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Old 07-18-2013, 08:06 PM   #8296
davek181
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I always assemble dry too. I space the ring end 120 degrees apart. I don't put any oil on anything in the cylinder but the wrist pin, haven't for years. Never had a comeback for oil burning of seizure, in fact they usually have great compression and less than 5% leakdown after breaking in.

OH, I don't hone either, haven't honed a hole since 1980 when Honda told me it was unnecessary.
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Old 07-19-2013, 03:40 AM   #8297
RFVC600R
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Well.... I just wanna ask if there is a trick to getting the valve keepers in. It's just a little tedious I'm changing the valve seals right now so I don't have a smoking engine when I run it later.
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Old 07-19-2013, 03:57 AM   #8298
Homerb
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Quote:
Originally Posted by RFVC600R View Post
Well.... I just wanna ask if there is a trick to getting the valve keepers in. It's just a little tedious I'm changing the valve seals right now so I don't have a smoking engine when I run it later.
Ive just done a 16 valve head on my wifes car. A thin screwdriver with a dab of grease for the keeper to stick to worked well for me. Make sure theres a bit of grease on the inside of the keeper so it sticks to the valve stem.
A slightly magnetized screwdriver helps too.
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Old 07-19-2013, 04:41 AM   #8299
RFVC600R
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New valve stem seals in, just another step done!
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Old 07-19-2013, 07:15 AM   #8300
Aaron from Texas
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Quote:
Originally Posted by Schrauberklaus View Post
Then check that all external hoses are correct connect and without leak .

Aircut Valve check : remove Diaphragma push the small plate by hand with a small screwdriver , check by eye its moving in and out then test its sealing with a few drops of gasoline
Visually, the vacuum lines look great. Guess I'll have to take the carbs out again... dammit. I might try that other spring too.

Something certainly went awry when I did the diaphram. Certainly. The bike was running pretty good beforehand, and I never got that odd misfire or erratic idle...


Another thing I've been reading about is disabling the air cut off valve entirely and richening the idle circuit so the valve is no longer needed... Check these links out...

http://deuceswild.yuku.com/topic/1691

http://www.motorcycleproject.com/mot...hite_paper.swf
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Old 07-19-2013, 03:13 PM   #8301
JimRidesThis
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Wicked

Finally, my XL is on the road!

Couldn't resist sharing a couple of pics from tonight's shakedown run...





Thanks for all the help folks!
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Old 07-19-2013, 04:06 PM   #8302
Chet Jr
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Looking to rebuild several motors

I'm looking for a shop to rebuild a couple of motors within two months.

Does anyone have a recent positive experince they can share?

Thanks
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Old 07-19-2013, 04:31 PM   #8303
mcma111
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Engine Rebuild

Where are you? I rebuild Honda singles. I'm working on four right now.

http://advrider.com/forums/showthread.php?t=713831
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Old 07-20-2013, 04:32 AM   #8304
RFVC600R
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I have been thinking, I don't have a way to measure the valve springs and if they were (probably are) out of spec I won't be able to afford to replace them. So, should I use the springs from my '83 head with 15K miles or 84' with 28K miles??I want to use the springs from the '83 but I don't know, the old XL ran excellent before the valve seat came loose.What happens if the springs are out of spec?
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Old 07-20-2013, 05:27 AM   #8305
brucifer
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Quote:
Originally Posted by RFVC600R View Post
I have been thinking, I don't have a way to measure the valve springs and if they were (probably are) out of spec I won't be able to afford to replace them. So, should I use the springs from my '83 head with 15K miles or 84' with 28K miles??I want to use the springs from the '83 but I don't know, the old XL ran excellent before the valve seat came loose.What happens if the springs are out of spec?
If the springs are out of spec, it means they have lost some tension. If they lose tension they can lose their ability to close the valve at higher RPM. If they lose their ability to close the valve when necessary, the valve can hit the piston, if the valve hits the piston, you bend a valve and the head comes back off. If that all happens, you will be unhappy.
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Old 07-20-2013, 01:20 PM   #8306
cdiver666
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Hey I picked up a 86 xl600r. Used it offroad only in the Massachusetts state parks while I was waiting for my road test and to get through the Navy red tape. Now it is street legal and I can use it for commuting also.

It has a cobra pipe and XR's only oil temp dipstick.

I rode it from my apartment back to my house, about a 5 hour ride. It was pretty sketchy on I90 but the wind wasn't too bad after I tightened all the straps on my backpack. My biggest concern was at higher speeds I saw temps of about 320. The way back was a little worse and it was more like 325. When I got back to the apartment I parked it and the next morning it had leaked out some oil. I topped it off and it leaked a bit more out but no longer leaks now it appears. So I rode it to work and on the way back it would not idle without dying, so anytime I gave it the clutch I had to gas it.

It ran great before, maybe I have to clean the carbs again but I'm worried about the overheating. Think it caused some real damage? I was hoping to ride it this season before overhauling it during the winter.
thanks guys, been reading the thread, great stuff.
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Old 07-20-2013, 01:40 PM   #8307
mcma111
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cdiver666,

You may have overheated the engine and damaged the piston. How low did the oil level get? Where was it leaking the oil from? Going from a good running engine to not wanting to idle is not good.
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Old 07-20-2013, 02:45 PM   #8308
RFVC600R
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Quote:
Originally Posted by brucifer View Post
If the springs are out of spec, it means they have lost some tension. If they lose tension they can lose their ability to close the valve at higher RPM. If they lose their ability to close the valve when necessary, the valve can hit the piston, if the valve hits the piston, you bend a valve and the head comes back off. If that all happens, you will be unhappy.
Ok so I'm gonna use the springs from the '83 then. Half the mileage so maybe half the wear?? The piston and valves don't show signs of hitting each other before, I only over revved it couple times

God I wish I had money, I woulda just shipped this lump to MCMA and get the Engine Dynamics treatment and be riding by now with no worries. I'm saving my original head for machine work next time I tear her down.
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Old 07-20-2013, 04:00 PM   #8309
RFVC600R
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Got my hands on a measuring caliper, Gotta resaerch how to use it then measure all these springs and valves.
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Old 07-20-2013, 04:10 PM   #8310
RFVC600R
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'83 Valve springs

outter
#1 1.465 in
# 2 1.475 in
#3 1.465 in
#4 1.470 in

Inner
#1 1.305 in
#2 1.310in
#3 1.310 in
#4 1.312 in

Gonna go get my book from my bro's garage and compare specs then measure the '84 valve springs. Then I will use the best springs for reassembly
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