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If you are worried about the cost of a book, you cannot afford to start modifying an engine.

A couple of rules of thumb. Make small changes as you can quickly ruin a block. Find a book on the subject (Two-Stroke TUNER’S HANDBOOK By Gordon Jennings). Talk to someone who has modified the...

The stock M50D2 Tohatsu has low port timing, Transfer at about 58 degrees, and exhaust at about 82.5 degrees. Taking the exhaust up will allow the torque and HP curve to go up. My calculations tell...

With a divider, the overall transfer port can be wider. A port opening can only be about 65% of the bore in width or the ring will grab the edge. Also, with a divider you can better direct the...

OK, I will bite. I have never heard of Mr RAANA nor do I understand what you want me to see in the photograph. I am truely interested, so do not take this to be other than honest.
Thanks,
Neil...

I understand thats a highly modified Yamaha 50. No one has taken the time to modify the Tohatsu/Nissan M50D2, which is very simular to the Yahama 50.
However, I percieve the parties in discussion...

What are you going to build? If it is an SE/FE under 50ci, both are a good choice. However, Bass Machines can provide a stock race ready Tohatsu Model M50D2 that dyno's about 58 HP stock, more if...

Jeff, Dave Scott and I have talked on the phone several times. I was just poking at Dave as he thinks a lot like me. No bad intentions. I wish everyone agreed with "let's just go racing". I grew...

Dave, you buy one and I will see that you get the parts. Need a short block, long block, or just parts. Or are you just looking for rusty parts?
Neil

You guys are hilarious, keep it coming. I need something funny after reading about the APBA SORC wisdom.
Neil Bass

We never tried that, but I have witnessed fuel run that milky. I am certain there is optimum moisture content for each engine. Would be an interesting experiment. However, the optimum would change...

As soon as you open a new barrel of alcohol it absorbs moisture from the air. You may start with some real high percentage alcohol but by the end of the season it has dropped several percent. We...

Racing alcohol ranges from about 92% to 96% fuel, the rest is water. We have adjusted the water content to adjust the lean-rich. Some water seems to be good, but too much is just wet. All it takes...

The water injection into pipes is to cool the exhaust gasses thereby making the pipe look longer to the engine. (the speed of sound is slower in cooler air than hot air) Extending the pipe or...

[QUOTE=Mike Schmidt;27047]

One spring I was in a time crunch, like most boat racers and decided to try something new. I glued the sleeves in with Loctite Quick Metal. I had been useing it for...

Leaving it on the boat is convenient, but there is a method for easy removal. Most boats have a 1/8 to 1/4 metal sheet on the back of the transom. We recommend the sheet be set about 3/8-inches...

The at the last annual meeting the SORC approved .030 inch beveling the exhaust port on the 44xs. The logic, as I understand, was that some engine builders have been doing that and they have been...