1990 90 johnson

Author Message   demmer69 Visitor Posted on Friday, May 30, 2008 - 02:36 pm:    I have a 90 horse johnson 1990, have owned it since day one (actually my dads boat) and the last few years it has been getting harder to start.. I found out that the starter had a dead spot so had the redone.. Now it take forever to start either warm or cold, kinda gets worse when it is warmed up.. also to keep it idleing need to bump up the power to about 1000 rpm to keep it running ok.. I take care of it in the off season by foggin and stable, (the usual stuff) did not know if the hard starting is common or if it would be a fuel issue.. I have read places in different forums when people suggest water getting in one of the cyclinders.. any help would be great,, going up next weekend to work on it..   ikia Visitor Posted on Friday, May 30, 2008 - 05:33 pm:    You MUST start your trouble shooting with a compression test----followed by a check that you have spark that will jump a gap of 7/16" on each cylinder----Report the results.   Dale may Member Username: dalemay Post Number: 22 Registered: 10-2006 Posted on Saturday, May 31, 2008 - 03:08 pm:    I also have 1990 johnson 90 hp and am also the original owner. I have had the same problem.It won't idle below 1200 rpm's, It is hard to start after sitting for a few hours. I rebuilt the carbs and it was no help. The compression is 115 to 120 psi on all four cylinders.What happens is when you go to start it it fires then the starter disengages and it dies.The problem is water in one or two cylinders,most likley you have a bad head gasket on one head.If your compression is good on all cylinders try to start the enging and run it a while then let it idle down and stall. Quickley remove all of the spark plugs and look at them. Sometimes you will water on the ones that caused the engine to die.Also you might see steam coming out of the plug hole. If you can't tell by any of these methods pull the heads. It will be very obvious which one is leaking. the head will be very clean with almost no carbon. I have pulled mine off twice and replaced the head gasket, cleaned the head w/400 wet/dry sand paper on a piece of glass but I continue to have the same problem. I just picked a new head gasket this week. This time I am going to take the head to the machine shop and have it milled to clean it up. I think that should solve the problem.   Joe Reeves Senior Member Username: joereeves Post Number: 6100 Registered: 02-2001 Posted on Saturday, May 31, 2008 - 03:55 pm:    Dale...... (MarineEngine.com - Properly Inserted Post) Go back to the previous page and click on the "Start New Discussion" hyperlink that exists in the "Blue Border". This will allow you to enter your question/post under your own title heading which will then appear at the top of the list. As it now stands, your post is buried under the post of another member. When time permits, visit my store at: http://stores.ebay.com/Evinrude-Johnson-Outboard-Parts-etc?refid=store   demmer69 Visitor Posted on Sunday, June 01, 2008 - 02:28 pm:    that is what i am afraid of, i will be looking at it next week when i head up.. rather get it done now then be sitting in the middle of a lake wonder what the heck i am gonna do now..   Joe Reeves Senior Member Username: joereeves Post Number: 6105 Registered: 02-2001 Posted on Sunday, June 01, 2008 - 05:07 pm:    Demmer.... If you have compression and spark, remove, clean, and rebuild the carburetors. They do gradually become clogged, fouled, and gummed. Be sure to manually clean the four high speed jets that are located in the bottom center of the float chambers.... use a piece of single strand wire. When time permits, visit my eBay store at: http://stores.ebay.com/Evinrude-Johnson-Outboard-Parts-etc?refid=store   demmer69 Visitor Posted on Monday, June 02, 2008 - 02:03 am:    ok sounds good, i am going to get a compression tester this week, and then once i get up to the cabin i will be checking for spark.. if that is good i will then go to the carbs for probably some much needed tlc.. it is amazing what a little mx will do to a motor.. my brother had the same issue with running like crap, cleaned up the carbs and it runs better then when he got it..

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