CamL
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Brand New Briggs & Stratton 725Exi won't start, pull is very hard.
Just received a Briggs and Stratton 725Exi motor from Jacks, installed it on my Power Trimmer, adding oil and gas and then pulled the pull cord and it was very hard to pull. In investigating B&S motors, the B&S technicians and engineers say there are two types of pulls, a granny pull and a muscle pull. They design their engines to start with a granny pull. My new engine is a muscle pull and the motor does not start and doesn't even sound like it wants to start. Not sure what to do next, any ideas?
post edited by CamL - 2021/06/24 21:55:23
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Roy
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Re: Brand New Briggs & Stratton EXI725 won't start, pull is very hard.
2021/06/24 20:32:28
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Is it equipped with a blade brake for lawnmower applications?
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CamL
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Re: Brand New Briggs & Stratton EXI725 won't start, pull is very hard.
2021/06/24 22:38:58
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No. It is a brand new motor which I just purchased here at Jack's, to replace a broken model of the same type on a DR Trimmer Mower. Swap was pretty easy. Issue is using the manual start pull cord which takes a lot of effort to pull versus the B&S claim that their engines are easy to pull, so easy a "Granny" can do it. This one is not like that.
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Roy
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Re: Brand New Briggs & Stratton EXI725 won't start, pull is very hard.
2021/06/24 23:29:29
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What is the model and type number?
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CamL
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Re: Brand New Briggs & Stratton EXI725 won't start, pull is very hard.
2021/06/24 23:40:27
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Model # 104M020197F1
I don't see a "type"
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kshansen
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Re: Brand New Briggs & Stratton EXI725 won't start, pull is very hard.
2021/06/25 07:58:30
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CamL
Model # 104M020197F1
I don't see a "type"
Guess first thing I would do is to remove the spark plug and see if it turns over nice and free and easy with plug out. If it does then if it is an over head valve engine pull valve cover and check valve adjustments. Could be a simple as the valve that works the decompression is out of adjustment. Other things I might do if there but at least those would be a start, no pun intended!
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Roy
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Re: Brand New Briggs & Stratton EXI725 won't start, pull is very hard.
2021/06/25 12:05:48
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According to the IPL that engine does have a brake so is not the correct one for your application. You will also find it has the light aluminum flywheel which needs to be replaced with the heavy cast iron version. Talk to Jacks.
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kshansen
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Re: Brand New Briggs & Stratton EXI725 won't start, pull is very hard.
2021/06/25 14:33:01
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That possibility, flywheel brake, was one of the things I was thinking about when I suggested pulling the start cord with plug out. Plug out would eliminate compression causing the hard pull! As for the lack of cast iron flywheel I would be wondering if that is needed could the original motor have the one needed? To be clear I'm not saying it will work but posting that for others to comment on. I think the best thing would be to post the full number for the original motor and the one for the new motor to make comparisons easier. Roy
According to the IPL that engine does have a brake so is not the correct one for your application. You will also find it has the light aluminum flywheel which needs to be replaced with the heavy cast iron version. Talk to Jacks.
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CamL
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Re: Brand New Briggs & Stratton EXI725 won't start, pull is very hard.
2021/06/25 23:31:50
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Update: Thank you for the suggestions. I pulled the plug and it was still hard to pull. So I removed the cover and indeed the flywheel brake was engaged. I removed the spring (the brake is not needed as you mentioned in my application) and that freed up the engine pull. It still has not started but I think I am on the path to resolution. I will check the spark next and will update with the results of that. Thanks again for the suggestions. I appreciate the encouragement to continue to resolve this.
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AVB
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Re: Brand New Briggs & Stratton EXI725 won't start, pull is very hard.
2021/06/26 06:25:10
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CamL
Update: Thank you for the suggestions. I pulled the plug and it was still hard to pull. So I removed the cover and indeed the flywheel brake was engaged. I removed the spring (the brake is not needed as you mentioned in my application) and that freed up the engine pull. It still has not started but I think I am on the path to resolution. I will check the spark next and will update with the results of that. Thanks again for the suggestions. I appreciate the encouragement to continue to resolve this.
You need to fully cripple the brake as it has the kill switch for the magneto incorporated. Tie it in the fully released position. Just note will need an alternate way of killing the engine. Otherwords a kill switch otherwise ran to the magneto kill terminal. Normally I install a switch in the throttle control on the engine but this engine is a fixed speed version so that is not an option.
post edited by AVB - 2021/06/26 06:28:52
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CamL
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Re: Brand New Briggs & Stratton EXI725 won't start, pull is very hard.
2021/06/28 02:25:53
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I've crippled the brake and will add a kill switch. I also checked for spark and it does have spark. It just won't start. Thank you for all the suggestions. I'll keep working on it.
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AVB
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Re: Brand New Briggs & Stratton EXI725 won't start, pull is very hard.
2021/06/28 09:25:12
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CamL
I've crippled the brake and will add a kill switch. I also checked for spark and it does have spark. It just won't start. Thank you for all the suggestions. I'll keep working on it.
Have you tried inducing directly into the cylinder to see if it will even hit? If does then it fuel delivery; otherwise, it is either a valve problem or ignition timing issue.
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CamL
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Re: Brand New Briggs & Stratton EXI725 won't start, pull is very hard.
2021/06/30 00:37:28
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Got it started finally. I think the throttle was reversed from what I was expecting. It's working now. It does have more vibration than I expected. Could be the bolts I used to secure it to the frame. The original bolts were to big. I measured and the holes seemed to be 30mm so that is what I used to secure the motor to the frame. Any ideas what the default mounting hole size is? I can't find any documentation for what it is suppose to be.
Thanks to everyone that offered suggestions. I appreciate it very much.
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