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#1
08-02-2010, 05:56 PM
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Need Help
I just replaced my Cub 7hp with a 10hp both from a narrow frame. The 10hp seemed to run good before but now I can't get an idle it keeps stalling and full is rough, adjusting both needles does little help (engine is a gravity feed fuel), do I need to rebuild carb? Now the hard stuff, engine was a drop in fit, but I can't get the driveshaft to stop spinning with the clutch in, the only way to stop it is turn it off put it in gear keep clutch in and then it doesn't turn till clutch is let out. I tried adjusting it (turning adjust nut in) but no luck.
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#2
08-02-2010, 06:18 PM
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If you didn't lube the pilot bushing when you put the engine in, that's why the clutch is hanging up. As for the engine, check the timing and then rebuild the carb if that doesn't help.
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#3
08-02-2010, 06:39 PM
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Matt---Thanks for the reply & help. I'm new to cubs so I hope my question isn't to elementary, but where is the pilot bushing located? Must the engine be move forward? Wish the service manual had noted this. Thanks.
Rich
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#4
08-02-2010, 07:00 PM
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Yes, the engine must be moved forward. The pilot bushing is the bronze bushing in the middle of the 3-pin clutch driver that the driveshaft pilots into, hence its name. Read your service manual again
 :biggrin2.gif:
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#5
08-02-2010, 07:46 PM
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Thanks Matt G. for all your help. I'll pull the engine and grease the bushing tomorrow, and try that static timming you mentioned. Can you or anyone suggest anything else that might need attention.
My next project is this model 100 I just picked up over the weekend. This one will be a total restoration over the winter. Looks like the last owner went a bit overboard with the paint.
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#6
08-02-2010, 10:52 PM
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You should have used the 3-pin drive plate from the 7hp. as it is worn to it's own driveshaft.
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#7
08-03-2010, 02:09 PM
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Thanks johncub7172, next time I do such a job I will at the start. What I did so far is what MattG. said, but I cleaned the driveshaft at the bushing end with a light filing to remove rust and any edges then greased it. Its a bit too hot out to finish the job here. My plans are to remove the spark plug and turn it over by starter with the cluch depressed and see if the driveshaft moves. If it does then I'll do as you advised. Again thanks for both your inputs.
Semper Paratus
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#8
08-03-2010, 02:37 PM
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It is also possible that the engine is setting a little crooked in it's mounting holes putting the drive shaft and pilot bushing in a bind.
The end of the drive shaft should have been greased before installation but try to loosen the engine mounting bolts and start the engine (with the bolts loose) to see if the shaft still turns with the clutch pushed in.
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#9
08-03-2010, 05:32 PM
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Yosemite Sam--Great idea, I'll try that in the morning along with the other ideas I've recieved. With all the other ideas in play I'm sure it will work fine then. I think I found my idle issue, the carb. had water at some point in it as well as 2 coats of paint, I'm never able to understand why people paint them---go figure. It cleaned up nicely after several hours of work. I think it would pay me to change the points seein how the carb. was.
Rich Semper Paratus
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