OzSTOC

Honda ST1100 Section => Honda ST1100 General Questions => Topic started by: Streak on July 16, 2012, 10:47:14 PM

Title: ST1100 Running rough at start up
Post by: Streak on July 16, 2012, 10:47:14 PM
Hello all,

Have noticed the last few times I have started the bike cold, it runs like it is missing till it warms up and then it runs just fine, it is a 1996 ST1100

Fuel economy seems fine, everything looks ok, air filter looks fine, fuel filter looks ok? Services are up to date also

Thoughts or suggestions what I should look for

Cheers

Streak (Graham)
Title: Re: ST1100 Running rough at start up
Post by: bluehonda on July 17, 2012, 07:05:10 AM
 :bl11
Hi Streak,
My bike had a similar problem a few months back.
On start up it was really rough at idle and I had to jockey the throttle to keep it running, engine acceleration was really  slow.  After much Google searching I identified the problem and a carby strip was in order.  As a last ditch effort before that unwanted job I bought a bottle of "Total Fuel System Cleaner" (can't remember the brand, silver bottle) and it fixed the problem.
Best $24.95 I've ever spent.  I've been told by a mechanic that's often the first step to try and that Repco similar product but only sold to "trade".

Brad
Title: Re: ST1100 Running rough at start up
Post by: Streak on July 17, 2012, 07:48:52 AM
hi brad,
           Thank you for the heads up, is this the one your talking about?

http://www.nulon.com.au/products/Fuel_Treatments/Total_Fuel_System_Cleaner/#.UASMF2thiSM (http://www.nulon.com.au/products/Fuel_Treatments/Total_Fuel_System_Cleaner/#.UASMF2thiSM)

(http://i1222.photobucket.com/albums/dd499/ozstoc/d7661a82.jpg)
Title: Re: ST1100 Running rough at start up
Post by: bluehonda on July 17, 2012, 07:54:58 AM
That's the one

Brad
Title: Re: ST1100 Running rough at start up
Post by: Brock on July 17, 2012, 08:53:55 AM
Maybe the PM800 has done something for my fuel system, I havent had to use the choke yet this winter, the bike idles a little low but seems ok...
Title: Re: ST1100 Running rough at start up
Post by: saaz on July 17, 2012, 09:32:34 AM
I have had to use the choke (a bit colder here) but it does start up and run more consistently on choke after using the PM800.  The choke on the ST11 lets more fuel into the carb to run richer, so it might benefit from running a cleaner through it.  Of course I have run some special cleaner (water!!) through mine...
Title: Re: ST1100 Running rough at start up
Post by: Shaun on July 17, 2012, 06:56:04 PM
Good to hear, guys.

My bike has been running quite rough in the mornings (we have had some quite cold ones in Sydney). I will give this stuff a shot.

Cheers, Shaun
Title: Re: ST1100 Running rough at start up
Post by: Streak on July 17, 2012, 08:24:08 PM
Same here Shaun, i am going to give it a shot, see if it makes a difference.

Thank you for the good advice Gents
Title: Re: ST1100 Running rough at start up
Post by: ruSTyEB on July 18, 2012, 01:34:22 PM
Good idea I'm thinking.!
Title: Re: ST1100 Running rough at start up
Post by: Biggles on July 18, 2012, 02:08:05 PM
$17.60 this week at Supacheap Auto.     :thumbs
Title: Re: ST1100 Running rough at start up
Post by: bluehonda on July 18, 2012, 02:25:06 PM
If you order online and pick up in store you get to try it on the way home

Title: Re: ST1100 Running rough at start up
Post by: Biggles on July 18, 2012, 03:39:02 PM
If you order online and pick up in store you get to try it on the way home

only if you can estimate how much you need.  It's 500 ml for 60 litres.
The idea, presumably, is to tip the lot into a car tank after a fill.  A lot of cars take around 60 litres.
Title: Re: ST1100 Running rough at start up
Post by: alans1100 on July 18, 2012, 05:45:12 PM
If you order online and pick up in store you get to try it on the way home

only if you can estimate how much you need.  It's 500 ml for 60 litres.
The idea, presumably, is to tip the lot into a car tank after a fill.  A lot of cars take around 60 litres.

Wouldn't that be before you fill so that the fuel treatment is mixed while you fill.
Title: Re: ST1100 Running rough at start up
Post by: saaz on July 18, 2012, 05:47:00 PM
I should have asked before, but what grade fuel do you run?  The higher octane ones do make the bike a bit cold blooded on choke and it can feel a bit rough running until a bit warmer.

Also, some places get a different fuel brew in winter but I have not noticed any difference in Canberra so assume Toowomba would not get such winter fuel either.
Title: Re: ST1100 Running rough at start up
Post by: Biggles on July 25, 2012, 10:12:20 PM
I've run half a tank of Nulon and haven't had the "high revs when cold" syndrome once since.
Just filled up today (RON 91 as usual) and put 250 ml in the tank, so we'll see how that goes.
I'm just happy it has apparently fixed the problem, since I wasn't relishing doing open-heart surgery to deal with suspected atherosclerosis of the rubber arteries. 
If I pick up a bit of fuel economy, that would be nice.  No way I will detect better performance, since Ruby always went like a cut cat.
And even if the economy did improve, you wouldn't get your money back, even at the Special price of $17.60.