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Billmc
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High idle
04/24/17 at 08:36:22
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It's starting to warm up here on the 3rd coast and that's making it easier to start the old girl.
On the other hand, after a "spirited" 30 mile ride yesterday, coming to a stop light the idle settled in at 2,000 rpms and would not drop any lower. Blipped the throttle a couple of times but no change.
I have modified nothing over the winter and the ride last week did not change the normal idle she has had since the rebuild last summer of 900-1,000 rpm's.

Any ideas on what is going on and what I need to do to fix it??
  

1987 R65 Silver
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Billmc
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Re: High idle
Reply #1 - 04/24/17 at 15:53:06
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Anyone have any thoughts to share?
  

1987 R65 Silver
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Tony Smith
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Re: High idle
Reply #2 - 04/24/17 at 16:00:24
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Billmc wrote on 04/24/17 at 08:36:22:
It's starting to warm up here on the 3rd coast and that's making it easier to start the old girl.
On the other hand, after a "spirited" 30 mile ride yesterday, coming to a stop light the idle settled in at 2,000 rpms and would not drop any lower. Blipped the throttle a couple of times but no change.
I have modified nothing over the winter and the ride last week did not change the normal idle she has had since the rebuild last summer of 900-1,000 rpm's.

Any ideas on what is going on and what I need to do to fix it??


Could be a few things -

I'd start by looking to see if the advance/retard mechanism in the beancan is  free of not - its a good excuse to clean and lubricate this often neglected and very important part even if it is free.

Next I'd be looking at the intake rubber "trumpets" that connect the carbs to the heads - if they are cracked and "old" looking replace them (by all means buy a length of the right sized rubber tube and cut to length, but make sure that the tube you buy is heat rated and is roughly as "stiff"  as the originals, it is very, very embarrassing to have to do an emergency refit of your carbs by the side of the road (involving half a roll of electrical tape) when the couple of dollars saved in buying a length of tube and cutting comes back to haunt you in the form of a backfire and your carb making a strike for freedom, retained only by the throttle and choke cables Sad

Next did you remember to put the vacuum port screws back in after you most recent tune? Fun fact, you will never buy those 2.5 (or is it 3) millimetre screws if away from home. But a short length of 6mm internal diameter fuel hose or vacuum hose will slip over the outside of the vacuum port and you can then put a 6mm bolt or even a suitable self tapping screw into the hose to get you back on the road.

There are many other possible causes - like the enrichening assembly screws coming loose, air getting past a worn throttle butterfly spindle, but I would look at the first three before dooming myself to spending a lot of money.
  

1978 R100RS| 1984 R65 | 1984 XT350 | 1992 KLE500 | 2002 R1150GSA
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Billmc
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Re: High idle
Reply #3 - 04/25/17 at 11:33:43
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Thanks Tony I will check those 1st and report back.
  

1987 R65 Silver
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Barry
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Re: High idle
Reply #4 - 04/25/17 at 13:09:53
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Tony Smith wrote on 04/24/17 at 16:00:24:
Next did you remember to put the vacuum port screws back in after you most recent tune? Fun fact, you will never buy those 2.5 (or is it 3) millimetre screws if away from home.



Keep going Tony it was 3.5 x 0.6 

In the UK there are 50+ screws of that size in every house. It's the same thread used to secure light switches and power outlets. They are not flat head screws but they'll do as a temporary substitute in a pinch as I discovered when my originals got lost for a while in the garage ether.
  

Barry Cheshire, England 79 R45
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Lordcargo
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Re: High idle
Reply #5 - 04/26/17 at 12:57:08
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Just a thought here because I am no gear head but learning. When I put in new points I discovered the old ones were set way low. When adjusted properly my idle (after warm up) was in your 2000 range. I simple re-adjusted my idle speed and happy since.
  

1979 R65
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