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Hello Terry: I have seen this many times. It absolutely is NOT an oil issue. It absolutely IS a misalignment issue. The rod is not running in the center of the bore. Careful measurements of the case bearing cups is required in order to place the crankshaft in the correct position and to...

EDIT: I want to edit this post to include the statement that some of the bearing tools pictured in this post were built by the late, great Jim Wilson. Still miss his wisdom.

These are the various sizes made to remove and install bearings from .21-1.01 CI motors.

These were supposed to be attached to the last post.

The bearing remover/installer tools made by the manufacturer(s) are great for their specific engines and may or may not fit other makers. Hudy makes these for .12-.21 motors and may fit a larger range of makers. However, I have not been able to find these available for the larger motors and...

Happy Birthday Henry! R

Hello Don. Thank you. All is good here as I hope you and yours are doing well. Merry Christmas! John....The first molds that I made were back in the early 1980's on a piece of pine board using polyester resin. I've still got that thing somewhere. Of course, the resin cracked when force was...

Here's a different approach. The aluminum shell was machined with a roughing end mill to create grooves in the sides so each mold can be slid into each half from the top of the shell and lock in place. Epoxy putty is used for the forms and a clear grease with some wax paper on the flat areas...

Technology sure has come a long way. These records were set using a heat racing Crapshooter PC71 when Greg Hughey owned the company. It had a straight shaft and pulled 1667's of various pitches and diameters. The only other thing that was changed was a shorter/thinner turn fin and maybe cut...

Jim: Hang tough. Keep moving forward and the desire will come back. I for one, would hate to see you leave this hobby. Many people have benefited from you posts on the technical aspects of "how to" perform engine building. And anything else actually. Rick

I have used this product for many years with no discolor or harmful effect on any motor parts. In a small cleaner, approx. 1\2 teaspoon per 8 oz. of distilled or deionized water. Use of tap water may leave spots from the calcium or lime content. Works better if the solution is warmed and a...

I have not measured any port changes before or since that date. I would be most interested in discussing those changes and comparing data if anyone is interested.

Can you say what year(s) this was?

Hello Greg: I have found that if you make say three head buttons of various increasing volumes, you can try each one on the same day with no problem. Use the same shims on each head and adjust the needle on the rich side (always). After each run, check the glow plug and make additional...

Very sorry to hear this. My condolences to the family.

I agree with the dyno loading thought. Our props have unknown load efficiencies, until tested on the water, and the dyno directly measures total(?) ability. Learning how to burn nitro fuel is a lifelong experience.:)

Lohring: Thank you for sharing that information. It is always great to read how others are approaching this subject. I have always favored the old SuperTigre head style, your "flat toroidal" one. The reason is that the hemispherical shape is difficult to get the correct volume in the...

Hello Jim: I am interested if you have been able to try your adjustable trim tabs to date? Thank you for all the great information. Regards...........Rick

Hello Ken: I'll take the CMB 67/80 please. I will PM or email information. Regards............Rick

Congratulations Martin! That's the greatest sound in the SAW world. Rick