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Old October 7th, 2013, 08:32 PM   #1
newdodge
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Angry wanted help with honda cb750 carbs

i have a 81' 750K,sat for 9y i got it running but it would "bog" down every time you got gave it any throttle. It doesn't do it as bad when it's in full choke but still it doesn't have a smooth acceleration of RPM's. I cleaned them last week and pulled the carbs and all the jets, gaskets and needles, cleaned up the bowls and floats and then re-assembled and yet there is still a problem. I'm not that great with carbs so... Anyway, rode it down the road again today and it still has bogging issues. It seems to happen more when under a load. I can manipulate the throttle a little and eventually she'll get up to speed, but it takes a while and it's not fun in traffic :-) So that's my issue, any ideas??? i may pay someone to fix them ok 734-770-6493
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Old October 7th, 2013, 08:38 PM   #2
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If it's not as bad in full choke then that means it is not getting enough fuel. Recheck you main jets and pilot jets. Look up the factory adjustment spec for all metering screws. Also having someone synchronize the carburetors can help a lot! It sounds like more than a sync issue though.
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Old October 7th, 2013, 08:49 PM   #3
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Originally Posted by kixx007 View Post
If it's not as bad in full choke then that means it is not getting enough fuel. Recheck you main jets and pilot jets. Look up the factory adjustment spec for all metering screws. Also having someone synchronize the carburetors can help a lot! It sounds like more than a sync issue though.
X2..If it runs on choke, it sounds like plugged pilot jets and not getting fuel at low RPM's..If you haven't done it yet, clean the tank, lines,install fresh gas
and fuel filter.
also check the air intake system for mice debris or cracked intake boots. Not sure if the 750 does but some carbs have small filter screen in the fuel inlet before the float valve, check to make sure if its clean
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Old October 7th, 2013, 08:49 PM   #4
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I when thru the Jets twice already it idols ok 1-4 carburetors are poppin sputtering and missing sometimes I have put my hands over them to wake them up
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Old October 7th, 2013, 08:51 PM   #5
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X2..If it runs on choke, it sounds like plugged pilot jets and not getting fuel at low RPM's..If you haven't done it yet, clean the tank, lines,install fresh gas
and fuel filter.
also check the air intake system for mice debris or cracked intake boots.
new tank an fuel lines intake boots an gas
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Old October 7th, 2013, 09:00 PM   #6
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did you make sure the jets were clean, run a torch tip cleaner through them? is there a fuel screen before the float valve? sometimes you have to unscrew the float valve and they are behind the needle seat assembly.
If it wakes up with hand over carb it means it has a lean condition, no fuel or carbs adjusting way wrong.
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Old October 7th, 2013, 09:06 PM   #7
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I will try that out tomorrow
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Old October 7th, 2013, 09:06 PM   #8
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there may also be a fuel screen in the fuel petcock. After a quick search I didn't find any screens behind the needle valve, just in the petcock. do a quick google search.
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Old October 7th, 2013, 09:15 PM   #9
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Ok
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Old October 7th, 2013, 09:40 PM   #10
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That bike may have CV carbs on it. The diaphragms on the slides can crack and not allow the slides to work correctly. I'm not sure when they started using CV carbs on those bikes though.
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Old October 9th, 2013, 11:28 AM   #11
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Okay I've done all the tests everybody's told me everything is working properly but now since I took apart for the 4th time Cylinder one in cylinder for now our stock so I fired the bike up to go straight to 6000 rpm I'm done messing with the Carpenters somebody on here that knows how to fix an Tune carburetors and sinkem please send me a PM with your phone number I need these done I have cash
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Old October 10th, 2013, 03:04 PM   #12
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Still lookioking
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Old October 12th, 2013, 05:38 PM   #13
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Still need someone ASAP
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Old October 13th, 2013, 03:37 PM   #14
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I can do them.
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Old October 13th, 2013, 03:38 PM   #15
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If they're the same as my buddies cb carb anyways
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Old October 13th, 2013, 04:08 PM   #16
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I have cv carbs that run on VAC
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