1970 7 hp Chrysler Model 703 Not staying running

[RedneckCatter]

Hello again,

Once again ive picked up a small outboard and am having a couple minor issues. I got it on the presumption it just needed a coil starter. No biggie. I got that all in and working. My questions are the small choke knob on the left. I can get the motor running for a while with it pulled out. When i start pushing it in the RPMs increase to the point it sputters and kicks to the right a bit im assuming is a backfire. I pulled the plugs and look good but i can not find the GAP info anywhere. I am going to gap them to be shure and if no change pop the magnito and check the condensors. What would cause it to sputter like a backfire with the carb wide open? Maybe you need more info from me but not sure what so feel free to ask away if needed. Im constantly reading these forums. I should Home page them lol. And i used a spark tester and was getting spark on both plugs just by hand turning the flywheel.

 

[RedneckCatter]

Re: 1970 7 hp Chrysler Model 703 Not staying running

Ok i can get it to stay running and running fast and smooth with choke in now but when i throttle down it still gives a sputter. like a pause and it slightly kicks to the right. im assuming the hickup is momentarily interupting the system and the jolt to the right is the system rotating clockwise when it stutters. Any idea what would cause this stutter like a small backfire.

 

[RedneckCatter]

Re: 1970 7 hp Chrysler Model 703 Not staying running

also the key under the flywheel is great, gaps look good but not sure what they are supposed to be at but i cleaned them. replaced a condensor that was good but starting to crack. new plugs and look good. when it backfires i can see the exhaust sputter and the pee holes on it pause a second as well. hope this new info helps some too.

 

[jerryjerry05]

Re: 1970 7 hp Chrysler Model 703 Not staying running

Top front of the carb is the air screw.GENTLY in till it touches the bottom.Then out 1 full turn.
Clean the carb.Seperate tank?Yes? Change the pump diaphram.When the carb is off check the reeds.J

 

[RedneckCatter]

Re: 1970 7 hp Chrysler Model 703 Not staying running

Thank you going to go try it now. Ill let you know and anyone by chane know the gap for plugs and points on this model? Cant find it anywhere yet.

 

[RedneckCatter]

Re: 1970 7 hp Chrysler Model 703 Not staying running

well that didnt change it so guess im going to do what it didnt want to do...take the recoil starter out to get to the carb and remove it and see if its fouled up. Thats about the only thing i havnt done yet on it. Starts just fine and runs WOT good. Lower throttle down and thats when it starts hickuping every five seconds or so.uhg lol.

 

[jerryjerry05]

Re: 1970 7 hp Chrysler Model 703 Not staying running

Check gas for water??

 

[Ross72]

Re: 1970 7 hp Chrysler Model 703 Not staying running

Couldn't find anything for a 7 hp, but the 6 hp is listed as plugs at .030 and points at .020. That's pretty standard for most small outboards up to about 40 hp. Hope this helps.

 

[RedneckCatter]

Re: 1970 7 hp Chrysler Model 703 Not staying running

Thank you for the info in gaps. I found manuals for 9.2 hp and the 20 hp models and components almost identical and had a lot of useful info. Luckily the guy that sold it to me also threw in a second complete motor identical he got for parts. Its in very nice condition too so im using it as my test for tearing things apart. All its components look good. Extra prop and all. I took the carb off that one and completely cleaned it and rebuilt it. Tomorrow ill pull the recoil starter out and just swap carbs and see if it fixes it. If so i can tear the other carb apart and see what was in it. This model is nice because i can test it without putting the recoil starter back in as it has the starter slot on top i just wrap the cord around and pull. Its actually easier than the normal starter lol.Im hoping its just blockage in the carb leaning it out. Ill make sure the gaps are correct as well. Ill keep this updated if i find the sollution. Its almost impossible to find any info specifically on the Chrysler 7 hp model 703. Someone may find it useful.

 

[RedneckCatter]

Re: 1970 7 hp Chrysler Model 703 Not staying running

Alright got it running perfect so i thought id drop another post letting people know the resolution. I first of all have all the manuals for chryslers from 2 hp to 20 hp and a few 75 hp and 115 hp. By manually editing some url's i was able to get them directly from Chrysler's site lol. I took the carberator off the spare motor and completely rebuilt and cleaned everything on it. I then set the low speed needle to 1 turn out. Pulled the old carb off the motor i was working on and put the rebuilt one on. Here was where the manual came in handy for setting the throttle pick up. Its easier to do with the magneto off so i suggest taking it off. While it was off i double checked the gaps to points. The timing so i call it was off a little on the throttle pickup so i adjusted it per the manual. Fired it up and was still having the backfire. I slowly turned the low speed needle open to allow more air. Give it time to adjust to the new setting. Ended up being at about 1 extra turn out and it quit hiccuping and runs smooth now. Starts first pull. Idles great, shifts great and throttles to WOT smoothly with no hesitation. Now having the low speed needle open to 2 turns may change when i put new gas in. My oil mix may be off a hair. but thats easy to adjust. Once again thank you for the help.

 

[RedneckCatter]

Re: 1970 7 hp Chrysler Model 703 Not staying running

Also i had tried to adjust the needle on the other carb to no effect so it may be clogged. gives me something to work on another time.

 

[RedneckCatter]

Re: 1970 7 hp Chrysler Model 703 Not staying running

If anyone would like a copy of the PDF's for the chrysler outboards find me on Facebook. Jesse J Smith. Sioux City, IA. Profile pic has me in my Army class A's next to my wife in her wedding dress.