Stock is 45.

Can you post the listing? Never seen pressed in jets for sale before.

 

My Haynes book says 45 for slow jets on all models. Check FSM for confirmation but when I did 650 carbs everything matched.

 

KeiHin PRESS-IN PILOT JETS for VB Carbs CB/CM400-450 Twins '78-'82 CX500 #35 | eBay

CM400 twins '78-'81. CX500 '78-'82. Honda CB400 Twins '78-'81. CB450 Twins '81-'82. CM450 Twins '81-'82. Carburetor Idle jets. In cases of these parts we ask that you check the item out thoroughly before buying.

www.ebay.com

I found that ebay listing. It says they are made in Japan.

 

They only make up to 40 wonder if that would be enough.

 

Unfortunate, possibly open pilot screws more to compensate for smaller jets? On the vt1100c I opened the exhaust a bit by drilling baffles, and as it was sluggish off idle before mods I increased pilot size one, and mains one size also. Much better response and plugs look good. On old bikes I recall getting miniature drill bits and enlarging jets by hand, pilots are very tiny tho,,,

 

Just searched ebay for wire size drill bits, many sets available, not too expensive. Would be a painstaking job but possible if correct size is available, I've seen some very small bits,,,,,,

 

So you think getting a set and enlarging the holes?

 

Definitely possible,,, if done that way one could take indexed bits and find bit that just fits undersized jet, then carefully hand drill with next size. Possibly a dab of oil on bit would make cutting easier, but bits are steel and jet softer brass so it might go relatively easily. Just no forcing as a tiny bit could break easily. A micrometer would confirm size of bit used for enlargement, as jets are sized by metric equivalent I think. Then again, just opening pilot screws farther will allow more fuel into idle passages also.

 

try jets are us

 

Just looked, see a size 45 jet of similar configuration, don't know exact dimensions but listed for Kehin carbs, 11$ each, didn't look at shipping.