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General Category >> Rubber Side Down! >> 240 rear build
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Message started by Buttsy on 05/02/20 at 03:37:19

Title: 240 rear build
Post by Buttsy on 05/02/20 at 03:37:19

Very early stages of my savage with Harley 240 rear. GSXR front end build

http://https://i.postimg.cc/Lqd7MtXH/20200502-094511.jpg (https://postimg.cc/Lqd7MtXH)

http://https://i.postimg.cc/wyJ29Z1M/20200502-094540.jpg (https://postimg.cc/wyJ29Z1M)

http://https://i.postimg.cc/GBNzwYjc/20200502-094615.jpg (https://postimg.cc/GBNzwYjc)

Title: Re: 240 rear build
Post by Gary_in_NJ on 05/02/20 at 04:57:23

Nice! Did you build the swing arm?

Title: Re: 240 rear build
Post by srinath on 05/02/20 at 08:17:17

Ooooo What tank ? One of em ebay CG125 ones ?
Did you have to mod the frame or something to not let the FE hit the tank ?
What GSXR ? Looks like 96-2000 750 from my memory LOL.

Cool.
Srinath.

Title: Re: 240 rear build
Post by Buttsy on 05/02/20 at 10:36:35

The swingarm was done for me. Widened to suit wheel and had it extended by 100mm. The tank is my old savage tank that im now using as a mock up tank. I initially filled the hole where the speedo was but managed to get a brand new tank for £70 so using that instead and leaving the speedo where it is, but no mods to the frame apart from where the seat is. And its a K1 750 gsxr front with custom yokes with increased depth to push the forks and wheel out a bit further.

Title: Re: 240 rear build
Post by Gary_in_NJ on 05/02/20 at 10:52:19

So what’s the plan for lining up the rear pulley to the counter-shaft pulley? What is that wheel from?

Title: Re: 240 rear build
Post by Dennisgb on 05/02/20 at 17:21:02

I wonder if the 650 will be able to turn that big fat tire >:(

Title: Re: 240 rear build
Post by Buttsy on 05/02/20 at 22:51:09

The wheel, axle, pulley and caliper is from a 2018 FLFBS Harley Fatboy that was written off. I paid appx £650 for the parts and to have the swingarm altered and powder coated.
Apparently I have options with the front pulley. I can either get the stock pulley for the harley fatboy and have a spacer and shaft made to suit, or have a custom pulley made that fits the stock shaft and wide enough to line up with the rear pulley. That will be decided by the gentleman who'll be making whatever he thinks works best. My tiny little brain isnt equipped for the clever jobs!!
I wondered about the 650 not having enough power to move the tyre but do have the mikuni roundslide carb and will be following the advice here on getting a few extra bhp with that and the ufo etc so hoping its enough, but im happy riding slow as my other bike (intruder M800) has all the power i need for everyday riding. I know putting a 240 on has been done before, so time will tell and i'll keep you posted.
Its taken me a year just to get to this point as its being done as and when i can afford to do it and is more hassle than the worth of it but i'll try and give an idea of what its all cost at the end.....incase in the very unlikely event that someone else wants to do it. Lol.

Title: Re: 240 rear build
Post by srinath on 05/03/20 at 07:02:41

The stock savage rear wheel aint no light weight.
A HD solid wheel - likely still heavier - but if you end up with a bike that's 100 lb lighter which is easy IMHO the extra rotational energy wont be a big deal.
Cool.
Srinath.

Title: Re: 240 rear build
Post by Gary_in_NJ on 05/03/20 at 10:19:13

Srinath, it is far easier for the engine to propel 100 pounds (like a heavy rider) than it is to accelerate rotational mass (I’m not going to break out my physics books to prove it). That rear wheel assembly probably weighs double what a stock real wheel assembly weighs. It will make a significant impact on performance. Buttsy has indicated that’s he’s happy to make that trade, but there’s no even exchange here.

Title: Re: 240 rear build
Post by Buttsy on 05/03/20 at 11:25:03

All input is not just welcome its very much needed and will be taken on board. This is just a bit of fun and a distraction and will probably be a very impractical and slightly uncomfortable ride that i'll only use for the odd few hours on a sunny sunday afternoon.....and we dont get too many of those here in Wales, so performance and handling (providing its safe of course) is definitely not at the top of the list.

Next job, extend the shock mounts.

Title: Re: 240 rear build
Post by Gary_in_NJ on 05/03/20 at 11:42:00

Yeah, I’m not trying to rain on the parade here. This bike looks like it will be a blast to ride and be seen on. Just don’t race for titles on it (maybe a Monkey bike). I love your vision for this build.

Title: Re: 240 rear build
Post by srinath on 05/03/20 at 12:56:14

202A2E242F26222B757377470 wrote:

That's why they have lower gears and those disc rear wheels - I've seen people drill big holes in them - though balancing turns out to be a problem if they don't do it right.

Cool.
Srinath.

Title: Re: 240 rear build
Post by Buttsy on 05/03/20 at 12:58:50

I love these forums theyre great and the members are always helpful with such impressive knowledge of bikes and engineering in general, so im just grateful to be part of it. I'll keep posting as I progress and thank you for taking the time to comment and share, its much appreciated.

Title: Re: 240 rear build
Post by DieselBob on 05/03/20 at 13:35:00

How much offset will be required on the drive pulley to align with the rear pulley? I don't know the specifics on the output shaft and accompanying bearings of a Savage. But, I sometimes worry about the forces applied with excessive overhang on a shaft. Especially given the tension required on a belt drive.

To our resident Savage gurus, is the output shaft up to the task.

Title: Re: 240 rear build
Post by Buttsy on 05/04/20 at 01:34:18

Surprisingly the offset isnt as big as you may think. From the centre of the tyre to the outside of the rear pulley is appx 130mm on the savage and appx 165mm on the harley. The pulleys on the savage are almost 20mm wider than the harley ones.

After just picking up the savage wheel which is still whole, brake hub, axle etc theres not that much of a weight difference either. I'll get hold of a weighing scale to get a more accurate reading.