Hi. I have my booklet here. The model is: HR194 PXA Engine #: 1051027 Frame#: 1014014.
The frame serial number is the mower's serial number, and I can confirm yours is in the range of mowers that might be affected by a failed Roto-Stop brake.
WAY back in 1988, Honda issued a Service Bulletin for the HR194 that had an issue with uneven Roto-Stop brake wear, which could make the mower difficult to start. The brake should be inspected for excessive wear and galling. The brake disc, drive disk, clutch spring, and clutch return springs (2) are replaced with updated parts.
Best bet is to have a Honda dealer inspect the mower and determine if the brake system needs replacement.
It could be something else, hard to tell for sure. You can find a Honda dealer in your area using this link:
Find A Honda Dealer
If you prefer to DIY, I'd suggest getting a paper shop manual from Honda; here are the links to buy one direct:
Honda Shop Manuals on eBay
Honda Shop Manuals on Amazon
Finally, here's a screen shot of the actual bulletin; note the complete repair kit is no longer available, but individual parts (
Kit contains the following items) should be...
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