Aquasport Mechanicals - things that need a wrench, screwdriver or multimeter => Props => Topic started by: charliemyjak on March 29, 2017, 08:36:32 PM
Title: 1981 20ccp 1994 johnson 225 ocean Runner
Post by: charliemyjak on March 29, 2017, 08:36:32 PM
:think: Any one have an idea what prop should I start out with ball park, It originally had 14"x 17" stiletto SS I'm turning around 4500 rpm at about 43 mph GPS.Engine calls calls for around 5500 wide open would a 15" x 21" get me in the ball park. any Ideas would be appreciated thanks.
Title: Re: 1981 20ccp 1994 johnson 225 ocean Runner
Post by: wingtime on March 29, 2017, 11:25:37 PM
Is the 4500 full wot? Also how accurate is your tach?
Title: Re: 1981 20ccp 1994 johnson 225 ocean Runner
Post by: charliemyjak on March 30, 2017, 08:29:46 AM
Yes wot put another tach on also to double check. motor runs great bring motor on plane with ease just feel should be getting more from her
Title: Re: 1981 20ccp 1994 johnson 225 ocean Runner
Post by: wingtime on March 30, 2017, 10:16:19 AM
Good solid motor. I'd check to make sure you are getting spark in all cylinders. I had that problem on mine. Also when were the carbs cleaned last? A dirty carb could cause a lean cylinder (not good on a two stroke). I'd start pulling plugs to see how they look. New plugs are cheap. Use the plug they recommend (QL78YC I think)not a NGK.
Here is a video of testing the spark on my 225 Ocean pro
Title: Re: 1981 20ccp 1994 johnson 225 ocean Runner
Post by: charliemyjak on March 30, 2017, 11:28:08 AM
I took all carbs apart cleaned checked float levels. Also put new plugs ran it pulled all plugs looked good except #5 didn't appear to have the discoloration as the rest. Compression is good on all cylinders changed coil and wire on that cylinder started on hose actually sounded more consistent. Timing is good could power pack be going bad. Also in water what should idle be at . I'm about 620 -630 in gear is that too low does not stall out or anything runs great. Thanks for any ideas Wingtime
Title: Re: 1981 20ccp 1994 johnson 225 ocean Runner
Post by: wingtime on March 31, 2017, 08:15:53 AM
Idle sounds good. Was the #5 plug wet and oily? Could be a powerpack going bad. I replaced mine with a CDI unit. Runs and starts much better than the original power pack.
Title: Re: 1981 20ccp 1994 johnson 225 ocean Runner
Post by: charliemyjak on March 31, 2017, 09:32:05 AM
Yes Wingtime wet and oily but ceramic is not as brown as all the others. Also wanted to ask have vro oil disconnected mix 50:1 been using johnson oil the purple oil non synthetic like $20.00 a gallon looks to be like the old oil Tcw-3 only smoke on start up that oil should be fine do you think?.How can I upload pictures of boat purchased august of 2016 from guy in Jacksonville Fl.Guy Had boat since 1991 Iam from what dmv and titles third owner of the boat seems to be pretty much original except for T-Top. The color is Tahitian Tan and is 1981 Hin Tag #ASPP0663M81H want to post pics The name of boat is called Tahitian Rose with a big red rose painted between Tahitian and Rose. The original owner's wife was named Rose he had boat for one year then she passed away and he never used it again and finally sold it in 1991 to the guy I purchased from. The boat came with a Rolls Axle trailer that he had them make for it too. Thanks
Title: Re: 1981 20ccp 1994 johnson 225 ocean Runner
Post by: wingtime on March 31, 2017, 02:10:30 PM
So the VRO is disconnected or do you want to disconnect it? To be honest despite the old timers rumors the VRO system is actually a very reliable system. You use by far more oil premixing then running the VRO. Usually most people do not disconnect the VRO systems properly. They usually disconnect all the alarm circuits. This is not good because you will not know if you get a overheat alarm (much more likely than a VRO failure).
Title: Re: 1981 20ccp 1994 johnson 225 ocean Runner
Post by: Capt. Bob on March 31, 2017, 02:59:24 PM