Topic: noob question about 180 tire and a swingarm that will fit 76 frame.

[caldurham]

The forum search is playing up due to a change of server, the mods are onto it..

that is good to know. i thought for sure it was on my end.

No more pics, i am going to go down as one of the slowest builders on here {maybe Jerry will beat me} I have been collecting parts for nearly 10 years, started out with one old 750 drag bike and now i have 3 but all are in parts, one 1000cc one 970ccc and a 900cc, one is an F0-1 a K2 and a K4 k2 hybrid, 2 of them are very expensive to build so its slow going, i have just moved into a house with a huge garage {shed} so things may speed up a bit now....

man i understand. my time is limited but i hope at least i can have a roller for my 76 by the end of the year. that would be nice and that is my goal. hoping i can have her together and running by next summer. i been looking at some of the threads in the project sub forums and thought about putting mine there ... but i think it'll take so long people won't care to look lol! i'm more of a lurker anyways unless i need some information.

also i'm already looking for a 3rd bike so that may slow me down some too. i had 3 a few years ago but i sold the 2 ninjas i had. i just got bored with them but now i kind of regret it. and i really have a passion for older bikes as well. motorcycles can become an affliction if you have the two wheel fever.

1000cc 750 ..... i would love to see that finished.

[Retro Rocket]

1000cc 750 ..... i would love to see that finished.

Thats number one on the finish list, billet block, nikasil bores, highercomp forged pistons, ported head with all the gear, back cut gearbox, better clutch, RS34 mikuni carbs, then eventually fuel injection, RC crank, and piles more, you can see why its taking so long...
All up i have had over 20 CB750's and around 20 other different road bikes up to GSXR1100's, even an GPX750 {ninja} superbike.... I just love 2 wheels, didn't get my car license till i was 40...

[FrankenFrankenstuff]

OK, well I have had a similar project in the works for a few years now. Please see all of my errors and dead end engineering. My bike is a 76 550F with a 180 rear and....the whole idea of just putting an offset sprocket in front and milling the wheel sprocket is not a real option. Where I am right now the sprocket needs to come out from the stock position an inch. An INCH! That is alot of extra load.
The cyclex offset sprocket only buys you some 1/2" or so to play with, and the stock rear sprocket is typically running the chain pretty close to begin with. The only real way to get it to work is to modify your frame to buy some space and the area to modify has alot of important geometry that cant....bla bla bla You will need a bearing to support the extra side load bla bla bla...



I have seen others bring this same subject up before. Everyone usually tells me what I am doing wrong and how it can easily be done, but as far as I have seen...my bike is the only one actually with the motor and rear wheel. I want to give you some honest advice. Put the bike back together stock and make it shiny. Sell it and use the money to buy and old Ninja. Done.

[FrankenFrankenstuff]

http://forums.sohc4.net/index.php?topic=70436.msg782070#msg782070








Also please not the fact that my thread is now a frigging ZOMBIE.

[Stev-o]

Buy an old Ninja?

[FrankenFrankenstuff]

What? Yeah. He can just clean up and put together a nice shiny 35 year old Honda and sell it for $1600, then buy some POS 90's Ninja and molest and cut. I was trying to give an honest bit of advice......one of which I would not ever follow. OK frig it. My plan for fitting the 180 into the 550 is to have the frame bumped out in the chain/swingarm pivot area and then just machine a REAL offset front sprocket and have a bearing support to brace the bit O load that will now be introduced. DONE. It seems he has the guts at this point and anything that any of us armchair engineers have for advice will be tested and either fail or.......work. Good luck dude. I am in the same boat.


boat? Ninja boat? sweeeeet

[Retro Rocket]

.the whole idea of just putting an offset sprocket in front and milling the wheel sprocket is not a real option.

There's a bit more room on the 750 Joe, the slick on the 4.5 inch rim in my picture is a 180, i had plenty of meat on the Suzuki sprocket carrier to mill off and using a K7-8 output shaft it will line up perfectly without a 10mm offset sprocket. the chain is very close to the tire but it clears, anyway i am going to run a 160 on an 18inch rim so no trouble...

[caldurham]

.the whole idea of just putting an offset sprocket in front and milling the wheel sprocket is not a real option.

There's a bit more room on the 750 Joe, the slick on the 4.5 inch rim in my picture is a 180, i had plenty of meat on the Suzuki sprocket carrier to mill off and using a K7-8 output shaft it will line up perfectly without a 10mm offset sprocket. the chain is very close to the tire but it clears, anyway i am going to run a 160 on an 18inch rim so no trouble...

yeah i wouldn't have even bothered asking the questions i did if i would have known it couldn't be done. but i've been lurking a while tring to research the information i need to fit a 180. i've seen more than a few 750's on here with 180 tires hanging of their backends; cbr500's crotch bobber project bike (btw THAT bike is amazing!) being a good example and the same year frame as me. though he did make himself a custom swingarm. and really my only concern at this point is what swingarm to use but i think i am good there too now, so no worries.

1000cc 750 ..... i would love to see that finished.

Thats number one on the finish list, billet block, nikasil bores, highercomp forged pistons, ported head with all the gear, back cut gearbox, better clutch, RS34 mikuni carbs, then eventually fuel injection, RC crank, and piles more, you can see why its taking so long...
All up i have had over 20 CB750's and around 20 other different road bikes up to GSXR1100's, even an GPX750 {ninja} superbike.... I just love 2 wheels, didn't get my car license till i was 40...

that ................. is gonna be sick! my goal next year, if i can get my 750 running for the summer time, is to rebuild my sportster engine. the goal being 120hp at the rear wheel. i know it can be done, it's just gonna be $$$, parts and time.

[FrankenFrankenstuff]

OK OK. So anyway. More pics and less talky talky. Again. This subject has been raised several times and I am yet to see it get pulled off. (ie - running and riding bike)

[caldurham]

OK OK. So anyway. More pics and less talky talky. Again. This subject has been raised several times and I am yet to see it get pulled off. (ie - running and riding bike)

here's cbr500's project. he's running a 180/55-17 on a 76 750 frame. i'll be running the same size tire as well.
http://forums.sohc4.net/index.php?topic=65268.0

also bigsherm's Bugsy 78 project bike had a 180/55/18 (!!!) on it but if you read the project thread he went down to a 170/60/18. http://forums.sohc4.net/index.php?topic=60806.0

there are a few others i've seen but those 2 come to my mind quickest and are very nice looking bikes and they are definitely running.

back to lurking mode!

[FrankenFrankenstuff]

MAN! Both 750. Dang. OK. carry on. carry on. (you were right RR)

[SoyBoySigh]

I don't understand the chrome paisley thing on the right side of the swinger. If I stretch my brain a bit, I can grab a hold of the see-through sections of the swinger itself, but the paisley thing has be scratching my head when I ought to be scratching my balls.

-S.

[george]

Exactly what I want to do to my K8 , just $$ , garage space and parts are holding me back. I have one of Carpy's Dresda copys that should work, it needs wider bushings inside at the axle and some mods at the frame to fit the K8. Also I have (had) a K5 with the early GS1100 swingarm which looked pretty good.(crappy picture) My plan is to use the Dresda copy with a 75 F hub laced to a 5" x 17 wheel and adapt the rear disk , I just don't have all the parts, only the hub, the rim and labor from Buchanans is pretty steep. So I'll go on the cheap with the drum brake for now, and lace a 4.5"or 5" wheel to my stock hub. My bike really needs some meat in the back to fill up the fender(Witchey Creations) even with the 140/70/17 on there now. Those e-bay shocks are a bit taller than stock and stiffer than a sailor on a 3 day leave , so they will probably be changed to something shorter, I like the lowered look of a 750 right on the tire.