"Patina" The 1973 CB175 Cafe Racer
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1sttimer
Over 1,000 Posts
Re: "Patina" The 1973 CB175 Cafe Racer
Velocity stacks (cb750 airbox boots) on the inlet wide open right now. Exhaust is a stock CL175 with muffler.
Carb settings are 90 mains and the needle clip is at the middle notch. I wanna say I have 38 slows but my memory escapes me right now on that.
Stock CB175 is 98/38 and stock CL175 is 90/38. I believe the 200 ran 95/35.
Interesting note is that the right plug is kinda a chalky light brown/black and the left plug is wet black. But then again I haven't changed plugs in 30 miles or so.
xb33bsa said:my point is 197,711 175 hondas run perfectly good on stock timing settings
yours does not,hence it is not the timing DUH
Velocity stacks (cb750 airbox boots) on the inlet wide open right now. Exhaust is a stock CL175 with muffler.
Carb settings are 90 mains and the needle clip is at the middle notch. I wanna say I have 38 slows but my memory escapes me right now on that.
Stock CB175 is 98/38 and stock CL175 is 90/38. I believe the 200 ran 95/35.
Interesting note is that the right plug is kinda a chalky light brown/black and the left plug is wet black. But then again I haven't changed plugs in 30 miles or so.
1sttimer
Over 1,000 Posts
Re: "Patina" The 1973 CB175 Cafe Racer
I didn't reassemble the engine myself, had a "mechanic" do it but the new gasket set should have come with new O-rings I would hope...
Can you explain what those do? And I'll have to look back at the oil flow diagram to see which side that would affect. Oil goes up the right I think...? So O-ring would go on the right side. Going from memory and will have to look into it.
Plug on the left is the black one...yeah kinda oily at the threads of the head. But it's thin and smells like gas.
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acm177 said:
I didn't reassemble the engine myself, had a "mechanic" do it but the new gasket set should have come with new O-rings I would hope...
Can you explain what those do? And I'll have to look back at the oil flow diagram to see which side that would affect. Oil goes up the right I think...? So O-ring would go on the right side. Going from memory and will have to look into it.
Plug on the left is the black one...yeah kinda oily at the threads of the head. But it's thin and smells like gas.
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Id suggest posting pics of the plug before tearing the engine apart. If its super rich, it will be black but dry and a matte black color.
There should be two orings.
The 175 has oil passages for both rear outside studs. If the orings are in bad condition the headgasket may gently leak oil into the cylinder. Ive expirenced this problem with minimal signs of oil burning. One black oily plug. Mine was the right side, which flows more oil than the left.
I had peeked into the combustion chamber to check for oil by getting the bike hot, then removing the carbs and spinning the engine over to allow the oil to pump.
After a bunch of revolutions you could visibly see oil building up on top of the piston after pulling the plug for inspection.
There should be two orings.
The 175 has oil passages for both rear outside studs. If the orings are in bad condition the headgasket may gently leak oil into the cylinder. Ive expirenced this problem with minimal signs of oil burning. One black oily plug. Mine was the right side, which flows more oil than the left.
I had peeked into the combustion chamber to check for oil by getting the bike hot, then removing the carbs and spinning the engine over to allow the oil to pump.
After a bunch of revolutions you could visibly see oil building up on top of the piston after pulling the plug for inspection.
acm177 said:
those stud o-rings being bad or missing will not allow oil into the cylinder bores/combustion chambers :
, there is a fire ring on the head gasket, impossible to get oil past that into the bores,unless the head is on loose hahahahaha or uou have a blown fire ring,but then you would see fire as wellyou had other issues like rings or bad guides
1sttimer
Over 1,000 Posts
I went out to the garage today and had a change of heart. I decided to put all other projects on hold (which is why I've been away for a while) until I button this thing up.
I'm tired of bump starting the bike, I'm concerned about the gear teeth I found in my oil and so I'm cracking into the bottom end to see what's going on and to replace the kickstart shaft.
Please come along for the ride I'm going to need it. I'm absolutely intimidated but we will take it in stride and I'll take lots of pictures so you guys can see what I'm doing.
I figure, there is no sense in tuning the carbs if I plan on pulling the engine and re-doing stuff anyway.
I'm excited to get it right this time!!
Here's where I'm at (not very far)
I'm tired of bump starting the bike, I'm concerned about the gear teeth I found in my oil and so I'm cracking into the bottom end to see what's going on and to replace the kickstart shaft.
Please come along for the ride
I'm going to need it. I'm absolutely intimidated but we will take it in stride and I'll take lots of pictures so you guys can see what I'm doing. I figure, there is no sense in tuning the carbs if I plan on pulling the engine and re-doing stuff anyway.
I'm excited to get it right this time!!
Here's where I'm at (not very far)
HerrDeacon
Over 1,000 Posts
Good for you for diving in. Yes, they are simple engines to work on, it'll be fun and you'll learn a ton. I always look at this type things as opportunities to learn something new.
