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5/22/15 I have a Bobcat M 610 with a Wisconsin engine. When

Customer Question
5/22/15 Hello I have a Bobcat M...
5/22/15
Hello
I have a Bobcat M 610 with a Wisconsin engine.
When I start the engine, it will start and run at low rpm. When the throttle is moved to run at higher rpm it stalls, if throttle is
moved quickly back to lower rpm position, it recovers and continues to run. If throttle is left at high rpm it stalls and dies. I
installed a new gas filter and new fuel pump.
The machine is able to be driven and bucket is moveable at low rpm, but as soon as the rpm is increased the engine dies.
Usually the engine will restart.
Can you help?
Thanks, Duke
Submitted: 2 years ago.Category: Construction and Road Equipment
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Customer reply replied 2 years ago
I noticed pressure buildup in the gas tank
Answered in 6 minutes by:
5/23/2015
Mechanic: Curtis B., Technician replied 2 years ago
Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 29,133
Experience: Technican turned service manager with multiple lines of equipment and rental units.
Verified
With the VH4D, have you checked for spark on all cylinders? I suspect you have engine that may be only running on two cylinders! Loosen the spark plug wires and with engine idling, pull off one wire at a time and check for spark. Then pull both wires on one bank, to see if engine continues to run. If engine dies when both wires are removed, the opposite side is not firing.
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Customer reply replied 2 years ago
I loosened the spark plug wires and with engine idling, pulled off one wire at a time and check for spark. Then pulled both
wires on one bank, to see if engine continues to run. Engine continued to run.
Mechanic: Curtis B., Technician replied 2 years ago
Distributor or magneto? Have you replaced the points and condenser in the distributor? Have you tried moving the timing?
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Customer reply replied 2 years ago
The points and condenser in the distributor are ok, also installed new plugs
Mechanic: Curtis B., Technician replied 2 years ago
Point gap correct? Have you tired to turn the distributor to change the timing? Have you checked the manifold vacuum with gage, to see if the vacuum falls off to near zero on throttle up? This would show if the exhaust is plugged.
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Customer reply replied 2 years ago
The engine had a tuneup by a mechanic. I have no means at this time, to check the manifold vacuum with a gage. The muffler is
accessible and the exhaust is steady
Mechanic: Curtis B., Technician replied 2 years ago
Engine not throttling up can be many things, but the points setting is one that needs to be right! And the timing needs to be set. Did it run right after you got the (tuneup)?
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Customer reply replied 2 years ago
Yes
Mechanic: Curtis B., Technician replied 2 years ago
Have YOU checked the points?
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Customer reply replied 2 years ago
No, but I will. I'll have to do it tomorrow.
Mechanic: Curtis B., Technician replied 2 years ago
OK, points on 4 cylinder needs to be .020 to .025 inch.
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Customer reply replied 2 years ago
I will check the points. I believe they are properly set, what are the next things to do while I'm at the engine
Mechanic: Curtis B., Technician replied 2 years ago
See if the carburetor has good fuel flow to it, when cranking.
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Customer reply replied 2 years ago
I will check if the carburetor has good fuel flow to it, when cranking as you suggest, when I changed the fuel pump I checked
the flow at that time, but I will check it again. What else?
Mechanic: Curtis B., Technician replied 2 years ago
Next I would try turning the distributor to change the timing.
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Customer reply replied 2 years ago
I am uncomfortable messing with the timing on an engine that starts with no problems.
Mechanic: Curtis B., Technician replied 2 years ago
OK, I can under stand that. But all you have to do is mark where it is, so you can return it to the exact same place if needed. Let me know what you find. Thanks.
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Customer reply replied 2 years ago
What do you want me to change it to?
Mechanic: Curtis B., Technician replied 2 years ago
I always just move it as engine is running , a little bit at a time, to see if it runs better or worse, if worse, I go back the other direction! I set it where it runs the best, ***** ***** down the distributor.
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Customer reply replied 2 years ago
Are you saying move the distributor a bit tighten it down then drive it to see how it runs, or runs at an idle?
Mechanic: Curtis B., Technician replied 2 years ago
I would just do it at idle, and then check it, just loosen the distributor so it can be moved, not fully loose! Then if it seems to run better, then run your test!
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Customer reply replied 2 years ago
The engine runs great at an idle right now, the problem is running at a high rpm or full throttle
Mechanic: Curtis B., Technician replied 2 years ago
You have to make some changes , unless you are satisfied with idle. I can only make suggestions that I feel will help. Something has changed since you had it tuned up!
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Customer reply replied 2 years ago
I agree something has changed since it was tuned up, and I am happy to make changes, but in your last suggestion your asking me to adjust the distributor to attain a good running engine at idle, that is already running good at idle. Again the problem is the engine does not run at a high rpm or full throttle. I understand you know more about mechanics than I do, so I will do as you suggest because maybe I am missing something.
Mechanic: Curtis B., Technician replied 2 years ago
OK, let me know. I will be here.
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Curtis B.
Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 29,133
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Experience: Technican turned service manager with multiple lines of equipment and rental units.

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