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Author Topic: '72 CL175 engine trouble?  (Read 695 times)

Offline teazer

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Re: '72 CL175 engine trouble?
« Reply #10 on: Dec 03, 2017, 16:25:12 »
Plugs look close enough for government work.  FOcus on the other items such as carbs, timing, exhaust etc and let it rev.  I don't remember the red line on that bike but somewhere closer to 9500 would work for shift points.

Offline cxman

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Re: '72 CL175 engine trouble?
« Reply #11 on: Dec 03, 2017, 16:43:03 »
how long has it been sitting?
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline echo

  • Posts: 17
Re: '72 CL175 engine trouble?
« Reply #12 on: Dec 03, 2017, 19:28:17 »
I'm not sure how long it was sitting but obviously a 45 year old bike with 5000 miles did an awful lot of sitting  ;).  When I drained the oil it was black and smelly.  I have heard that bikes which sit too long tend to develop pits in the cylinder at the spot where the rings come to rest.  I wonder if it sat on the side stand a long time and maybe that's why the left cylinder has lower compression.  All speculation of course.

Is there a good thead out there on checking timing on an electronic ignition?  I've been willfully ignorant on that subject to now.

If everything else checks out I'm going to run it hard for a while and see if I can bring the compression up a little.

Ultimately I would like to rebuild the motor anyways  if for no other reason than as a "fun project"

Thanks guys

Offline cxman

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Re: '72 CL175 engine trouble?
« Reply #13 on: Dec 04, 2017, 10:04:17 »
dont fix what is not broken

check teh valves in fact set them 2 thou loose in case you have some carbon or crud build up 

reset the valves to stock setting after 100 miles

run it for a bit ride it in town so you are changing rpm a lot by shifting

up and done in the rpm is what you want to re seat the rings

2-3 oz of marvel mystery oil in the tank may help as well

dont run it full bore yet

check every 50  if compression is increasing

change oil and check oil screen at 200 miles
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline echo

  • Posts: 17
Re: '72 CL175 engine trouble?
« Reply #14 on: Dec 04, 2017, 21:38:10 »
Great I'll give it a try and let you know how it goes. 

Offline echo

  • Posts: 17
Re: '72 CL175 engine trouble?
« Reply #15 on: Dec 05, 2017, 10:59:16 »
Last night I checked timing, valve clearance and the petcock. 

Timing was a couple degrees early.  I rotated the plate very slightly so the test light comes on just as the F mark lines up with the index mark on the case. 

The valve tappets had moved a bit since I set them before.  No clearance.  Perhaps the valves were not even closing fully.  I set them a little loose for now as cxman suggested. 

The petcock screen wasn't clogged, but there were some nasties in there that needed to come out. When I put it back together it leaked, so I need to see what the issue is tonight.  Maybe a pinched o ring or something.

Offline echo

  • Posts: 17
Re: '72 CL175 engine trouble?
« Reply #16 on: Dec 07, 2017, 20:46:53 »
Got my bottle of magical marvel mystery oil at Wally Mart tonight.

What do y'all think I should do with it?

a) put it in the gas
b) put it in the oil
c) put a little in the spark plug hole and let it soak in
d) all 3
e) drink some
f) go away ;D

Offline teazer

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Re: '72 CL175 engine trouble?
« Reply #17 on: Dec 08, 2017, 17:34:48 »
Yes...

CXman suggested adding some to the fuel.  I prefer to use Seafoam to clean things out. How does it run now?  Any better since you set valves and timing?

Offline cxman

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Re: '72 CL175 engine trouble?
« Reply #18 on: Dec 08, 2017, 19:14:34 »
i suggested it in the fuel to clean and crap in teh top end and rings area
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline echo

  • Posts: 17
Re: '72 CL175 engine trouble?
« Reply #19 on: Dec 08, 2017, 23:28:22 »
I read on some other forum some guys suggested putting some in the cylinder to soak in.  On the bottle it says add to fuel (4oz per 10 gallons) or replace up to 20 percent of your oil with MMO. To me that sounds excessive.  I'm just gonna try it in the fuel for now. 

It's been cold as hell here in NC, so no chance to ride yet.  We have snow on the ground tonight.