". Will the liner piece take up a 1/4 inch of slack. Another words is the liner about 1/8 inch thick?" Never measured one but I would say yes, well actually it is only going to take up 1/8" in one direction, 1/4" if you slide it back and forth, but if it has the Soft Start Clutch as I described it, that is likely your problem. Walt Conner

You never mentioned the Snapper series you have. Is yours the older model with the handle bars or newer with a steering wheel? You may be able to go to the Snapper site and get an owners & parts manual, IâÂÂm not sure if a service manual is there. http://www.snapper.com/us/en/support/manuals As mentioned, I owned one many years ago so my memory is not clear any longer on how it functions. When I sold it I gave the new owner the owners manual and repair manual so I'm unable to reference them. I recall there was a clutch spring adjustment that had three position holes, you may try to move it to another hole to reduce the spring tension. Look at part # 18 & 29 at the link below for reference. http://www.partstree.com/parts/?lc=snapper&mn=28086S+28%22+8+HP+Rear+Engine+Rider+Series+6&dn=8608 Are you using this mower on hills? This may be causing your problem if the incline is too steep. Lastly you can always try to move the disk drive up towards the engine to reduce the pressure being put on the rubber wheel. It may be out of specs (3 3/4 to 3 7/8) but worth a try. Since you're at 3 7/8 try 3 3/4, if that doesn't work try 3 5/8 or less. Hopefully your new disk is still useable.

Thanks! I found out where to look up publications on the snapper website and from what I can tell just looking at the ads pictures the mower is a 1990 or 91 series 7 or something close to that. The guy who is selling it says the mower is only 5 years old???? Not sure how that can be when snapper hasn't made a 12hp 33 inch hi-vac for years! Any suggestions??

I'll try to answer some of this, but I am "supposing" on the differences between the T-K module for Tecumseh engines and the B module for Briggs and Wisconsin engines. My "guesses" of why there are 2 different modules could be listed as follows. (1) Possibly a significant difference in the potential voltages in the primary circuit of the different brands magnetos. (2) Possibly a difference in the "cranking RPM value", or the low idle RPM value, between the brands. For the module to be effective for Snapper's intents, it must be able to distinguish "cranking RPM" from "running RPM" or it is useless. Tecumseh and Briggs both seem to fail in offering any kind of "low idle RPM value" and instead refer you to "check with the equipment manufacturer", but Snapper fails to give it as well. Snapper is "evasive" about the reason and only states that "if the wrong module is used, it will DEFEAT the purpose of the interlock system. They state only that the engines will start with the wrong module in place, not how/why that happens. Why just 17 HP? pjb found the engine at a yard sale for short money.