Great Idle But Cuts Out When Slightly Throttled!
#1
Posted 04 August 2018 - 11:46 PM
#2
Posted 05 August 2018 - 12:54 AM
Sounds like it could be very lean or still cold.
Let it warm up to near running temp and then go from there.
#3
Posted 05 August 2018 - 12:58 AM
Check the oil in the carb dashpot too
And and its a big AND is it fresh fuel...?
#4
Posted 05 August 2018 - 05:40 AM
#5
Posted 05 August 2018 - 06:20 AM
Hi,
Back off the adjusting screw on the linkage a little, not the one on the carb body. I think there should be a gap there anyway.
Then as you adjust the jet the cam can move without upsetting the idle.
Readjust the screw as required so you still have at least a 1/8" gap when you've finished.
If your cold idle is way too high with the choke full out you can back it off some more.
If you've got the correct oil in the dashpot then the piston should fall at that speed unless the dashpot or piston is worn out.
I think the test is to remove the dashpot assy, then plug up 2 small vent holes in the piston and without the spring in there the piston should hold in the dashpot and not fall out.
Hold it above the bench and be ready to catch it just in case!
Cheers
#6
Posted 05 August 2018 - 11:47 AM
It could just be a sticking Carb piston.
#7
Posted 05 August 2018 - 01:18 PM
Before you start adjusting the mixture you need to know if its wrong
Set it to a fast idle and use the dashpot lifting pin method...if it dies its lean
When the mixture is correct revs should rise slightly then settle back
If its rich then revs go up
And from before;
And and its a big AND is it fresh fuel...?
#8
Posted 05 August 2018 - 04:55 PM
#9
Posted 05 August 2018 - 05:47 PM
#10
Posted 05 August 2018 - 06:51 PM
#11
Posted 05 August 2018 - 07:50 PM
Checked the fuel delivery rate and pressure?
Checked the float bowl fuel level?
#12
Posted 05 August 2018 - 08:00 PM
#13
Posted 05 August 2018 - 10:01 PM
The pump should be able to deliver 1 ltr a min, easy way to check that is grab a 1 ltr bottle and let it pump for 30 seconds, it should end up about 1/2 full, but really, even 1/4 full will be OK.
The pressure, you need a gauge for and ideally you'd like to see around 2.5 to 4 PSI pressure at the Carb.
What type of Carb do you have? (HS or HIF)
#14
Posted 05 August 2018 - 10:20 PM
#15
Posted 05 August 2018 - 11:37 PM
Its sounding more like it's an electrical issue...
Make sure all connections coil / dizzy are clean and tight the wires to each connector are good and not green
I have had similar issues with dizzy caps tracking in the wet
to be honest it could be anything but I would start there
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