Good Morning, I'm new to the Forum but I've been scouring through posts trying to find suggestions. I picked up a 92' Evinrude 8HP a few months ago and have which had a hard starting issue but seemed to run and idle great (in test tank) once finally running. After playing with it to diagnose the problem, I now have the same hard start issue and it's not idling properly either. Originally, it would require many many pulls to get it running, a little shorter after pulling the plugs and cleaning with a wire brush and heating with a small torch to dry them off. Always, and still do come out oily and wet after it has been running. Motor will not re-start no mater how long it has run.
I'll list what I have done, and the results so far.
- Performed simple spark check (ground plug to block method) - Spark on Both Cylinders
- Tried adjusting mixture screw. Initially had to turn in about 5-6 turns to seat (very Rich). Started with 1.5 turns out, then 2.5 (as per service manual). Doesn't seem to make any difference in either direction based on these starting points.
- Adjusted Throttle Cable and possibly fixed inoperable idle speed adjustment in tiller
- Removed and Cleaned Carb (without kit) - No Change
- Replaced Spark Plugs - No Change
- Replaced Power Pack/Ignition Module (UFI Ignition) based on Marine Mechanic/Friend suggestion - No Change
- Performed Compression Test - 70-75psi on both cylinders
- Performed Proper Spark Gap Test - Good 7/16"
- Performed Decarb using 1 can of Deep Creep - No Change
Notes:
- Somewhere in the process of readjusting the throttle cable and cleaning the carb, I found it would only stay running at higher RPM (guessing somewhere around what I presume the START speed (sorry markings are gone on tiller), any lower and it died, but seemed to still rev up good.
- I have been adjusting the mixture screw throughout the process and have now opened the screw back to around the 5-6 turn range. It now seems to idle at a much lower RPM but not nearly as low as it originally did (would still idle with throttle control closed).
- Above note leads me to suspect some sort of air leak causing a lean condition thus requiring a rich mixture to compensate, however I still get oily/wet fouled plugs after it runs no matter where the mix screw is set.
- Compression, although even, seems low to me - could this be the cause of my no/hard start issue?
- Power Pack, do I have the correct air gap between flywheel. I don't have the proper spacing ring so I installed based on alternative procedure in service manual by using approx .025" of masking tape on magnets and looking for marks from components. How critical/sensitive is this air-gap and could it be causing my issue still?
- In order to rule out carb issue, I have dissassembled and very thoroughly cleaned the carb but waiting on repair kit for assembly. I did notice the little mesh screen on the carb above the bowl was partially plugged by something, possibly excess Seafoam as it seemed like a liquid IIRC.
- Although seems OK, I will be rebuilding the fuel pump (kit also on order) just to rule out any weird issue. Have not had any fuel starvation issue while running and primer stays hard.
- Fuel Tank and Line are brand new, with about 1 week old gas. Fuel pump supply line was leaking at fitting (loose connection) but has since been repaired. Lines will be replaced but are not leaking, and I see no evidence in the carb of line breakdown.
Thanks for reading, sorry for the long post, just trying to be as thorough as I can. I look forward to any suggestions you may have.
I'll list what I have done, and the results so far.
- Performed simple spark check (ground plug to block method) - Spark on Both Cylinders
- Tried adjusting mixture screw. Initially had to turn in about 5-6 turns to seat (very Rich). Started with 1.5 turns out, then 2.5 (as per service manual). Doesn't seem to make any difference in either direction based on these starting points.
- Adjusted Throttle Cable and possibly fixed inoperable idle speed adjustment in tiller
- Removed and Cleaned Carb (without kit) - No Change
- Replaced Spark Plugs - No Change
- Replaced Power Pack/Ignition Module (UFI Ignition) based on Marine Mechanic/Friend suggestion - No Change
- Performed Compression Test - 70-75psi on both cylinders
- Performed Proper Spark Gap Test - Good 7/16"
- Performed Decarb using 1 can of Deep Creep - No Change
Notes:
- Somewhere in the process of readjusting the throttle cable and cleaning the carb, I found it would only stay running at higher RPM (guessing somewhere around what I presume the START speed (sorry markings are gone on tiller), any lower and it died, but seemed to still rev up good.
- I have been adjusting the mixture screw throughout the process and have now opened the screw back to around the 5-6 turn range. It now seems to idle at a much lower RPM but not nearly as low as it originally did (would still idle with throttle control closed).
- Above note leads me to suspect some sort of air leak causing a lean condition thus requiring a rich mixture to compensate, however I still get oily/wet fouled plugs after it runs no matter where the mix screw is set.
- Compression, although even, seems low to me - could this be the cause of my no/hard start issue?
- Power Pack, do I have the correct air gap between flywheel. I don't have the proper spacing ring so I installed based on alternative procedure in service manual by using approx .025" of masking tape on magnets and looking for marks from components. How critical/sensitive is this air-gap and could it be causing my issue still?
- In order to rule out carb issue, I have dissassembled and very thoroughly cleaned the carb but waiting on repair kit for assembly. I did notice the little mesh screen on the carb above the bowl was partially plugged by something, possibly excess Seafoam as it seemed like a liquid IIRC.
- Although seems OK, I will be rebuilding the fuel pump (kit also on order) just to rule out any weird issue. Have not had any fuel starvation issue while running and primer stays hard.
- Fuel Tank and Line are brand new, with about 1 week old gas. Fuel pump supply line was leaking at fitting (loose connection) but has since been repaired. Lines will be replaced but are not leaking, and I see no evidence in the carb of line breakdown.
Thanks for reading, sorry for the long post, just trying to be as thorough as I can. I look forward to any suggestions you may have.