Re: 85 hp force hard starting AFTER WARM UP
OK, I don't claim to be an expert, and they will chime in for sure, but its late and I'm probably the only one up. I've just spent 2 months working on the same motor with some of the same problems so here goes. If you know some of this just skip it.
1. Get a factory or Clymer manual. you will be glad you did.
Cold start procedure is to pump fuel bulb until hard. Disengage the shifter on your control, either by button, switch, whatever, and push handle forward. You won't get wide open throttle, this should throttle the engine between 1500-2000 RPMs. Push the key in and turn to run, you should here the choke engage (cowling off you should see it engage). With key pushed in turn over motor and it should crank pretty quickly.
Now mine, even with the choke, would not start without spraying mix directly into carbs until I started playing with the choke. Make sure the choke butterflys are closing FULLY. You will have to remove the air box on the carbs by removing the 6 screws holding it on to see the butterflys. Mine looked like they were closing fully, maybe just the SLIGHTEST crack at the bottom. I loosened the choke solenoid and slid it down in its bracket just slightly (to pull the rod further) and the small crack disappeared and it has started everytime with maybe two rotations of the motor, even in 40 degree weather.
If that all checks out you might need to remove and clean the carbs making sure there is no trash in them. With fuel in the carbs, primer bulb pumped up, and choke closing fully it should crank quickly.
If you haven't already done so, replace the fuel line from the tank to the fuel pump on the motor. Replace the primer bulb while you are at it. Lastly replace the fuel pump diaphram with a fuel pump rebuild kit. All that's cheap and there's no reason not to do so.
I'm assuming the compression and spark are good since you say it runs well WOT. Check your plugs making sure they all look ok. They should have a little carbon and a little gas on them. If they are tan burnt looking you may be a little lean. I was told years ago that there were no cold natured engine, just lean ones. If they look normal for a 2 stroke then you are ok, if not....On the front of your carbs, above the butterflys, there will be a screw. This is your idle mixture screw. Slowly turn it in, counting the turns, until it is lightly seated, then back back out to what it was. Factory setting was 1 1/4 turns out, and is a good place to start. Read here you never want to go any less than 3/4 turns out.
Lastly, look at the topish of the forum page, you will see a blue tool bar. on the right side, second from the end you will see search. Click search, then click advanced search. In the search page type in "85 start" or "85 starting". Click Topics only under that. On the right scroll down and click "force/chrysler forum", and at the bottom click search. That should bring up lots of post, with good answers, while you are waiting on an expert to chime in here. Then when you are bored just type in "85" in the search on the force forum. Lots of good info there.
Hope some of this helps.
James
