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94 DR350 rebuild

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plugeye

plugeye

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Location
garland, Texas
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time for a fresh top end
 
What was the before compression? I notice 6 valve springs, 4 intake? This is 20 years old, wonder if the parts are easy to get?

Dang near looks like you might have been able to do the top end without removing the engine?
 
SL350 said:
What was the before compression? I notice 6 valve springs, 4 intake? This is 20 years old, wonder if the parts are easy to get?

Dang near looks like you might have been able to do the top end without removing the engine?
Click to expand...

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i wanted to know the before compression, but didnt know how to accurately measure with the auto CR.
the 6 springs are from the clutch, its a 4-valve head.
yes, there are still mucho parts. the parts came in with no backorders.
 
top end looked to be in fine condition for a spare.
the valve job was done around the 4th on a complete head with camshaft I'd bought before.
the cylinder from a 96 dirt parts bike was deglazed by the same machine shop.
new rings gapped and installed in the piston from the same 96 dirt engine.

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Since the clutch is disassembled, are you going with new plates? Was it sitting very long?

I am pretty close by in Mesquite, holler if you need help or a tool I might have.
 
SL350 said:
Since the clutch is disassembled, are you going with new plates? Was it sitting very long?

I am pretty close by in Mesquite, holler if you need help or a tool I might have.
Click to expand...

the clutch has much meat remaining, so its good. not sitting at all, rode it up until tear-down.
thank you for the kind offer, i'll let you know
 

pulled the 20t primary drive & oil pump driven gear set, replaced with an early year single 22t primary gear and a new cam chain.
i'm replacing the 64t with a 62t clutch basket to raise the gearing for street use.




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top going back together
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http://www.mototuneusa.com/break_in_secrets.htm

Try this. It's basically what I've always done to cars, trucks, bikes. For example, my 4Runner now has 240K on it. Never even opened the engine. No smoke, no leaks, never have to top the oil, same mileage as new, same compression (yes, I've checked). Plus, I drive it like I stole it.

As always, YMMV, but this works for me.
 
yep, i've read that & believe in it.
rode it hard for the first 20, changed the oil & keep riding hard for another 15 fillups.
thanks
 
That break in procedure is the new oil wars. Lots of people on both sides. Aviation on the ride it hard side.

Last two engines I have broken in hard. It will take a decade or two to find out the results. Both were ct90s and they HAVE to be ridden hard most of the time just to get going.
 
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threads pulled out of this hole. repair with heli-coil coming this weekend
 
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Well this has been fun watching!

On a related note, the brake caliper came in. Had to order the compression washers for the brake line which should be in this week.
 
motor is performing great. still running it hard, now at 600 miles on break-in. no detectable oil consumption!
 
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