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Discussion Starter · #1 ·
i have just install my new exhaust last night, but it is rough to start, even after loading a new tb tune.

do you adjust the prime pulse for better starts. it seems when i go into adjust prime pulse it will only decrease the value. has anybody done this adjustment. Thanks
 
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Discussion Starter · #5 ·
wayne got back to me at tuneboy with a fix so i should be able to increase prime pulse now. here in hilton head it was 80f today. I will try to change value tommorrow. thanks
 
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Discussion Starter · #6 ·
I adjusted the prime pulse from 12800 to 15000 to 23000 to 30000 and finally 40000. There was no benefit to increaseing prime pulse at least with my bike.

So i am going to stick with 12800 PP and do what avi8or does it works fine that way Thanks Avi8or for the advice.
 

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Generally speaking, all EFI systems are designed to start with the throttle closed. While I'm sure Avi8or's technique works for his bike, I think it is compensating for some other problem. Since adding more fuel didn't help and cracking the throttle does I think it is pretty obvious that the idle air control valve is not open far enough during cranking. Why? I can't say. Maybe there is some carbon buildup that is blocking airflow or some other defect. So far mine has always started quickly.
 

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My bike starts very easily with the throttle closed. The prime pulse set at 12800 seems to be even better than the stock setting. Also, you might try adjusting the fuel cells at low throttle and low rpm (350, 700, 1000 rpm) in both the F1 and L1 tables - when the bike is in neutral. Try 2% leaner, then 2% richer than the settings you now have.

IF you have not changed spark plugs on your bike, this COULD be one issue to a quick start. I have also found that the Denso iridium plugs seem to start and idle better than the stock plugs. This may be due to the finer electrode tip than the stock plugs and the NGK iridium plugs.
 

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The iridium plugs have tips that are MUCH finer than other designs. The Densos are even finer than the NGKs. This makes them harder to foul. This can also help smooth the idle by reducing misfires.

Many riders would be shocked by the number of times the normal bike misfires - especially at idle.

In some cases these plugs help, in others - not.

I do not like Denso plugs that are not Iridium, and the "racing" Densos are just a way to spend money.

My .02 - devalued by inflation and the current falling US Dollar.
 

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BOTH Denso and NGK make iridium plugs.

I buy Densos from sparkplugs.com. For NGKs I have a friend that sells them to me at wholesale - half the price of Denso's.

In several cases, I have found the Denso to run better and last longer than the NGK iridium. It isn't a big deal, but it is just MY preference - more than likely just a mental issue.
 

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vbil said:
wayne got back to me at tuneboy with a fix so i should be able to increase prime pulse now. here in hilton head it was 80f today. I will try to change value tommorrow. thanks
vbil- Do you still have the fix that Wayne sent to be able to increase prime pulse? I'm having the same issue.
Any luck getting the bike to start easier? My 98 Honda and my wife's ancient ninja both start much easier (when cold) than my 06 S3, despite new iridium plugs, tuneboy, removing potential obstructions to tank breather hoses, and every other solution I've seen posted...
 

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Zmann - make sure you have the latest version of TuneEdit.

Then try reducing the prime pulse in 2% increments to help cold start.
Also, make sure the idle is set correctly - sometimes 1200-1250 is better than 1300 rpm.

You might also try reducing the fuel tables at 0% and 1% throttle at 600 and 1000 rpm - right where the engine turns when starting.

I hope this helps.
 

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Devious- I tried all of your suggestions and it does start slightly better. Thanks.

current crank times (without touching throttle)-
engine cold = ~5sec
engine warm and recently turned off=immediate
engine warm but turned off for 20-30m=requires several attempts to start at 5-10 seconds each.

I can deal with it until Honda comes out with a new VFR or something interesting )
 
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