Tim's SR500

Re: Tim's SR500 - Nov 11 2010 - first small bump in the road / possible detour

Er, ah,
If it hasn't fallen apart in your hands, I don't think it's a crack. A lot of dirt track spools were / are built out of 3 pieces - the "barrel" if you will and the flanges for the spokes. The separate pieces were designed and machined to have an interference fit. Depending on the manufacturer, the barrel was chilled (frozen) and the flanges were warmed up. A couple hundred degrees difference really moved the dimensions around and the 3 pieces were pressed together in a hydraulic press. Depending on the manufacturer, the parts may have been slathered with a permanent bonding agent as well, just before assembly.
Sounds odd I know. But I've never heard of one coming apart.
Check the other hub flange and see if you see the same thing - I'd like to know. We had that bike going pretty good the last time we rode it and I think one of us would have noticed the "odd" handling as a result of a hub coming apart - there's quite a side load on a dirt tracker pitched into a corner and if there was a problem, it should have shown up.
I do have another spool hub but don't know if it can be used with a disc.
The other alternative already mentioned is the 40 hole street bike hub - I think the Honda 750's and some Kawasakis had them. The spoke flange is a bit larger diameter than your dirt track hub, but the spoke angle difference is probably so modest, you could use your 19 inch rim okay. Check the spoke guages as well - I think the dirt track spokes are a gauge larger. All this stuff can be addressed - it just takes a little thought and time.
Let me know what you find on the other flange, but looking at the photo, I'm pretty sure its a 3 piece hub. I'll check around and get back to you.
Regards,
Pat Cowan.
 
Re: Tim's SR500 - Nov 11 2010 - first small bump in the road / possible detour

That there is some freaky-deaky shit. Now I'll admit, when I saw the 'crack' I was amazed that (a) it wasn't running through the spoke holes themselves, which I presumed would be the weak point and (b) that it was perfectly uniform, completely around the hub and through the entire flange.

The other flange (pics to come) doesn't show any sign of a seam. Looks like it was machined out of a single piece. But I'm no expert - will snap some pics - let me know what you find on your end! Hoping it is all good.
 
Re: Tim's SR500 - Nov 11 2010 - first small bump in the road / possible detour

Bit of progress tonight - pics later.

After staring at the bike and making mental notes of which brackets I need etc. I decided WTF am I doing staring at this thing and I took it apart.

Engine out, wiring out, front end mostly off (left the lower tree and forks to keep the bike upright), blah blah blah. Will knock it out later tonight probably.

Then I need to get buddy Paul from Back Alley Moto to teach me welding and we'll throw a loop on the frame and cut off all the extra bits I don't need or want. Then it's blasting and color time!

I didn't know the oil in frame meant most of the bloody frame! I assumed it was just the big top tube, but no, in fact the whole front down tube is full of oil too. Kinda wondered how the oil circulated. When I undid the little innocent looking 10mm bolt in the lower front downtube (I thought maybe it was there for an accessory or mount from another country's model or something) nice fresh looking oil shot out.

Started wiping down the engine - paint looks like new. The engine mounting bolts all look new. This thing only has 5000 miles on it and has been sitting well protected for 20 years - it's in very very nice shape under the dirt. No rust anywhere yet.

Almost a shame to do what I'm about to do to it ;)
 
Re: Tim's SR500 - Nov 11 2010 - first small bump in the road / possible detour

Tim said:
Bit of progress tonight - pics later.

After staring at the bike and making mental notes of which brackets I need etc. I decided WTF am I doing staring at this thing and I took it apart.

Engine out, wiring out, front end mostly off (left the lower tree and forks to keep the bike upright), blah blah blah. Will knock it out later tonight probably.

Then I need to get buddy Paul from Back Alley Moto to teach me welding and we'll throw a loop on the frame and cut off all the extra bits I don't need or want. Then it's blasting and color time!

I didn't know the oil in frame meant most of the bloody frame! I assumed it was just the big top tube, but no, in fact the whole front down tube is full of oil too. Kinda wondered how the oil circulated. When I undid the little innocent looking 10mm bolt in the lower front downtube (I thought maybe it was there for an accessory or mount from another country's model or something) nice fresh looking oil shot out.

Started wiping down the engine - paint looks like new. The engine mounting bolts all look new. This thing only has 5000 miles on it and has been sitting well protected for 20 years - it's in very very nice shape under the dirt. No rust anywhere yet.

Almost a shame to do what I'm about to do to it ;)
Click to expand...

See?.. what did I tell ya??!!.. just put it on and ride the shit out of it... ;D
 
Re: Tim's SR500 - Nov 11 2010 - first small bump in the road / possible detour

Here are pics of the opposite flange - no sign of being separate pieces, but the rotor side sure does look like it was made this way, but just not fit together perfectly. The whole flange is stepped 'in' almost 1mm.

Very odd, but it sure does look like it was made this way. Would be interested in seeing the other spool hub you have regardless.

IMG_3836.jpg

IMG_3835.jpg

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Re: Tim's SR500 - Nov 11 2010 - first small bump in the road / possible detour

ITS GRINDIN TIME!

The frame is bare so time to cut the crap off. Maybe I'll put my grinding to music as I cut into this pristine SR500 frame :)
 
Re: Tim's SR500 - Nov 11 2010 - first small bump in the road / possible detour

Tim said:
ITS GRINDIN TIME!

The frame is bare so time to cut the crap off. Maybe I'll put my grinding to music as I cut into this pristine SR500 frame :)
Click to expand...

What would that be?.. Handle's Messiah?.. Or Pachabel's Canon in D again?
 
Re: Tim's SR500 - Nov 11 2010 - first small bump in the road / possible detour

Tim,
Your hub was made in 2 parts and not 3 like I first surmised (there were 3 piece hubs as well).
The 2 piece hub allowed easier manufacturing and greater marketing flexibility - be able to sell spool hubs and hubs with a disc brake attachment by using the same body and changing one flange (the left side flange was always the same). Back then, not that many disc brake mounts were sold. "Historically", there is at least one other street bike running around with similar wheels to yours...
My other front wheel has a spool hub with no provision to mount a carrier and disc. I was going to run a perimeter brake disc and a small caliper, but the only supplier I could find for perimeter discs wanted around $1600.00 just for the disc...
If you're reluctant to run the flanged spool you have, try the 40 hole Honda front hub - and get a speedo drive at the same time. Check the spoke gauge - there might be some light hub machining to do.
Interesting comments on wheels on this post. I always thought the whole idea of the street tracker look was to bring the minimalism, agressiveness and toughness of a dirt tracker to the street, with as few changes as possible to make your bike street legal and of course usable (at least to a certain degree).
IMHO, a bike with a dirt track seat and 18 / 17 / 16 inch wheels isn't a street tracker - it's a street bike with an aftermarket seat. I've seen some outstanding custom bikes over the years that purport to be street trackers, but...are they?
I'll pop you some photos of my spool hub wheel.
Pat Cowan,
Vintage Motorcycle Fiberglass
Pacomotorstuff
 
Re: Tim's SR500 - Nov 11 2010 - first small bump in the road / possible detour

To anyone comtemplating putting 40 spoke 19's on their SR project, the most adaptable front hub may be the Kawasaki Z1 hub - 40 spokes but has a 17mm axle (according to a axle chart on the web) - the same size as the SR - while the CB750 is 15mm. You still have to figure out wheel spacers though...
Hope this helps.
Pat
 
Re: Tim's SR500 - Nov 11 2010 - first small bump in the road / possible detour

Current state of the bike - grinding starts in earnest tomorrow :D

IMG_20101111_185449.jpg
 
Re: Tim's SR500 - Nov 12 2010 - hack and slash time!

Grinding is well underway - almost done. Cleaning up some with flapper wheels and might hand-sand some to smooth some grinding marks out.

I think I left all the important brackets in place ;) Ready for a new rear frame loop, bit more cleanup and then off to the powdercoaters or paint - still deciding on colors.

I plan on running passenger pegs on this bike - it's getting a 2-up capable seat, so it should have pegs :) and the right peg mount serves as the stop for the brake pedal too. If I welded and had lots of material kicking around I'd probably re-do them, but they're ok the way they are. I took the peg mounts off 'cause they were an abomination, and different on each side. So I'll get a section of tube welded in place for footpeg mounting purposes.

IMG_3846.jpg

IMG_3845.jpg

IMG_3843.jpg

IMG_3841.jpg

IMG_3838.jpg
 
Re: Tim's SR500 - Nov 12 2010 - I love the smell of metal filings in the morning!

Nice Tim! Good work! A few pounds of metal shaved away there.
 
Re: Tim's SR500 - Nov 12 2010 - I love the smell of metal filings in the morning!

The passenger peg brackets remain? ???
 
Re: Tim's SR500 - Nov 12 2010 - I love the smell of metal filings in the morning!

Yeah, he did mention keeping it two up.
 
Re: Tim's SR500 - Nov 12 2010 - I love the smell of metal filings in the morning!

My fault - should better read before write, sorry!

Nevertheless, why not grind them off and just fix
passenger pegs to the swingarm (e.g. at lower
shock mounts or rear axle) only when needed
to keep the bike as clean as possible?

Best regards
Sven
 
Re: Tim's SR500 - Nov 12 2010 - I love the smell of metal filings in the morning!

You know, its funny you mention that right now. I recently picked up a 400f and found this;
ea16b093.jpg

is this safe, really? I had never seen it before.

Minor jack, Tim, sorry
 
Re: Tim's SR500 - Nov 12 2010 - I love the smell of metal filings in the morning!

Trust me, doing the CB400F thing crossed my mind a while back (if you're ever buying a CB400F make sure you're getting the model with the swingarm-mounted pegs and rearset front pegs / exposed chrome gas cap - worth more).

The right side passenger peg mount also serves as the brake stop for the rear brake pedal. They're not as ugly as many rear peg mounts, so I don't mind keeping them.

You never know when some cute girl will need a ride ;)
 
Re: Tim's SR500 - Nov 12 2010 - I love the smell of metal filings in the morning!

The pegs don't detract from the look IMO. Now less talking, more chopping.... :-\ :mad:
 
Re: Tim's SR500 - Nov 12 2010 - I love the smell of metal filings in the morning!

So that is stock on this bike, hmmm. All I got was a rolling chassis and motor no tank or side covers etc.
 
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