Triumphrat

brumey · 11-03-2007

Hello:
I purchaced my 'new to me' sprint a week ago. The owner said it always needs a blip on the throttle while cranking so it starts. I have done this and it does start. I have not cranked it long enough to see if it starts under it's own brain and fuel injection stuff.

Should the bike start without touching the Throttle?

I read somewhere about the ECU (brain) doing a delayed firing. For what reason I don't know and would this be the cause.

Thanks,
Kevin

DaveM · 11-03-2007

Hi mate,
as far as I know you are generally better off not touching the throttle at all and let the ECU do it's thing.
When you touch the throttle you are affecting the sensors and most likely telling the ECU something it shouldn't be hearing.
My understanding this is pretty standard on all fuel injected engines.. do not touch the throttle.

In extremely cool weather I think 1/4 held open helps but it doesn't get cold here so I don't know for sure about this. And I'm not sure if it's a good idea or not.

I am not really a tech whizz (keep the laughter in the cheap seats quiet please)

But there are plenty here who are very knowledgable members here that will be keen to assist you.

DaveM

1050STrider · 11-03-2007

When the dealer was going over everything on my 06 when I picked it up he said not to use any throttle while cranking and to even resist blipping the throttle once it started till the idle dropped to normal. He mentioned the same thing DaveM mentioned...sending wrong signals to the ECU, mainly during warm up.
Speed Safe,
Don

brumey · 11-03-2007

Thanks...I am at a disadvantage now because I don't have the owner manual. I am actually one of those people who read it! The previous owner 'supposedly' has it and will sent it soon so I should be able to answer my own silly questions.

I know my last bike (BMW R1150 RT) did not need any throttle assist. The guy I purchased it from was not someone to read the manual so I suspect he made up his own faster starting procedure.

The bike is currently draining oil and I am replacing an alternator gasket that is leaking. Once I get this done, I'll try starting without any right hand intervention.

Have a great evening....

Kevin

Mr2U · 11-04-2007

i use no throttle during a cold start.

however, when i do a restart from a quick stop, and the bike is
hot, i do use the throttle. but not like you think.

i hold it slightly open while i hit the starter button, and while the
bike is turning over, i let go of the throttle and let it snap closed.
as soon as it snaps closed the bike starts instantly.

Sprint1050DA · 11-04-2007

I was told to keep my hand well clear of the throttle during any type of start for at least the first minute of operation. I was told that getting on the gas too quickly was the cause of a set of fouled plugs in my bike.

SpiderTex · 11-05-2007

Quote:

Originally Posted by DaveM

Hi mate,
<stuff deleted>
In extremely cool weather I think 1/4 held open helps but it doesn't get cold here so I don't know for sure about this. And I'm not sure if it's a good idea or not.

I am not really a tech whizz (keep the laughter in the cheap seats quiet please)

But there are plenty here who are very knowledgable members here that will be keen to assist you.

DaveM

Even at minus (celsius) degrees I don't touch the throttle... Sprint starts allways.

/off topic: Test driven a Moto Guzzi Norge a month ago, on that machine you don't even hold the start-button, a relay takes over and keeps the start contact until the machine turns

dolson · 11-05-2007

Gota remember one thing. These are direct F/I engines that are totally controlled by the ECU.

There is no choke or accelerator pump. If you hold the throttle plates more open you have more air going into the pump (engine). But the injector shots are not giving any more fuel. So a cold start is going to be leaner which is the opposite of what you want.

Now I'm not sure other than urban myths on the '05 up models but if you touch the throttle on a '04 down while starting you are resetting the throttle position sensor. Whatever position the throttle plates are at when the EUC takes a hit is where the ECU assumes the closed idle throttle position is. SO, while running if the throttle isn't at that position or higher the bike won't run.
For instance if the ECU take a hit at the point where the throttle plates would normally be at around 2,000 RPM it would set 2,000 RPM as the closed throttle idle position.

I would say for those that have the '04 and older F/I bikes, DON"T touch the throttle at any time cold or hot start. There is no need and you are not pumping more fuel in. If you do have starting issues there is a problem and is not user fixable other than shot plugs.

On the '05 up it's still F/I with a newer generation ECU. Still though, If you pump or hold open the throttle you are still not doing anything but letting in more air which is counter productive.

I don't really buy the fouled plugs thing. These bikes are notoriously mapped lean for emission standards. I would more buy a improper or pour fuel angle on things.

Te best advice I could give is when turning on the key WAIT until the fuel pump regulator finishes pressurizing the fuel system. You can hear the F/P regulator click off. At that time you have a purged fully pressurized system to the injector nozzles.

Doing this I have never had a starting issue cold or hot from 15*F to over 110*F ambient air temperature.

Don

brumey · 11-05-2007

Okay - I finally finished my oil leak repair and had a chance to start the bike without touching the throttle. I turned on the ignition and waited 5-7 seconds until I could not hear any more pump noise. I then pressed the started and had to crank for what seemed like 3 seconds. I did not accuratelly time it but I will next time.

I guess this was not exaclty scientific as I had just changed the oil and filter letting it drain for 30 minutes.

I'd be interested to know how long others have to press the started before it fires up.

Thanks,

Kevin

pushr0d · 11-06-2007

3 seconds sounds about right for a cold start.

My '03 used to take what seemed like ages to cold start, until I did the regulator mod.

I don't know if the '05-on bikes have the same issue.

The Triples seem to run better with some miles on them. Now that you've fixed the oil leak, go ride!