Author Topic: best final drive for 650 in a 550 with 550 hub (free pictures inside) (Read 7152 times)

hellraiserDLX · « **on:** March 21, 2015, 03:33:49 PM »

i dont know the factory specs on the 650 besides the front sprocket. Any input on what i should run for close to factory or decent setup for occasional freeway rides? Plus im planning on offset sprockets if you have any input on that as well haha thanks in advance for any help guys.

hellraiserDLX · « **Reply #1 on:** March 21, 2015, 03:34:57 PM »

Pic for attention

Retro Rocket · « **Reply #2 on:** March 21, 2015, 04:01:59 PM »

Quote from: calj737 on March 21, 2015, 03:54:05 PM

Why do you need offset sprockets?

Good question...?

hellraiserDLX · « **Reply #3 on:** March 21, 2015, 04:17:26 PM »

3.5 x 18 rear rim laced to the factory 550 hub with a 140 tire

Retro Rocket · « **Reply #4 on:** March 21, 2015, 04:55:05 PM »

Quote from: hellraiserDLX on March 21, 2015, 04:17:26 PM

3.5 x 18 rear rim laced to the factory 550 hub with a 140 tire

Shouldn't need offset sprockets for that unless the chain line for the 550 is significantly smaller than the 750...?...

hellraiserDLX · « **Reply #5 on:** March 21, 2015, 05:08:51 PM »

Its a 650 engine. Its my understanding that the 650s run 530 chains so the front sprocket i have is a 530. Other than that i believe its the same as a 550. everything i have from the nice gentlemen on here is the widest you can got on a stock 550 setup is a 130? Correct me if im wrong. This is a whole new territory for me hence why im asking all these questions

hellraiserDLX · « **Reply #6 on:** March 21, 2015, 05:47:45 PM »

Ill have to try and mock it up when i reassemble my wheel next week. I dont know the proper final drive of a 650. I think i can source the proper sprockets just kinda curious what the best ratio would be for me.

bwaller · « **Reply #7 on:** March 21, 2015, 05:57:32 PM »

Use a straight edge to check sprocket alignment with any sprocket on the rear. Sprocket Specialists can make one for the 550 rear hub. A 79 CB650 used a 40T, the 550's were 37T.

hellraiserDLX · « **Reply #8 on:** March 21, 2015, 06:11:52 PM »

Quote from: bwaller on March 21, 2015, 05:57:32 PM

Use a straight edge to check sprocket alignment with any sprocket on the rear. Sprocket Specialists can make one for the 550 rear hub. A 79 CB650 used a 40T, the 550's were 37T.

i will definitely check for alignment. I figured i would have to get something from them. The engine is out of an 82 nighthawk. Dont know if they ran something different than the earlier 650s. Not a ton of info on them like our traditional 550/750 bikes. Thanks for the info!

FunJimmy · « **Reply #9 on:** March 21, 2015, 06:30:08 PM »

Quote from: hellraiserDLX on March 21, 2015, 04:17:26 PM

3.5 x 18 rear rim laced to the factory 550 hub with a 140 tire

I didn't need anything special with a 130 tire on mine and a 140 shouldn't be a issue either.

hellraiserDLX · « **Reply #10 on:** March 21, 2015, 07:26:23 PM »

Quote from: FunJimmy on March 21, 2015, 06:30:08 PM

Quote from: hellraiserDLX on March 21, 2015, 04:17:26 PM
3.5 x 18 rear rim laced to the factory 550 hub with a 140 tire

I didn't need anything special with a 130 tire on mine and a 140 shouldn't be a issue either.

nice. That sounds like extra money in my pocket. The bill on this build is getting pretty rediculous...

FunJimmy · « **Reply #11 on:** March 21, 2015, 09:32:04 PM »

Quote from: hellraiserDLX on March 21, 2015, 07:26:23 PM

That sounds like extra money in my pocket. The bill on this build is getting pretty rediculous...

That's what you say, but we wouldn't have any idea cause there's no fricken build thread.

hellraiserDLX · « **Reply #12 on:** March 21, 2015, 10:04:20 PM »

I know i know i know...im sorry. I wanted to but i seriously buckled down and did 85% of the work in a day...i feel kinda bad about it haha

FunJimmy · « **Reply #13 on:** March 21, 2015, 10:28:06 PM »

Quote from: hellraiserDLX on March 21, 2015, 10:04:20 PM

I seriously buckled down and did 85% of the work in a day...i feel kinda bad about it haha

You're my hero!

hellraiserDLX · « **Reply #14 on:** March 21, 2015, 11:15:30 PM »

oh no! Dont give me that much Credit. Im still a rookie for sure. I learned so muxh from this page and random #$%* on the web its not even funny. I just want to hear this exhaust setup haha. I need to get it started. Working on wiring tomorrow. Ill try and fire it and post a video. No promises though

bwaller · « **Reply #15 on:** March 22, 2015, 05:57:06 AM »

Oh this won't do. I suggest you pull it apart and take a proper amount of time to build your bike. Perhaps a year or so with pictures & questions and maybe ask about which oil to use.

Yeah....that would be more like it.

OK good luck with the start up.

Scott S · « **Reply #16 on:** March 22, 2015, 01:36:55 PM »

I did a lot of research on this when I swapped a 650 into my CB500. Played with gearing calculators, tire size dimensions, gear ratios in the transmission, etc.
I ended up with a 17/40 combo and it worked very well. Plenty of punch and normal revs on the interstate.

hellraiserDLX · « **Reply #17 on:** March 22, 2015, 02:45:54 PM »

I was waiting for you to chime in Scott. Where did you source your 40t rear from? Sprocketspecialists? You running 530 or 520?

SOHC4 Cafe Racer Fan · « **Reply #18 on:** March 22, 2015, 04:20:41 PM »

Quote from: bwaller on March 22, 2015, 05:57:06 AM

Oh this won't do. I suggest you pull it apart and take a proper amount of time to build your bike. Perhaps a year or so with pictures & questions and maybe ask about which oil to use. Yeah....that would be more like it.

OK good luck with the start up.

Hahahahaha

Scott S · « **Reply #19 on:** March 23, 2015, 06:55:07 PM »

Quote from: hellraiserDLX on March 22, 2015, 02:45:54 PM

I was waiting for you to chime in Scott. Where did you source your 40t rear from? Sprocketspecialists? You running 530 or 520?

I found it on ebay. I used the stock 550 pitch chain.

seanbarney41 · « **Reply #20 on:** March 23, 2015, 07:41:41 PM »

Hellraiser...I love that paint! Please tell me you are keeping it.

hellraiserDLX · « **Reply #21 on:** March 24, 2015, 06:29:46 AM »

Quote from: seanbarney41 on March 23, 2015, 07:41:41 PM

Hellraiser...I love that paint! Please tell me you are keeping it.

its staying that way for the riding season While i source a new set ov side covers and a decent tank to have painted. This setup will stay just how it is forever

seanbarney41 · « **Reply #22 on:** March 24, 2015, 04:12:14 PM »

Quote from: hellraiserDLX on March 24, 2015, 06:29:46 AM

Quote from: seanbarney41 on March 23, 2015, 07:41:41 PM
Hellraiser...I love that paint! Please tell me you are keeping it.
its staying that way for the riding season While i source a new set ov side covers and a decent tank to have painted. This setup will stay just how it is forever

good to know

MiGhost · « **Reply #23 on:** March 26, 2015, 02:07:05 AM »

Just to clarify it. The 82 650 nighthawk ran 17/38 gearing with the 130 tire. I changed my 80 650 Custom over to it. It gives a good well rounded ratio. The 18 wheel will help a bit on the cruise rpm end.

hellraiserDLX · « **Reply #24 on:** March 26, 2015, 07:07:17 AM »

Thanks for that info! Makes sourcing a rear sprocket a lot easier as long as the factory setup will clear the tire

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Author Topic: best final drive for 650 in a 550 with 550 hub (free pictures inside) (Read 7152 times)