HARD STARTING

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ub54
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HARD STARTING

Postby ub54 » Wed Apr 27, 2016 11:43 am

My Cub runs fine, but when I try to start it I have to have the throttle at an idle. Then once it gets to idling I can increase the throttle and it runs fine.It doesn't help to choke it, in fact it makes it worse . I've re-set the mag , ( the first time that really helped ) checked the points , plugs , fuel and all that and checked valve lifter clearance . What am I missing besides a valve job and rings?

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Re: HARD STARTING

Postby ricky racer » Wed Apr 27, 2016 11:53 am

A compression test both wet and dry would be your next step. Post your findings.
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Re: HARD STARTING

Postby ub54 » Wed Apr 27, 2016 12:17 pm

I have 2 compression testing sets but I'm sure none of my attachments will fit the plug hole . I'll check again and get back

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Re: HARD STARTING

Postby Eugene » Wed Apr 27, 2016 1:38 pm

Thoroughly clean the carburetor, then set the float height.
I have an excuse. CRS.

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Re: HARD STARTING

Postby Puffie40 » Wed Apr 27, 2016 1:41 pm

How is the spark? A weak spark will affect how it starts, and the fact that choking the motor makes starting worse supports that IMO. If the spark is weak, check the resistance of the plug wires first before looking at the coil, and ensure they are low and uniform.

Does your engine burn oil? Usually low compression and oil burning go hand-in-hand.

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Re: HARD STARTING

Postby ub54 » Thu May 12, 2016 3:45 pm

Sorry it took so long to bet back , got tied up with my brothers Farmall H . I'm pretty sure I have my timing marks mixed up . I have mine set at the first one that comes to the arrow and think it should be timed to the second . Does that sound right ? Or would it even run timed to the first mark ? I'm going to get on it in the morning.

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Re: HARD STARTING

Postby Eugene » Thu May 12, 2016 3:54 pm

ub54 wrote:I have mine set at the first one that comes to the arrow and think it should be timed to the second . Does that sound right?
2nd mark on the pulley to line up with the pointer is TDC, or the correct point for initial timing.

The engine will run, like crap, if the ignition is improperly timed.

Next question. If the distributor was removed from the tractor to install the points and condenser, did the mechanic time the distributor to the engine?
I have an excuse. CRS.

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Re: HARD STARTING

Postby ub54 » Thu May 12, 2016 5:15 pm

Yeah , its good to go . I think I timed it to the wrong mark when I change the points last fall even though I didn't need to ,

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Re: HARD STARTING

Postby Puffie40 » Thu May 12, 2016 7:38 pm

If you suspect timing, being 180 degrees out of time would also cause starting issues.

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Re: HARD STARTING

Postby ub54 » Fri May 13, 2016 7:19 am

I wouldn't think it would run 180 out of time

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Re: HARD STARTING

Postby ub54 » Tue May 24, 2016 5:26 pm

OK, I checked compression . #1 was 115 #2 was 113 #3 was 118 and #4 was 98 . #4 and #2 plugs were kinda sooty , #1 and #3 were good . I realize the discrepancy on #4 but it always ran good once I got it going , but now its lost a lot of power too. I was thinking of trying to rotate the mag a little while its running or is that a bad idea . I'd love to grind the valves but I don't have a spring compressor . Any more ideas and thanks in advance .

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Re: HARD STARTING

Postby staninlowerAL » Tue May 24, 2016 8:35 pm

Check the valve clearance and adjust as necessary to spec.

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Re: HARD STARTING

Postby Glen » Tue May 24, 2016 9:50 pm

Hi,
Here is a page from the Cub owner's manual showing how to adjust the valves.
If it won't start normally, the spark could be weak because of a weak coil, a common problem with Cubs, the coil sometimes gets weak after years of use.
Like they said above, it has to be timed right too. :)

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Re: HARD STARTING

Postby Eugene » Wed May 25, 2016 11:01 am

OK, so you have a magneto.

Roll the ignition off, engine over until the TDC mark and pointer line up. Check the location of the rotor tip. If not pointed at the #1 spark plug tower location on the distributor cap, rotate the engine one more time until the magneto clicks. Then roll the engine backwards until the TDC mark and pointer line up. At this time the rotor tip should be pointing exactly at the #1 spark plug tower location.

Possible that the rotor was not installed correctly when points were replaced.
I have an excuse. CRS.

ub54
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Re: HARD STARTING

Postby ub54 » Wed May 25, 2016 12:53 pm

OK , I checked the valves . Only had to adjust # 4 a little bit and went ahead and changed the plugs . Then I checked the spark and had a good blue/white spark. When I tried to start it it fired right up at about 4 notches of throttle. So I did it again fired right up. So then I went down to finish my mowing , and it just doesn't have the power . I would normally mow in second gear but now I'm down to first and it ain't gettin it .Seems to get worse the longer I run it . Back to the timing , I thought I read that the first mark to line up was the correct one . Better yet I'll put it this way , if facing towards the front of the tractor if it turns clockwise I'm set at the first or counter clockwise the second


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