Suzuki JR50 Oil Pump and Clutch questions.

jhermann

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Jul 10, 2008, 11:14:51 PM7/10/08

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Hi,

I don't have a manual for this bike yet, so these questions may be
easy.
I have a 1980 JR50 that I'm trying to get running for my kids.

First Problem: If kick starting hard, the clutch slips thus the crank
does not turn.
I have adjusted the clutch by turning the adjustment under the small
clutch cover
until it starts to resist, then backed off by 1/4 turn; read this
procedure on the internet.

Second Problem: The cylinder fills up with oil from the oil pump
PDQ. Is there
an adjustment for this, or are the parts that need to be replaced to
fix this.
I can mix the gas, but would prefer not to. Also, there is a small
screw on
top of the clutch side cover that has a rubber seal; is this an
adjustment for
the oil pump flow rate? This screw is currently completely screwed in
and tight.

A manual sure would help me; is there a PDF of one on line anywhere?

Thanks for any help.

jhermann

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Aug 5, 2008, 4:37:50 PM8/5/08

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I'm following up to my own post to report what I found out about my
oil injection problems with a Suzuki JR50.
The check valve located in the clutch cover housing turned out to be
bad. Replacing it solved the cylinder filling
up with oil problem.

I have another question...

Does anybody know if a clutch cover for an ALT50 would fit on a JR50?
I know the engines are not the same
and have different crankcases; but they look very similar.

mike0...@gmail.com

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Mar 12, 2015, 1:37:02 AM3/12/15

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Hey I dont know if you still need help on this but i have a manual pdf you can have a copy of , as for the clutch cover alt 50 motors are jr50 motors just slight changes it depends on the year I have a 82 suzuki the last of the phase 1 bikes which is giving me troubles in starting. I dont have much experiance in jrs' but i may be able to help and you may be able to help me.

nemc...@yahoo.com

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Oct 25, 2016, 3:21:05 PM10/25/16

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nemc...@yahoo.com

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Oct 25, 2016, 3:32:29 PM10/25/16

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Does anyone know which way the oil pump check valve spring and plunger go in to the rotor valve on the Suzuki JR50? I have seen them installed both ways in different exploded veiws.
The only way I Can see it working is the plunger goes up toward the cam in the oil intake cap.
Hope some one can help.

Mark Olson

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Oct 25, 2016, 3:37:13 PM10/25/16

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If this isn't clear enough, I don't know what to tell you. Looks
pretty unambiguous to me.

http://www.partzilla.com/parts/search/Suzuki/Motorcycle/2002/JR50/CLUTCH+COVER-OIL+PUMP/parts.html

nemc...@yahoo.com

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Oct 25, 2016, 4:05:39 PM10/25/16

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Thats the way I figured it goes in. Check out the exploded view that Bike Bandt.com uses on their web site.It has them with the spring toward the cap, which almost impossible to install.
Anyway, having trouble with pre-mix oil filling crankcase. Engine dies and won't restart. Installed new spring and plunger same problem. Any ideas?

Mark Olson

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Oct 25, 2016, 4:51:34 PM10/25/16

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Can't see why I would bother looking at bike bandit's drawing rather than
tge official Suzuki drawing on partzilla's web site.

no idea what's causing your problem, sorry.

fjoh...@gmail.com

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Aug 8, 2019, 10:59:55 AM8/8/19

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