Z1OwnersClub GB

Got my Z1B running today it starts ok but wont tick over smoothly and is running very rich black spark plugs and black smokey exhaust. carbs are standard been ultrasonic cleaned new jets gaskets and needles, float heights set, slide heights set,checked cam timing several times, new dyna ignition but standard coils and leads can anybody help getting really p****d off with it

need more air.

Needs less Fuel!....seriously though have you set up the air screws and tickover as per the manual,it may help sort the tickover running problem and richness then as well.

hal wrote:Got my Z1B running today it starts ok but wont tick over smoothly and is running very rich black spark plugs and black smokey exhaust. carbs are standard been ultrasonic cleaned new jets gaskets and needles, float heights set, slide heights set,checked cam timing several times, new dyna ignition but standard coils and leads can anybody help getting really p****d off with it

Hi Hal
when I commissioned my 73 - with refurbed carbs/new jets etc - I found I had to set the idle screws to 2 turns out. One pot is significantly more.
Suggest you get a colortune kit - very good guide to combustion and easy to use.

I had similar problems with my Z650b1. I messed about for months and stripped the carbs twice and it still ran like a pig. I bought a colourtune and vacuum gauges which cost about eighty quid and all my problems were sorted. The carbs were set up as per the book but were miles out on the mixture and balance. Its as smooth as silk now and I would have still been messing now if I hadnt bought the kit.

Needle Jets! I think these little chaps are often overlooked. They don't unscrew & have to be drifted out. They are not included in most carb kits, so never get changed. They are also going to be affected by mechanical wear from the needle, unlike main & pilot jets whose only wearing factor is the amount of fuel thats washed through 'em.
Allens sell 'em at around about a tenner each Still getting round to sourcing some for my Z1000

Important to get the fuel levels set correctly too. Have you got the correct emulsion tubes in? These were changed for the shorter ones during Z1 run, along with slide change etc to overcome over-richness at idle & low revs. Take a look at the service bulletin 1/2way down this webpage.

http://www.wgcarbs.com/index.php?option ... &Itemid=26

Mike

Thanks for the replies. The link Mike posted to the Wiredgeorge site is full of usefull info. i will take the carbs off (again) and check the float heights and the emulsion tubes. going to leave it a few days because ive really had enough but i will post again if i sort it out

hal

any exhaust or air box/air cleaner mods?

Standard airbox with standard filter and marshall deeptone 4 into 1

any aftermarket install requires adj to carbs and timing.

Make sure no fuel getting past choke sliders either not shutting off tight or there is a seal on the bottom which degrades with time alaso have you checked shim clearances? Paul J..

in some time after ultra sonic cleaning the small miniature balls that were pressed into the body to close the bores from manufacturing went missing. after that you have too rich running in fact of gas flowing through these holes. i hope my english is not too bad

regards
amir

Good Point Ginge,everything replacable except these have been replaced on my carbs and they still run slightly rich,i have a new set of needle jets number 258 i keep meaning to fit but would rather ride the thing at the moment,maybe do it in the new year.

Z1RII wrote:in some time after ultra sonic cleaning the small miniature balls that were pressed into the body to close the bores from manufacturing went missing. after that you have too rich running in fact of gas flowing through these holes. i hope my english is not too bad

regards
amir

when the carbs were ultrasonic cleaned one of the drilling blanking balls did fall out luckily it was found in the bottom of the tank so i refitted it and checked all the others but its worth keeping this in mind when using a ultrasonic cleaner as they do loosen things off !!