Ask Experts Questions for FREE Help !
Ask
    doorop's Avatar
    doorop Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Apr 25, 2010, 09:04 PM
    17.5 hp I/C OHV briggs & Stratton when trying to start makes about 2 revs and stops.
    Motor seems to lockup from compression. New battery exhaust valve set @ 7thou. Intake @ 4thou. Will start sometimes if you manually turn motor backwards prior to starting so it gets a good turning start.
    Please help need to mow.
    cramorranchette's Avatar
    cramorranchette Posts: 3, Reputation: 1
    New Member
    		  
    #2

    Apr 25, 2010, 10:56 PM

    Check to make sure the battery is fully charged & term. Connections to starter are not corroded, next check the starter bendix gear for ware or starter may be draging.
    Sounds more like a starter problem.
    crigby's Avatar
    crigby Posts: 4,343, Reputation: 107
    Outdoor Power Equipment Expert
    		  
    #3

    Apr 26, 2010, 09:28 AM

    Hi,
    Both valves should be at 0.004"
    Peace,
    Clarke
    DG's Avatar
    DG Posts: 1,375, Reputation: 109
    Ultra Member
    		  
    #4

    Apr 26, 2010, 08:28 PM

    Like Crigby said 0.004 for both.
    If the exhaust is that wide it would keep the compression relief from working .
    Luck
    rmelb's Avatar
    rmelb Posts: 2, Reputation: 1
    New Member
    		  
    #5

    Jun 28, 2010, 11:36 AM

    Have the same problem... valves were set by a shop... still have same problem when do I measure the .004, tdc? Also now have gas mixing into my oil! Any suggestions to this one? Thanks for any help!!
    DG's Avatar
    DG Posts: 1,375, Reputation: 109
    Ultra Member
    		  
    #6

    Jun 28, 2010, 04:06 PM

    I/4 inch after tdc.
    rmelb's Avatar
    rmelb Posts: 2, Reputation: 1
    New Member
    		  
    #7

    Jun 30, 2010, 08:30 AM

    Thanks got it!
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #8

    Jun 30, 2010, 09:14 AM

    That means set both of the valves to 0.004 when the piston is 1/4" after top dead center; (power stroke of a 4 cycle engine

    1/4" can be found using a dial indiator in the spark plug opening.
    doorop's Avatar
    doorop Posts: 3, Reputation: 1
    New Member
    		  
    #9

    Jul 2, 2010, 05:12 PM
    How I fixed my problem after changing valves to 4thou, battery and starter.
    Removed spark plug installed modified antifouler with elevator jack bleeder valve reinstalled spark plug opened bleeder valve 1/8 turn started engine closed valve. Mow's and runs great
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Briggs & Stratton 14.5 HP OHV No Compression [ 3 Answers ]

My Riding mower has an 8 year old Briggs & Stratton 14.5 HP OHV Engine. Engine always maintained properly and has run well. While mowing, engine ran well for an hour and then suddenly quit for a split second, and backfired as it came back to life. I continued to mow and it did it again, the third...

Briggs & Stratton 16.5 OHV [ 19 Answers ]

I have a B&S 16.5 OHV MTD Yardman that will not turn over even though the starter and battery are OK. It will turn to a point and then stops. If I remove the spark plug it turns freely like it should. I know that removes the pressure in the cylinder but I don't know what could cause it to bind...

14HP OHV I/C Briggs & Stratton Problems. [ 15 Answers ]

I purchased this motor used around July of 07. I believe it came off a Murray riding lawnmower. It ran fine for the first three months (occasional smoking) or so then after a 2 week break of cutting it was hard starting. Took about 2-3 minutes but it started, a little smoke at start up, I made a...

17 HP OHV Briggs& Stratton Engine [ 2 Answers ]

Will this engine run without a battery once jump started?

Briggs & Stratton 16hp ohv [ 1 Answers ]

I have a Toro ride on lawn tractor. It is blowing oil through the exhaust manifold. I have already changed the head gasket and rocker arm cover gasket. It idles fine at low rpm's but when I kick it up the motor starts to blow white smoke, oil comes out the exhaust, and the engine rpm's go up and...

View more questions Search