Z1OwnersClub GB

Hi does anyone know how to improve cold starting on a zed with high compression Pistons bored out to 1100cc with cr special carbs
Starts fine when warm! Any ideas??
Thanks in advance
Lester

Napalm


Soz...... Couldn't help meself, I'm sure someone sensible will be along shortly.

I,ve always found cold start issues are mostly leaky choke plunger gaskets or low float bowl fuel levels. Assume cr's would be the same as mikunis in that respect.

warren3200gt wrote:I,ve always found cold start issues are mostly leaky choke plunger gaskets or low float bowl fuel levels. Assume cr's would be the same as mikunis in that respect.

Ok I'll try that cheers!

Ginger Bear wrote:Napalm


Soz...... Couldn't help meself, I'm sure someone sensible will be along shortly.

Lol nutter!

Run it with 10/40 oil. Semi once the rings have bedded in.
Back the timing off two degrees until its run in. Or fit a Dyna 2000 with retard mode.
Put the more powerful starter motor on it.
Do the coil relay mod.
Increase the cross sectional area of the battery positive lead from solenoid to starter.
Check, clean and remake if necessary the earth from the back of the engine to the negative battery terminal.
Fit a battery with more CCA.

AL

[quote="zorded"]Run it with 10/40 oil. Semi once the rings have bedded in.
Back the timing off two degrees until its run in. Or fit a Dyna 2000 with retard mode.
Put the more powerful starter motor on it.
Do the coil relay mod.
Increase the cross sectional area of the battery positive lead from solenoid to starter.
Check, clean and remake if necessary the earth from the back of the engine to the negative battery terminal.
Fit a battery with more CCA.

Ok where can I get a more powerful starter motor and what is the coil relay mod and have you got the make of the battery with more cant?
Many thanks for your patience!
Lester

http://www.wgcarbs.com/index.php/using- ... s/89-coils
coil relay mod.

I think APE do a very expensive high output starter but there is a version fitted to some H****'s that have more poke forget which model though. CB900 or something like it.

Relay mod is very simple and very effective. If the starter is drawing all youre current this may help to keep the coils fed.

http://www.wgcarbs.com/index.php/using- ... s/89-coils

Motobatt batteries tend toward higher CCA or at least if thats not true there are some in the range specifically designed to have higher CCA. I use an MBTX9U i think, and whilst half the size of standard it has something like 25% higher output for starting just a lower amp / hour rating.

Search for any of these items on this site using the 'search forum' facility at the top of the page and all will be revealed.

AL

Snap.

AL

H**** CB900 starter is supposed to give more grunt but no personal experience.

My 1260 Z900 runs CR35s. Everything Al says is correct. I dont need any choke. I use an external roller starter as no onboard electric. Couple of rotations to prime. Throttle shut and off she goes. Once warm will start with kick starter.

My Lawson has always been awkward starting from cold as Zorded and Martin can testify, although it bump starts very easily. I find that if I let the carb bowls full up properly it generally starts. However on my Endurance racer, with a similar engine 1170 and c.r. carbs, but different cams, it starts every time very easily, although it is running rich at the moment, which may help.
I am in the process of looking at getting a roller starter, so that I can start it properly every time.
Rob

Lester wrote:Hi does anyone know how to improve cold starting on a zed with high compression Pistons bored out to 1100cc with cr special carbs
Starts fine when warm! Any ideas??
Thanks in advance
Lester

Move to Northern Australia

Old H***** CB900 - or I use a GPz1100 s/motor which is 4-pole, rather than 2-pole

I guess it depends on specifically what your cold starting issue is when cold compared to warm? does it still turn over well when cold but just not firing straight away ?

I have z900 bored to 1015 with high compression - CR31 carbs and never any issues starting - it has standard starter but battery is lithium with high CCA.
I don't use the choke even in winter (garaged) as this can make starting from cold really difficult !
I make sure carbs are full and use a little throttle opening to start it then hold it there until warm enough to idle steady without any choke, but that works for my set up - it may not for yours.

If it is struggling turning over in cold then assuming there is no condensation or volt drop etc. in those conditions you may like to try as a cheaper option a battery with the max CCA (or borrow one to test) if that is your issue ?