You sir hit the nail on the heads. So after a couple trips it's done decent. Still has some issue just falling on its face when you punch it from idle. I decided to recheck compression with a new tester. Got right at 115 on each cylinder. Thought the slight increase was interesting but I...
Little update. Had time this week to get the carbs back on. Fired it up on water horns and its back to idling good on all 4 again. Will take it to the lake this weekend to test in the water as again.
Well I've found some OEM kits local. And yeah I can tell it's picky. For a moment yesterday it was just about right. The off idle was decent and the idle was steady.
Maybe the plugs were crappy and undersized or maybe I'm just not knocking them in hard enough to expand them fully.
On the topic of float height. I read the idea is just to get the end of the float opposite the needle just above level with the body of the carb correct?
And what was the sealer recommended for the welch plugs? Recall reading about it but can't seem to find that post again
Well I have noticed there throttle shafts do have some play. I'm gonna source some good rebuild kits. Get it all back together and then I heard someone say to try some axle grease around the shafts to help determine if they are causing an issue.
I have no reason to pull the flywheel. Spark is strong and all indicators point towards a fuel issue. Like I say it was running pretty good. Id say the issue on the water was that Welch plug getting loose then coming un-seated again. I wouldn't think they were still making OEM kits for the...
Well the problem was pretty simple. Welch plug didn't stay put. Was hanging out the hole. I used a kit supplied with the boat. Honestly didn't like it. What kits are everyone using? And could I fit this engine with another v4s carbs that are adjustable idle mixture?
Kinda frustrating I know it's a fuel issue. the carbs are "clean". All circuits blow through fine with carb cleaner. On the lake when it was running on just the bottom two the choke for a second would cause the top two to pick up and when I got it home and ran it on the horns it did it again...
Going to wait till it gets a little darker test spark gap. But it seems like it's isolated to the upper two cylinders
Update. Spark on all 4 coils jumps 1/2" pretty easily.
Well I took it to the lake and initially everything seemed pretty good. Idle was decent still hiccups a little till it was warm. Transition from idle to throttle just fine. Was pretty happy with it then it just did a complete 180. Didn't want to idle didn't want to go from idle to wide open...
Oh i know. My Buddy went through 3 power heads before he found one decent one.
I think i may already have it fixed however. And I THINK it was due to crappy carb bowl gaskets. I took it back apart (top carb). Popped those welch plugs out and those little holes for the idle circuit looked...
I've used two testers. When I bought the boat The sellers tester read 110 across the board every cylinder was spot on the same reading(nicer gauge. easily readable) . The tester i used just yesterday is one thats cheaper has 90psi then next number on the gauge is 120. The needle lands right...
Picked up a boat recently with this 78 Johnson 140. It had a poor idle. Pops out the exhaust and stumbles. Eventually dies. Also most of the time it hates transitioning from idle to WOT. Most of time just stalling when coming off idle under load. When it does make it through it does fine at...
