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Bolens 800 - High Rev Misfire Issues


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#16 propane1 ONLINE  

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Posted April 23, 2015 - 05:40 PM

Does it or is it suppose to have a fuel pump.? Noel.
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#17 MichaelBeck OFFLINE  

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Posted April 23, 2015 - 05:45 PM

I am uploading a video to google so you can hear it running if that helps, Looking at your website there DrBolens.. now this is dangerous :)



#18 MichaelBeck OFFLINE  

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Posted April 23, 2015 - 05:45 PM

Nope just gravity feed


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#19 Bolens 1000 OFFLINE  

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Posted April 23, 2015 - 05:46 PM

These did not have fuel pumps, have you tried taking out your fuel valve there is a fine screen that may be plugged, you should be getting fuel as full as the line is, if your only getting a small stream thats a problem.

 

I sent you a private message through the site



#20 MichaelBeck OFFLINE  

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Posted April 23, 2015 - 05:47 PM

Wow wish I had found your website earlier..been getting ripped  bit at Sams - 58$ for a float..couldn't find one anywhere at the time, Great website


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#21 MichaelBeck OFFLINE  

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Posted April 23, 2015 - 05:57 PM

I am going to buy a new tap from you today DrBolens - mine has no screen and doesn't actually work - I have a inline tap fitted further down the line. Had a inline filter to but that hindered the fuel flow to much and I suspect the tap is doing the same



#22 propane1 ONLINE  

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Posted April 23, 2015 - 06:00 PM

Hope you get it going. Let us know what fixed it. Noel

#23 Bolens 1000 OFFLINE  

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Posted April 23, 2015 - 06:00 PM

Wow wish I had found your website earlier..been getting ripped  bit at Sams - 58$ for a float..couldn't find one anywhere at the time, Great website

 

Yes, sam is generally about $15 to $ 20 above list price on most parts :wallbanging:



#24 MichaelBeck OFFLINE  

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Posted April 23, 2015 - 06:28 PM

Alright here are some videos of it going - you will here the miss when the exhast is facing, especially on that last video. Hopefully that gives the experts here more of a clue. https://drive.google...UE1NMGZBaEs5dkU



#25 tater195 ONLINE  

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Posted April 23, 2015 - 06:58 PM

A high speed miss on a good carb is usually ignition related. If it was a points/ condenser set up I would suspect the condenser, bad connections on the plug wire or gap on the mag... BUT.... you seem to be having fuel supply issues as well. If it can idle forever but not handle FSNL instantly, I would go back to the ignition part


Edited by tater195, April 23, 2015 - 06:59 PM.


#26 Bruce Dorsi OFFLINE  

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Posted April 23, 2015 - 09:42 PM

A few thoughts:

 

The fact that you need to pour fuel down the intake to start the engine, points to fuel or compression problems.  .....A vacuum leak or weak compression (due to valves not sealing properly, bad head gasket, worn piston rings, or scored cylinder bore) will cause difficult starting, as well as something simple such as the choke not closing completely.

 

These Wisconsin engines are very sensitive to ignition timing.   ....You mentioned that the points are gapped properly.  ...Did you use a feeler gauge, or did you set them as recommended by Wisconsin, using a continuity light or tester? 

 

Welcome to GTT !


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#27 MichaelBeck OFFLINE  

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Posted April 24, 2015 - 06:12 AM

Interestingly it started well with just choke today, it has good compression, blasts my thumb off the hole when cranked. Don't have a tester so set the points by feeler gauge


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#28 MichaelBeck OFFLINE  

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Posted April 27, 2015 - 02:36 AM

Hi folks update here. Took the 800 for a good run today - around a hour of non stop run time. It ran quite well but on occasion and totally randomly would not rev up to full tilt or would rev itself down. The misfire seemed much less frequent as the running time grew longer. I feel it to be a carb issue but am not sure what would solve it. Different theories welcomed of course. It did for the most part run quite good just doesn't always want to rev right up or hold those revs. At full throttle for instance it might just cruise along and all of a sudden rev up to where it should be based on the throttle.



#29 MichaelBeck OFFLINE  

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Posted April 27, 2015 - 05:30 AM

Could running rich cause these symptoms? - removing plug today reveals it to be quite black and sooty which is shows a rich mixture



#30 Bolens 1000 OFFLINE  

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Posted April 27, 2015 - 08:26 AM

Black plug indicates a rich mixture or sometimes can be  poor ignition.

 

Have you checked to make sure the governor lever on the engine is tight and adjusted right?






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