"Patina" The 1973 CB175 Cafe Racer

[1sttimer]

Re: "Patina" The 1973 CB175 Cafe Racer

That sounds good. Do you still have your mechanical advance?


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No I've had the Probe Engineering cam mounted electronic ignition from the start.

 

[1sttimer]

Re: "Patina" The 1973 CB175 Cafe Racer

No I've had the Probe Engineering cam mounted electronic ignition from the start.

Oh you are saying if I still have it....like you are suggesting I switch to it?

 

[1sttimer]

What rpm are you looking to idle at? Aren't the stacks going to limit your tuned rpm range, depending on their lenght

I honestly have not considered the limitations of the system. Good thought. I was thinking it should be idling at 1800 but lowest I can get consistently is 2500.

 

[1sttimer]

I'm also just considering biting the bullet and buying some VM20s...or I read back in Texas Star's rise from the ruins and saw Teazer thought the VM24's would be ideal...idk...dreaming.

 

[simo]

Are you sure the carb slides are in the correct carb? It's a common 'Bad/no Idle' mistake.
The left slide will fit in the right carb if it's put in backwards and vice versa

The cutaway should be facing the stacks/filter

 

[1sttimer]

Re: "Patina" The 1973 CB175 Cafe Racer

Are you sure the carb slides are in the correct carb? It's a common 'Bad/no Idle' mistake.
The left slide will fit in the right carb if it's put in backwards and vice versa

The cutaway should be facing the stacks/filter

Haha yes! Correct way. I did however make that mistake the first time I got the bike.

 

[xb33bsa]

I'm also just considering biting the bullet and buying some VM20s...or I read back in Texas Star's rise from the ruins and saw Teazer thought the VM24's would be ideal...idk...dreaming.

use your head, if you can't get it to run right with stock carbs, getting it running right with vm mikuni's will be impossible

 

[1sttimer]

Re: "Patina" The 1973 CB175 Cafe Racer

use your head, if you can't get it to run right with stock carbs, getting it running right with vm mikuni's will be impossible

I said I was dreaming

 

[xb33bsa]

hahahahah keep at it stock is fine

 

[1sttimer]

Re: "Patina" The 1973 CB175 Cafe Racer

hahahahah keep at it stock is fine

XB for mainly street riding, what would your preference be in intake solutions? The exhaust is stock. I'm not too keen on putting the airbox back on but I am considering temporarily doing that to take it back to 100% stock for a starting point at least. If I can't get it running there, may be something else?

 

[1sttimer]

Re: "Patina" The 1973 CB175 Cafe Racer

Also I believe the CL175 came with 22 mm carbs instead of the 20 mm that the cb175 has, and subsequently what I have on my bike.

 

[cxman]

what jets do you have 95/38s?

 

[simo]

From what I've read, I'm pretty sure that the 22mm carbs only came on the cl175 k0's ,the slopers and then went to 20mm with the verts k3 onward. My project vert cl175 -200 runs on 2 pw22's and idles fine at 1200rpm so I don't believe its because of the carb venturi size that's your issue

 

[1sttimer]

Re: "Patina" The 1973 CB175 Cafe Racer

From what I've read, I'm pretty sure that the 22mm carbs only came on the cl175 k0's ,the slopers and then went to 20mm with the verts k3 onward. My project vert cl175 -200 runs on 2 pw22's and idles fine at 1200rpm so I don't believe its because of the carb venturi size that's your issue

Great info Simo thank you.

 

[teazer]

XB for mainly street riding, what would your preference be in intake solutions? The exhaust is stock. I'm not too keen on putting the airbox back on but I am considering temporarily doing that to take it back to 100% stock for a starting point at least. If I can't get it running there, may be something else?

That sounds like a plan. Eliminate some of the variables. I'm the guy that uses VM26 on a 240 motor and 26mm keihins on a 175 and it would idle with a 2 into 1 pipe and stacks with race cam and so on.

With stock carbs it should run a little lean on stock jetting. Those carbs have a really tiny pilot jet discharge hole into the floor of the venturi which tends to clog up. If that is partially clogged it would be a problem. You are getting close now. Hang in there and it will come to you. BTW did you check the timing with a strobe light to see if it's close? I think you said you did but I can't find that post at the moment.

 

[Texasstar]

Re: "Patina" The 1973 CB175 Cafe Racer

Do you have an old stator cover to notch out like we have? How about checking the timing at full advance? http://youtu.be/jiVVRcnSAI0


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[1sttimer]

Re: "Patina" The 1973 CB175 Cafe Racer

Do you have an old stator cover to notch out like we have? How about checking the timing at full advance? http://youtu.be/jiVVRcnSAI0


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I prefer to get messy ha that's a good idea. I do have a spare and I'll notch it.

I have set timing at full advance and it fall right between the full advance marks at 4k.

 

[1sttimer]

Re: "Patina" The 1973 CB175 Cafe Racer

Hold tight guys, I feel like I'm guessing at it, so I'm going to buy some 95, 92 mains along with new 38, and 35 slows to bring this thing back to a point where I know it should work with some filters.

 

[1sttimer]

Re: "Patina" The 1973 CB175 Cafe Racer

BTW did you check the timing with a strobe light to see if it's close? I think you said you did but I can't find that post at the moment.

Yep sure did! That process sure is a lot easier with a kickstart

 

[Texasstar]

Re: "Patina" The 1973 CB175 Cafe Racer

I'm not familiar with your electronic ignition...but for grins I would want to know what it was doing through the revrange and how it was advancing the timing through the rev your current idle to 4k range...Luckys can be set to 1200 RPMs because we have the mechanical advance on but Victoria's we have the mechanical advanced locked in place so it idles about 2500 RPMs...that being said lucky ends up being on the idle jets but I'm not sure if Victoria is directly on the main Jets at 2500 rpm


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