New Police Bike Owner

rayspeed · Post by **rayspeed** » Thu Oct 01, 2009 6:57 am

Hi all,
I bought a 1974 cb 360 police bike (formerly in service with the austrian police corps) two years ago as a basketcase and completed it last summer.

I have experienced some unnerving troubles which turned out to have been caused by worn needle jets and carb needles resulting in fouling plugs every 5 miles or so.

Now she runs quite well except I have to top up fuel after 60 miles otherwise fuel pressure is too low and the bike only runs on one cylinder although everything (tank, lines, petcock,carbs) has been replaced or revised :-(

Nice machine anyhow and my favourite ride around town as long as there is a gas station around (I also have a 1998 Royal Enfield Bullet, a 1960 Matchless G5 and a 1957 Messerschmitt Vespa GS 150)

Greetings from Vienna, Austria

Michael

e3steve · Post by **e3steve** » Thu Oct 01, 2009 4:27 pm

Michael, welcome to our humble forum! Now, take that thing away and come back with a 305........... Just kidding!

Now she runs quite well except I have to top up fuel after 60 miles otherwise fuel pressure is too low and the bike only runs on one cylinder although everything (tank, lines, petcock,carbs) has been replaced or revised :-(

Have you checked the fuel cap vent for blockage?

Regards,

Steve

rayspeed · Post by **rayspeed** » Fri Oct 02, 2009 4:01 am

hi steve,
thanks, i would prefer a 305, but I must admit I have never seen any of these bikes around here, not to mention one for sale.

i have checked the fuel cap, ventilation is ok.
yesterday i wanted to check the idle speeds of each cylinder separately (kind of synchronisation) just to find out that the right one is not idling at all with the plug pulled on the left one. it seems too rich, even with the idling screw turned all the way in. that would also explain the excessice fuel consumption around town with a lot of traffic light stops. will have to start again from scrap.
regards,
michael

e3steve · Post by **e3steve** » Fri Oct 02, 2009 7:33 am

Michael, don't know about the carbs on later bikes such as yours, but with the Kei-Hin PW22 & PW26 on the CB72/77 it is easily possible to get the left & right slides back to front and in the wrong carbs! This makes for an unfathomable richness in the mixture department.

If your carbs are similar in design with cable-pull slides (and not Constant Vacuum), take the intake connector tube of one and see if you can observe the slide's cutaway. If not, and the bottom of the slide appears as a flat-bottomed cylinder, then that's a good place to start.

G'luck!