1995 70hp Idle timing?

[dmoriarty51]

how do i adjust the idle timing on this?

i have an omc manual it shows a screw near the flywheel stating that it adjusts idle timing but i dont seem to have that screw on my motor nor a place where it should be

also i saw the post about setting wot timing by cranking the engine at wot, it mentions "fast start" needing to be disabled, is that something my motor has?

this motor is a console controlled setup, if that would make a difference

EDIT: is it safe to assume that when setting all the timing and syncing carbs i should have the throttle and shift cables disconnected ? and then adjust them to fit afterwards.?

 

[dmoriarty51]

Re: 1995 70hp Idle timing?

Bump

 

[Haffiman]

Re: 1995 70hp Idle timing?

Keep the cables disconnected.
Your idle stop screw is #39 (bottom right) on below diagram.
http://www.marineengine.com/parts/j...rer=Evinrude&section=Cylinder+&+Crankcase
If your temp switch on the cylinder head has 2 wires and one black/white, you have 'quick start'.
Disable by removing the one yellow/red going to power pack on starter solenoid and ground the harness end of the black/yellow to temp switch when cranking.
Remember to remove and ground the plugs ore use a spark tester when cranking at full throttle so engine does not start and run away.
If using the remote key when cranking, the remote must be in neutral, use a solid rubber band to hold the throttle lever on engine at WOT and safety switch ON. Hook up the muffs, or boat in water to not ruin the impeller.

 

[dmoriarty51]

Re: 1995 70hp Idle timing?

is that the idle stop for the carbs or for the timing? if i had the motor in front of me im sure i can figure it out. but its at my storage location.

 

[Haffiman]

Re: 1995 70hp Idle timing?

The carbs does not have an 'idle stop' adjustment.
The important is to get the carbs starting to open at the timing specified when the arrow on #47 lines up with the roller on the carb (pick up timing). From that point and down in rpm, it is all about reducing timing to get correct idle rpm.
Only two timing adjustments to be set:
1: Pick-up timing.
2: Max timing.

 

[clanton]

Re: 1995 70hp Idle timing?

Does not have Quick Start. Idle timimg 4-+1 degrees ATDC, Maximun timing 17-+ 1 degree. Page 1-36,37 OEM manual, diagram 14 and 15. No pickup timing on this engine.

 

[dmoriarty51]

Re: 1995 70hp Idle timing?

ok so

1. back off roller from cam so carbs stay shut
2. set idle timing via stop screw mentioned above 4 deg +-1 AFTER TDC, so technically speaking idle timing is in a retarded state?
3. adjust roller and or link to throttle cam to align roller and dash mark
3. using method from secret file set max timing, which per the manual is 17 deg +-1 BEFORE TDC so timing is in an advanced state?

clanton, are you saying this motor doesnt have quick start or that the procedure is only for those without? i have the stop screw in pic 15 but not the one in 14 and i do think my temp switch is 2 wire white black, will be heading to tinker after lunch can confirm then

 

[clanton]

Re: 1995 70hp Idle timing?

My mistake, this engine does have Quick Start.

 

[dmoriarty51]

Re: 1995 70hp Idle timing?

Ok verified this does have quickstart gonna make a piston stop at work tonight since no one local has one and tackle this tomorrow

Thanks for your help everyone will post my results

 

[clanton]

Re: 1995 70hp Idle timing?

Checked manuals again 95 and 96 manuals. Adjusting screws are there, in the photos. Look on BRP parts site, pull up your engine by model number, this also shows the adjusting screws.

Idle timing is retarded.

Roller is adjusted after throttle plate synchronization.

Max timing is advanced.

I only use the oem manual method for setting timing.

 

[dmoriarty51]

Re: 1995 70hp Idle timing?

Just to confirm the throttle arm should be pulled back against the idle stop screw #39 from the marine engine diagram above? This is a wildly different location than currently. Can someone post a pic of the side of there motors linkage in a nuetrL idling position

 

[clanton]

Re: 1995 70hp Idle timing?

I don`t have an engine to take photo. # 39 should be the idle stop, close to the control cable. item A photo 10 page 136. Above this screw should be WOT stop. photo 12. The idle timing screw starboard side of engine. Max timing screw port side of engine close to starter photo 15 page 137.

 

[dmoriarty51]

Re: 1995 70hp Idle timing?

ok i realigned the timing pointer, it was off a bit.

i then did link and sync on the carb linkage, with the control cables removed. bungy corded the throttle arm closed.

started engine to let it warm up. once warmed it would barely idle continually dying out. checked timing and its retarded about 8 degrees after advanced it a bit to keep it running long enough to get from the key to the timing light.

so i need to adjust that but, the stop screw isnt long enoughit appears someone tried to make this adjustment previously by adding a hose cap to the end of the screw but its not enough nor is it the right way. looking online shows me that the older models had an idle stop screw that was identical to the WOT stop screw.

as clanton stated earlier this motor SHOULD have the stop on the timer base arm, and after getting a light and taking a very close look, it did at some point. though it appears the timer base may have been replaced and the block and stop screw were not transferred with it. so i need to either get that, or get a longer stop screw to do it via the throttle arm which is probably what i will do since i should be able to get something at the hardware store.

it kinda looks like maybe someone set the timing while quickstart was engaged. I suspect the motor should be much much happier once i am done.

 

[clanton]

Re: 1995 70hp Idle timing?

The hose cap was installed by the factory. The photos I have are faded, does not scan good. You realy need an OEM manual. BRP has the best parts break down. I have looked at 94,95,96, 97 parts and service manual all look the same to me. I will keep looking for a good diagram.

 

[Haffiman]

Re: 1995 70hp Idle timing?

Do you have the idle timing adjustment screw attached to the timer base?
Se #50 and #56 below:
http://www.marineengine.com/parts/j...manufacturer=Evinrude&section=Ignition+System

 

[dmoriarty51]

Re: 1995 70hp Idle timing?

no haffiman i dont have that, it seems to have gone missing somewhere along the line either vibrated loose and lost or left off by a prior owner/mechanic. It is on my list to order, for now tho i have replaced the short screw and hose cap with a longer one and adjusted my idle timing to the 4 deg after as stated in the manual, seems to idle fine now much smoother...but possibly a bit low its about 7-800 in nuetral on muffs once warmed and off of quick start mode.


clanton i do have the omc service manual for the engine, i dont have the parts book. marineengine.com seems to have that covered quite well.

i will probably just get the correct parts for the timing stop before running the engine further, this is a fresh powerhead and id rather not leave it jerry rigged.

thank you for all your help gentlemen.

 

[Haffiman]

Re: 1995 70hp Idle timing?

Then you are 'lost'. That is the screw to set the idle timing, the other one is to set throttle lever idle stop.