question about the tan wire and timing on an OIS2000

[Jquest]

ok....I got this from Rapair.com.<br />With these new digital power packs, you disconnect the port temperature switch/sensor leads and use a jumper wire to short the tan temperature sensor wire to engine ground. <br />Then it continues...<br />Once you have verified the timing pointer using a piston stop tool (Or a<br />dial indicator), connect all spark plug wires to a spark gap tester, connect a remote starter to the engine and a timing<br />light to # 1 spark plug wire. When you crank the engine over with the remote starter and check the timing, you<br />should see the timing is set to approximately 4°-6° ATDC (After Top Dead Center). ETc....etc....<br /><br />Now....does this tan wire(at the connection) that goes to the sensor need to stay grounded while you checking the timing or is this some type of reseting for the OIS2000?<br />Also...if I have the OMC Ignition analyzer...do I need to do all of this or can I do with with just the analyzer and my manual. Which do you guys think is better??

 

[Seasport]

Re: question about the tan wire and timing on an OIS2000

Hi Jquest. When the motor gets up to temperature, the tan wire is grounded through the temperature sensor. This tells the powerpack to deactivate Quikstart at low revs. So the wire needs to be grounded all the time if you try to check the timing this way.<br /><br />I've read through the Rapair notes and I *think* this method only applies to the CDI Electronics powerpack (blue case with red sleeve). What I don't know is if these are the standard Powerpack used on these motors. Anyone else know?<br /><br />You don't need to worry about any of this if you use the analyzer. You deal with the output of the optical sensor directly before it gets to the powerpack electronics, i.e. you make sure the powerpack gets the sync signal, which initiates the spark, at the correct crankshaft position. This is all pretty straightforward.<br /><br />The analyzers are expensive ($300+) but I have designed a DIY analyzer which can be made for a lot less. A few people are building these at the moment. Email me at Seasport1@hotmail.com if you are interested. Requires basic electronics skills.<br /><br />You can of course check the timing with a timing light by hanging off the back of the boat with the motor at full revs (in gear of course). You have to be careful that the timing light doesn't interfere with the optical sensor - but it worked for me. You can also do this with the boat still on the trailer.

 

[Jquest]

Re: question about the tan wire and timing on an OIS2000

Thx for the info and appreciate the offer, but I got mine on ebay for 60.00 beans. <br />thx again...

 

[Seasport]

Re: question about the tan wire and timing on an OIS2000

Not bad - 2nd hand?

 

[Walker]

Re: question about the tan wire and timing on an OIS2000

I think you're right Seasport. My 1994 120 with factory OMC powerpack uses the black/white wire for the quickstart.

 

[Jquest]

Re: question about the tan wire and timing on an OIS2000

Originally posted by Seasport:<br /> Not bad - 2nd hand?

yeah..it was from a dealer who sold everything to one of those liquidation groups. I got the whole kit including probes, matching harnesses and carrying case. Can't complain. Just have to cruise by ebay once a while to see what goodies are under priced.

 

[Seasport]

Re: question about the tan wire and timing on an OIS2000

Good work Jquest! Your analyzer will also do the dynamic test of the optical sensor (counts pulses from the sensor as the motor turns).<br /><br />Thanks for your comment Walker. It may be that the Rapair technique works with any powerpack if you ground the temp sensor wire. However, the Powerpack also activates Quikstart for the first 5s of every start - hot or cold. So how can you be sure that it has been deactivated. Wait 5s maybe? At least with the analyzer you can be sure the Powerpack isn't making life hard for you.