11-16-2005, 08:43 AM
Does anyone have an tips for cold starts with FCR carbs. I got a set of 41mm on my CBR 900 now and without the choke it is tough to start when cold (around 50 deg).
Saturday I was unable to to get fired, and ended up draining the battery to where I had to bump start.
Any tips (I did give it a few turns of the throttle to get fuel in the carbs and chamber as the tuner said) would be very helpful.
11-20-2005, 02:08 PM
I had FCR carbs on my 96 honda cbr900. What I did was turn the throttle 3 full times first, then try and crank it. If it didn't start I would turn it 3 more times andtry it again and it would catch. Then I would just give alittle throttle for 10 seconds then it would ideal fine and continue to warm up. One thing with these carbs are its very easy to flood them. Thats what maybe you did. Don't give gas while hitting the starter. Or if you have to give gas give very little. Try what i did fist and see what happens after you unflood the bike
FCRs basically turn your sport bike into a dirt bike.
The key to living with them is understanding when the engine wants fuel and when it wants air.
When it wants fuel, twist the throttle and close it before starting. This is usually when the motor is cold. How many times to turn it full open depends on when.
When it wants air, twist the throttle and leave it open before trying to start it. Unfortunately, this usually occurs when the motor is hot and hard for the starter to turn over. Having the throttle open when trying to turn over a high compression bike is really tough on the starter. Maybe impossible.
With a dirt bike, having to kick it through this out in the middle of nowhere gets you in touch with what the engine wants in a hurry. You also always carry spare plugs and the tools to change them.
It's pretty much a matter of maintaining top notch starting ability, plugs-carb sync-idle mixture, and learning what the engine needs when.
I'd go back to a set of stock carbs, FCR's just are not worth it on the street.
11-20-2005, 02:47 PM
For cold starts I turn up the idle screw about 3 turns, then 3 full throttles, then hit the starter button.
11-21-2005, 05:09 AM
I gave it 2 full turns then tried it. Then gave it one more turn, then tried again. Then I began trying to give it 10-20% turn and starting it at the same time.
I will start now with full turns. If that doesn't work I will try the idle screw. It is all ready set to idle at about 1500-1600 rpm.