Chrysler 75hp Will not start will backfire.

[JDA45]

Chrysler 75hp model#757HC.Will not start only backfires.Plugs will fire outside engine.How do I check spark plug wires for correct order.And can I check electronic ignition without speical equipment.Ignition model (Rapaired 523301-1).What is the correct timming for this motor.Spark plug fire seems weak. What can I check to improve fire.Tried coil off another engine a 50hp chrysler and it didnt help. Please give any suggestions to what I should try.I want as many replies as possible.Thanks John Allen<br />E-Mail me JDA45@msn.com

 

[christhefish]

Re: Chrysler 75hp Will not start will backfire.

The wire under the dis cap closes to the motor is #1 go clockwise #2 #3 Top cyclinder is #1then 2 3. For the timming part Check the disturbutor belt pully for a mark. Line it up with the one on the flywheel hope it helps<br /><br />Chris

 

[JDA45]

Re: Chrysler 75hp Will not start will backfire.

Thanks Christthefish.<br />Come on everybody I need more suggestions on things to check or try.How can I test ignition box without speical tools.What else could be wrong.Give me your Ideas.Post here or E-mail me.<br />JDA45@msn.com Really anything will help.

 

[Yepblaze]

Re: Chrysler 75hp Will not start will backfire.

MARINE IGNITION SYSTEMS

 

[jim dozier]

Re: Chrysler 75hp Will not start will backfire.

What is the history on this engine. We need more info. When was the last time the engine ran right and what has been done to it since?

 

[JDA45]

Re: Chrysler 75hp Will not start will backfire.

When I bought it didnt run so I dont know much about it.The man I got it from had traded a small fishing boat for it.But he couldnt make it run either.Well he didnt try very hard and never bought any parts for it.The man he got it from said it had been siting a long time.It was his wifes boat and she had died and he couldnt stand to use it anymore.

 

[BF]

Re: Chrysler 75hp Will not start will backfire.

are you sure it's an ignition problem? Maybe the carb's loading the crankcase with gas. Super rich mixture could foul plugs and look like weak spark (??).<br /><br />Kinda guessin' here, but it's a thought. I had a snowmobile with similar problem in the past, was a stuck float.<br /><br />Brent

 

[427hawk]

Re: Chrysler 75hp Will not start will backfire.

flywheel key ,timing ????

 

[JDA45]

Re: Chrysler 75hp Will not start will backfire.

I tried checking plugs and they are some what dry.<br />So I dont think thats it.And have checked the flywheel key and it is ok.But thanks for all the Ideas.Please keep them comming.You guys are great!

 

[Terry H]

Re: Chrysler 75hp Will not start will backfire.

JDA...I would suggest that you definately get a manual that covers that motor, a mid to late 70's model...I think the seloc book has a reasonable troubleshooting section for the ignition...if you have proper spark, compression, and fuel, you need to make sure the spark is firing at the right time and there's enough of it...just a Thought

 

[72INVADER90HP]

Re: Chrysler 75hp Will not start will backfire.

Try a compression check. does it back fire through carbs or the exaust.

 

[72INVADER90HP]

Re: Chrysler 75hp Will not start will backfire.

I have a manuel and am looking at Backfires and the only thing it say to check is<br /><br />1.cracked spark plug insulator<br />2.carbon path on the distributer<br />3.crossed spark plug wires.<br />4.improper ignition timing

 

[Terry H]

Re: Chrysler 75hp Will not start will backfire.

crossed plug wires is a distinct possibility for this scenario...just a Thought

 

[JDA45]

Re: Chrysler 75hp Will not start will backfire.

Thanks to all of you who have replied to my call for help! Iam still waiting for the distributor belt I broke to arrive so I can try some of the things you have suggested.Please keep the Ideas comming .With your help Iam starting to feel good about fixing this motor.Also guys the floor of the boat has a couple of soft spots and one that has broke through.I cant see the damage for the carpet.I do plan to tear out carpet and repair floor.My question is do I remove old floor or put new plywood over it? And what do I need to use to repair it? Remember Im on a tight budget.

 

[Go_Rilla]

how do you set the belt on the distributor

 

[Frank Acampora]

Please start your own thread explaining what the problem is. It is against forum rules to revive a thread more than 12 years old.