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TOPIC: Re:Rebuilding my engine; some questions
#1339
Victor (User)
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Rebuilding my engine; some questions 6 Years, 4 Months ago Karma: 0  
Hello All-
My 1983 XR1000 has over 35,000 miles (56,000 km) on it and I started taking it apart a few years ago.

I have aquired many parts for the rebuild including:
-Black Widow Cams
-Vision Grinding Alum/Steel cylinders w/ 10.5 pistons
-Barnett Scorpion Clutch

I plan to run stock carbs and I have 4 different exhaust systems:
-Stock
-Stock with rear baffles removed (bike came that way from dealer back in '83.
-Supertrapp 2:2
-Supertrapp 2:1

I also plan to replace the stock rocker boxes and shafts with the late model ones (I hate the ends of the stock shafts snapping off)

I spoke with some of people who know these engines and they pointed out that the early 83 XRs were prone to case cracks around the crankshaft pinion brg. I don't know of any one who can repair that if it is indeed cracked.

Dual plugs is the recommended practice for the Hi comp pistons, but I don't know if this is 100% necessary.
Are there any combination of ignition systems and sparkplugs that will eliminate detonation?

Gotta go back to work.
 
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#1340
61xlch (User)
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Re:Rebuilding my engine; some questions 6 Years, 4 Months ago Karma: 0  
Hi

I am running BlackWidow Cams, 10.5 pistons, stock carbs and stock ignition and modified stock exhaust. No dual plugging.
No problems so far, but not ridden a lot.
I use 100...102 octane fuel!

Best
A....
 
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Last Edit: 2012/05/05 22:12 By 61xlch.
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#1341
RGT (User)
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Re:Rebuilding my engine; some questions 6 Years, 4 Months ago Karma: 0  
my understanding is that dual plugging is more important on stock iron heads with high compression due to the high cumbustion chamber and tall piston needed to get high compression impeding the flame front and/or causing pinging. The XR's with their shallower chamber and flatter high compression pistion should not be as prone to those problems. Sounds like you have some nice parts lined up, I like the low weight aluminum cylinders.

If you find you need case welding a good place to try is at a local small airport.

Curious about what specific rocker covers and arms you would use to replace the stock items? and how much modification is involved?

Thanks,
Roger

Good luck with it
 
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Last Edit: 2012/05/06 08:54 By RGT. Reason: more questions
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#1353
Victor (User)
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Re:Rebuilding my engine; some questions 6 Years, 4 Months ago Karma: 0  
Bill the XRNUT posted this here a year ago or so:
"Those Shafts are Very hard to find. Did yours break where the the lock nut goes on ? Harley changed the shaft to a bigger DIA. where it comes through the rocker box as this was happening quite frequently. You would be able to use the same rocker arms but you would need 4 shafts and a set of the new boxe's
The boxes are 17514-88RA and 17515-88RA and are approx. $160 ea US dollars. The shaft number is 17430-95R and you would need 4. They are all the same, intake or exhaust. They are Approx. $65.00 ea US Dollars
If you ride your XR this is a great upgrade. I am using these myself on a engine I am building.
Bill/ The XRNUT"


You can type "rocker" in the search box on this site to see the full thread.

Cheers
 
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#1354
Tom (Admin)
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Re:Rebuilding my engine; some questions 6 Years, 4 Months ago Karma: 0  
QUOTE:
The boxes are 17514-88RA and 17515-88RA and are approx. $160 ea US dollars.


You may save some $$ if you can find somebody with a milling machine. Just show him the boxes, the old and new shafts and ask how much it will cost to increase the holes to fit with the new shafts.
Increasing the bore diameter in an aluminum housing is a relatively easy task for a mechanic equipped with a milling machine.

And if he fail's you still can buy new boxes...
 
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#1355
RGT (User)
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Re:Rebuilding my engine; some questions 6 Years, 4 Months ago Karma: 0  
There have been few things I had to part with that I always miss, my big cnc Bridgeport and my 10" Atlas lathe. I am hoping at my next posting that I can find some shop that will allow me access for money or my time....
Thanks for the information, 22 more days until I can get my hands on my new toy....
 
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