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'86 150 - Is there anything left than to clean/rebuild carbs?

R

rikclark

Member
The problem:
Stalls when attempt to engage gear. Once underway, WOT 1200/1500 rpm. Fast idle fluctuates back to 400.
Attempted fix:
Compression check OK. 108 - 110 all cylinders.
Drained carb bowls & filled with Sea Foam through fuel lines. Soaked overnight.
1gal of ring free shock treatment through engine over 3 treatments.
Engine submerged in 100 gal tub.Water line above anticav plate
New plugs. Fresh gas w/ stabilizer
All timing and idle settings to specs (motor running in tank except for advance timing set statically). Idle good. Fast idle holds steady at 1200 - 1500 rpm
Back at the ramp:
Same problem as above. No improvement.
Question:
Is "off block" carb clean and rebuild my next step? Is there something else I should check?
 
Have you checked the fuel pumps? If the 86 is similar to the later 2 strokes they are a common problem. As for the carbs, they could also be the issue and normally need lots of compressed air through the jets to be cleaned properly. Check the fuel pumps first though as this is very likely issue.
 
Check for spark on all leads.-------Spark MUST jump a gap in open air of 3/8" or more.-----These motors will sound pretty good running on 4/5 of 6 cylinders.------Check the reed valves too.
 
Thanks, I'll check spark at all cylinders. Reed valves, too. Currently recovering from spine surgery.Will report back in a couple of weeks.
 
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