Author Topic: rough idle in current freezing weather  (Read 1676 times)

jimv50

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rough idle in current freezing weather
« on: February 15, 2016, 09:13:20 PM »
Can't find anything online but do these bikes run rough when idling in the current freezing weather?

Offline Norniron

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Re: rough idle in current freezing weather
« Reply #1 on: February 15, 2016, 11:25:56 PM »
Are you using pods or original filter and airbox?
1977 400 cafe
1972 500/4
2013 triumph STR675

jimv50

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Re: rough idle in current freezing weather
« Reply #2 on: February 16, 2016, 04:28:27 PM »
All original set up,no 'enhancements', correct good condition plugs etc,runs alright when thoroughly warmed up during a good run.
Just thought the bikes might be  sensitive to the cold.
I've screwed the idle up to 1300 rpm just to stop bogging down at the lights

Offline hairygit

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Re: rough idle in current freezing weather
« Reply #3 on: February 16, 2016, 04:31:14 PM »
One possibility is water absorbed by the ethanol in the petrol freezing and partly obstructing a jet due to the inrush of already very cold air.
If it's got tits or wheels, it's hassle, if it's got both, RUN!!!

jimv50

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Re: rough idle in current freezing weather
« Reply #4 on: February 16, 2016, 05:28:06 PM »
Petrol all good, all flushed through after recent fuel tap debacle, all carb bowls drained and petrol looked good.
A thorough spray of carb cleaner will have to be done just in case.
New brass and steel feeler gauges ordered just now to give a bit of  tune up which I hope will help.
The more I do to it the less likely I'll trade it in against a Ducati Monster I've got my eye on.
« Last Edit: February 18, 2016, 02:48:51 PM by jimv50 »

jimv50

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Re: rough idle in current freezing weather
« Reply #5 on: February 18, 2016, 02:52:23 PM »
RS tools delivered new brass feeler gauges today and air gap adjusted from previous 0.85mm gap to 0.35mm.
Certainly started up on the choke better and ran a bit smoother, will have to wait for another day to see what it's like on a run.

Offline Bryanj

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Re: rough idle in current freezing weather
« Reply #6 on: February 18, 2016, 05:20:21 PM »
Why brass feeler gauges? what's wrong with standard steel ones

jimv50

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Re: rough idle in current freezing weather
« Reply #7 on: February 18, 2016, 08:24:52 PM »
Nearly all the guidance on measuring the air gap in electronic ignition systems told me to use the non-magnetic feeler gauges.
I certainly don't know the science behind what may go wrong but for the sake of a few Euro I wasn't taking the risk of either shorting something out or just plain not measuring the gap correctly, and I get another tool in the bike tools box  ;D

PS where in Glos are you, I was born in Thornbury
« Last Edit: February 21, 2016, 07:10:02 PM by jimv50 »

Offline totty

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Re: rough idle in current freezing weather
« Reply #8 on: February 18, 2016, 09:25:49 PM »
Apparently some sensors can be knacked by magnetisng them with feeler gauges. I looked it up when I wondered why I had one brass feeler in a set.

Offline Bryanj

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Re: rough idle in current freezing weather
« Reply #9 on: February 19, 2016, 07:36:58 AM »
Didn't know you had electronic ign, Im just south of glos near junct 12

jimv50

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Re: rough idle in current freezing weather
« Reply #10 on: February 19, 2016, 10:20:30 AM »
What was I worrying about? Honda manual shows someone stabbing away with a screwdriver at the pulse generator.
And it seems the bike has 'transistorised' ignition rather than electronic, how things move on..