the slides. I had thought about tapping the bar out releaseing lifters but I was hesitant because I might not get it back correctly. I'll try one carb at a time and see. I will attach a picture showing what they look like, different from xs11. Thanks for the help...Sam Sorry, told I couldn't post a picture. I wonder why.SamComment
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I know what your carbs look like, I have a 74 CB 750 also. All i can say is lots of penetrating lube and patience. I'm going to bet that it's the pivot bar that's stuck.
Incase you get tired of messing with yours:
http://cgi.ebay.com/ebaymotors/Parts...1%7C240%3A1318Comment
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750 carbs
Thanks again Gnepig,
I didn't know what that bar was called but pivot sounds right. The carbs should be fine once I get in them. The bike only has 7000 miles on it. The one owner put it up in 92 and sold it to me a couple of months ago. It was in a storage shed without a door so there is a lot of rust on the metal covers and handlebars, luggage rack, kick starter, rear brake. I'm using electrolysis to clean them up and it's working great. If I can figure out how to get a picture posted I'll show the before and after. The honda has steel where the Yamaha's had aluminum on the covers. Could you tell me what the tubes are for that go out the bottom of the carbs. Are they for an overflow in case the floats get stuck? Just wondering. Good talking to you.....SamSamComment
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"Could you tell me what the tubes are for that go out the bottom of the carbs. Are they for an overflow in case the floats get stuck? Just wondering."
Yes, they are also a vent so make sure they are open. Be extra careful with the tubes on the inside of the bowls, they are very fragile and are easy to brake off.
This is my 750-4:
To put photos here, you have to sign up with http://photobucket.com/ (it's free) or a carrier like that and load your photos with them. Then you click on the 4th yellow line below the picture (IMG code), then right click and paste here, in the block where you type your response. Viola! pictures
Good luckComment
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75 750 carbs
Hi Gnepig,
That's a nice one. How does it ride and how fast will it go? Thanks for showing me how to load the pictures.
SamComment
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