Search found 14 matches

by CBDCL
Fri Oct 30, 2015 12:10 am
Forum: Technical Discussion
Topic: Replacing 81 CB650 Carbs with 82 CB650SC Nighthawk Carbs
Replies: 10
Views: 2045

Re: Replacing 81 CB650 Carbs with 82 CB650SC Nighthawk Carbs

@cb650 thank you for all your help! Update: I successfully cleaned and rejet the 82 CB650SC carbs with 120s and installed on my 81 CB650 Std. I even ground the pilot screw 'stops' down as @cb650 noted so I may adjust them on the fly. She vacuum sync'd perfectly today. Aside from conditioning complic...
by CBDCL
Mon Oct 19, 2015 4:15 am
Forum: Technical Discussion
Topic: Replacing 81 CB650 Carbs with 82 CB650SC Nighthawk Carbs
Replies: 10
Views: 2045

Re: Replacing 81 CB650 Carbs with 82 CB650SC Nighthawk Carbs

Very much unremovable. They're pure evil. :roll: I've had them on my bench 3x trying to clean through the slows and the 90° angle that follow them, without success. I could not get water to run through them consistently. I'm all for working with what I have, but finding an inexpensive 82 rack was pr...
by CBDCL
Sat Oct 17, 2015 10:35 am
Forum: Technical Discussion
Topic: Replacing 81 CB650 Carbs with 82 CB650SC Nighthawk Carbs
Replies: 10
Views: 2045

Re: Replacing 81 CB650 Carbs with 82 CB650SC Nighthawk Carbs

Great point @cb650 thanks! I'm in NYC so aprox 30 FAS.
by CBDCL
Fri Oct 16, 2015 6:05 pm
Forum: Technical Discussion
Topic: Replacing 81 CB650 Carbs with 82 CB650SC Nighthawk Carbs
Replies: 10
Views: 2045

Re: Replacing 81 CB650 Carbs with 82 CB650SC Nighthawk Carbs

Thanks @cb650 for the quick response! Factory jets on the standard are 120 and 118 on the SC. Would you mind educating me as to why I should size up? Thanks!
by CBDCL
Fri Oct 16, 2015 1:27 pm
Forum: Technical Discussion
Topic: Replacing 81 CB650 Carbs with 82 CB650SC Nighthawk Carbs
Replies: 10
Views: 2045

Replacing 81 CB650 Carbs with 82 CB650SC Nighthawk Carbs

To diminish the hell that is 81's pressed slow jet anti-mod carbs, I've chosen to replace with the emission fearless 82s. I found a rack off of an 82 CB650SC Nighthawk thinking they were exact. For the most part, they are, however research shows the main jets are a size down smaller! 81-82 CB650 - #...
by CBDCL
Mon Oct 12, 2015 4:09 pm
Forum: Technical Discussion
Topic: Putting an early 70s CB750 tank on my '81 650
Replies: 13
Views: 2549

Re: Putting an early 70s CB750 tank on my '81 650

Hocus82 and folks, I'm so sorry for not updating. It was very generous to put in findings for me. I ended up keeping my original tank. Oddly enough, the teardrop tank actually looked great with my bratstyle build, so I kept it. I haven't seen many bikes like this work with this build so had to run w...
by CBDCL
Fri Aug 28, 2015 8:26 pm
Forum: Technical Discussion
Topic: 1981 CB650 Pilot Screws Adjustments
Replies: 1
Views: 16438

1981 CB650 Pilot Screws Adjustments

Carbs on this model can be a headache. You already have pressed recessed slow jets making cleaning hell. So perhaps anything helps us unfortunate carb owners. Most of my trouble was in finding answers online, so I thought it would be nice to contribute pilot adjustments to help perfect your mixtures...
by CBDCL
Wed Aug 05, 2015 7:31 am
Forum: Technical Discussion
Topic: Erratic stuttering, 1sec leak-out hiss noise, no idle...
Replies: 2
Views: 1153

Re: Erratic stuttering, 1sec leak-out hiss noise, no idle...

Did you check the valves? I was having some engine troubles and just readjusted mine after 4000k. Seems to start up and run a lot smoother now. I'm pretty new as well and the hiss sound means nothing to me. If you go through everything and set it all up correctly then it should work well though, ri...
by CBDCL
Tue Jul 28, 2015 10:06 pm
Forum: Technical Discussion
Topic: Erratic stuttering, 1sec leak-out hiss noise, no idle...
Replies: 2
Views: 1153

Erratic stuttering, 1sec leak-out hiss noise, no idle...

My 1981 CB650 is still acting up, boggling some of the best wrenchers I've met. I didn't get any help on my last outdated post so I deleted it. I have fixed some probs but unfortunately have more odd problems. She is still down for the count. Here are the probs, starting with the strangest... - In 1...
by CBDCL
Fri Jun 05, 2015 7:55 pm
Forum: Technical Discussion
Topic: Delayed acceleration (getting whiplash)
Replies: 2
Views: 1077

Delayed acceleration (getting whiplash)

Hi! I have a 1981 CB650 with 8k miles (yeah, no typo) It has a big delay in acceleration. At first, from stop, it feels like it's missing power when accelerating, then vroom! Here's some bullet points: • In any gear, when I accelerate, the RPMs rise a bit, but after about 2 seconds of acceleration, ...
by CBDCL
Sun Apr 12, 2015 10:31 am
Forum: Technical Discussion
Topic: Putting an early 70s CB750 tank on my '81 650
Replies: 13
Views: 2549

Re: Putting an early 70s CB750 tank on my '81 650

"CB650", can you clarify? Thanks!
by CBDCL
Sun Apr 12, 2015 10:25 am
Forum: Technical Discussion
Topic: Putting an early 70s CB750 tank on my '81 650
Replies: 13
Views: 2549

Re: Putting an early 70s CB750 tank on my '81 650

Thank you so much for testing this! I too like that it's short and stubby. It will play well with how I'm simplifying the 3tree and my flat seat can move up a bit, not hanging over the rear wheel as much. It appears to be a success and thanks again! You mentioned either create the spacer for the mou...
by CBDCL
Sun Apr 12, 2015 12:30 am
Forum: Technical Discussion
Topic: Putting an early 70s CB750 tank on my '81 650
Replies: 13
Views: 2549

Re: Putting an early 70s CB750 tank on my '81 650

hocus82, that's very generous! Thank you very much!
by CBDCL
Sat Apr 11, 2015 9:13 pm
Forum: Technical Discussion
Topic: Putting an early 70s CB750 tank on my '81 650
Replies: 13
Views: 2549

Putting an early 70s CB750 tank on my '81 650

I'd like replace the tank on my '81 CB650 with an older CB750 tank, '71-'76. Should be a 73/74. I've asked and they don't know the year or style. http://pages.ebay.com/link/?nav=item.view&alt=web&id=171675491734 I'm thinking it's a K. Anyone know if it will fit? I'm comfortable with modifyin...

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