CD 175 carburettor

[Richard Pitman]

I've just bought a CD175 engine, complete apart from the carb. Hopefully will collect it next week, only 20 miles away. Engine is described as being in good condition, low mileage etc. I bought it as a source of spare parts, but it would be nice to hear it running, so I wondered if anyone could suggest a suitable aftermarket carb for it, as original CD175 carbs seem to be rather thin on the ground.

 

[moaman]

If you cant find a carb, just stick a hose into the top of a jar with a little bit of petrol in it and feed it into the intake .... I have run engines on fumes before ...

 

[Windmill John]

Can’t believe the price of this, but if just for testing. Read the reviews first, sounds like idle needs turning down first and checking for loose swarf inside:

https://www.amazon.co.uk/Carburetor-Motorcycle-ATC185-ATC200-TRX250/dp/B07TMCXKYS/ref=asc_df_B07TMCXKYS/?tag=googshopuk-21&linkCode=df0&hvadid=394226952402&hvpos=&hvnetw=g&hvrand=1271738475353137211&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1007058&hvtargid=pla-871908694244&psc=1&mcid=f1ffe3b4377933209f01d07f5bd60fcd&tag=&ref=&adgrpid=87233668532&hvpone=&hvptwo=&hvadid=394226952402&hvpos=&hvnetw=g&hvrand=1271738475353137211&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1007058&hvtargid=pla-871908694244

 

[Richard Pitman]

Thanks, yes, I've been looking at those 'Keihin PW22' carbs on Ebay, but that Amazon one is even cheaper. I think I already have one in a box up in the loft but couldn't find it this morning, sure that engine would at least start up and run with one of those.

 

[Windmill John]

Why haven‘t you popped one on from your CB?

 

[Richard Pitman]

Oddly enough, I did try offering up a CB carb. With the extended CB manifold fitted, the mounting studs line up but the carb is rotated sideways by 45 degrees or so. I haven't tried the carb on it's own, not sure that the venturi lines up correctly. CB carbs are nominally 20mm as opposed to CD 22mm. Worth a try though.

 

[Windmill John]

At least the 20mm is the right side of 22, so won’t restrict flow.
But…. will you have to lean the bike 45 degrees to test!

 

[Richard Pitman]

Found my new Keihin alike carb in the loft last night. Actually seems very nicely made, venturi is correct diameter, but mounting holes are off set by a few mm so that when fitted it doesn't quite line up. Nothing that a file and some locating dowels won't sort. I hope ...

 

[Richard Pitman]

Test fit on engine.

 

[ancientdad]

Looks pretty close right now.

 

[Flyin900]

They actually have the nerve to put Keihin Japan on the casting? Looks like you switched out the float bowl, so did that line up correctly on the body? Do they also stamp the jets Keihin too?

 

[Richard Pitman]

No, that's the float bowl that it came with. Fitted with three cross head screws rather than a quick release clip, but looks as though it will be leak proof, 'O' ring in groove on mating surfaces. Jets are not marked, neither for brand or size. Leakproof plastic float and viton tipped float needle.

Agreed, very cheeky to use the Keihin logo, the cloned 175 carbs I've used at least had the decency not to do that. That said, there's loads of Mikuni knock offs out there, complete with Mikuni logo, so called 'Chikuni's'.

 

[Flyin900]

LOL Chikuni's. I've heard that these knock off carbs actually work quite well and are a good option, since a NOS part is long gone, or crazy expensive if still available. So at least you have an option. Clearly no fear on getting sued by Keihin in China.

 

[ancientdad]

Clearly no fear on getting sued by Keihin in China.

Agreed. Must be nice, at least from a government standpoint, to be able to simply not give a crap about the rest of the world and the rules most go by.

 

[Windmill John]

I assume, or guess if Chikuni is right and they made carbs for old BMW Airheads, they’d be called Bongs….. sorry, meant Bings.