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Author Topic: 2150cc Evo Custom Updates  (Read 8166 times)

Offline crazypj

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Re: 2150cc Evo Custom Updates
« Reply #50 on: Apr 29, 2018, 00:17:23 »
Although I haven't worked on a softtail for about 10 yrs, the under-brace isn't actually brace but to reduce stress at the connection of arm and upright due to the shocks being underneath tranny and connected to bottom of your 'T'
It acts more like a pull rod
 You'll have to remove all the bolts to anodize it, unless you already have titanium ones? (anodizing doesn't like stainless)
« Last Edit: Apr 29, 2018, 00:22:35 by crazypj »
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline Bevelheadmhr

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Re: 2150cc Evo Custom Updates
« Reply #51 on: Apr 29, 2018, 16:38:41 »
Yep the under braces work in extension not compression, I have a couple of ideas for making them a bit different from just a welded in bar. The countersunk bolts are all stainless, but its no trouble to remove them if needed to get the arm anodised or powder coated, now its been welded together.

Offline Bevelheadmhr

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Re: 2150cc Evo Custom Updates
« Reply #52 on: May 19, 2018, 12:38:40 »
Had an interesting morning, weighing the XL1250 and a near standard XL883 yesterday, using the calibrated scales built into the brake testing machine used for the annual test with have here in the UK.

Wasn't sure how accurate the method would be, as it tests one wheel at a time, but the numbers we got from the near standard bike were close to its official weight (485lbs for a 1991 XL883).

The XL1250 would be lighter of course, but how much? It weighed in at 400 lbs with only a little fuel in the tank. Not bad at all. Still hasn't been set up on the dyno due to lack of time, but it sounds ok being run up and down the road..  here it is if you want to hear it..




Offline Bevelheadmhr

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Re: 2150cc Evo Custom Updates
« Reply #53 on: Jun 15, 2018, 17:57:10 »
My mates XL1250 finally had its first run on the dyno today. Its running way too rich, and with standard cams and rejetted OE carb, we weren't expecting huge power numbers. Although it was built for low end torque over top end HP in any case.

Despite running rich, it made decent power, with a smooth graph, no sudden dips in HP as the revs climbed. With leaner jetting should make more a bit more HP.

What did it make?  You'll have to watch it running on the dyno to find out .. 
    :)

Offline Bevelheadmhr

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Re: 2150cc Evo Custom Updates
« Reply #54 on: Sep 26, 2018, 16:37:11 »
Finally got around to working on the alloy swingarm again. It needed two underbraces to replicate those of the original steel arm. But that proved to be difficult as alloy bar cant be so easily bent and manipulated as steel. So after a couple of false starts, I came up with a final design. I bought 1m of 30mm alloy bar, cut it in half, then line drilled them (had to use a friends 1940's Capstan lathe, as ours isn't big enough. I left the last few inches of one end solid. This would be the lower end which was machined down to a 20mm flat, so it could be welded to the lower part of the side plates of the arm. The other hollow end was profiled on the miller to fit the underside of the two arms. That done, just had to take it to Geoff the welder who welded them into place.

Pity I forgot about the need for a bracket on one brace to hold the brake torque arm, but it'll be added when I get time.

Next task is to make a wheel spindle, not sure yet what to use.. EN24 or Stainless steel.. Ti would be light, but I hear its banned from being used in race bikes for good reason, so probably best to stick with steel. Also need to make a battery box for the lithium battery its getting, which should save about 12lbs over a lead acid equivalent... still need to buy a suitable one of those. Then finally have to decide on the finish.. either polish it or polish it and have it ceramically coated.

Total weight of the arm is 17lbs with the temporary thread bar 'spindle'.. about half of the original steel version.

Offline crazypj

  • Posts: 13488
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Re: 2150cc Evo Custom Updates
« Reply #55 on: Sep 27, 2018, 01:52:41 »
You should anodize it  ;)
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0