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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: Precision ?
Date: Sat, 21 Jun 2025 19:07:54 -0400
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"Bob La Londe"  wrote in message news:103754e$190p0$2@dont-email.me...

  Of course you expect failures on those small engines every other trip
to the track when you are chasing tenths of a second on the 1/8 mile at
RPMs in the multiples of what those engines were designed for.
------------------------------

Here's an example of a 212 Predator set up for racing:
https://www.nrracing.com/product-p/eng-rac-212-level3.htm
"Dyno Tuned & Tested (approximately 16+ HP on our Dyno and 20+ on the other 
guy's)"
I've seen 28 HP claimed, over 4x stock.

The limit on the HF 212 on my sawmill is blade tension which is only about 
60% of the suggested value because it's already half again the motorcycle 
wheel and tire load rating. Tension keeps the blade from twisting from 
cutting pressure and rising or falling in the cut. 6.5HP is enough for a 20" 
cut in oak until the blade dulls a bit, then I file it with a roller guide I 
made.