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I made a dial indicator for my antique KG4 and KG7s and a battery with a light bulb for breaking points. I will obtrain a timing light and get a depth guage. my problem is the spark plugs are...

I thought hi octane fuel would not benefit these motors much. No I do not have a buzz box nor a dial indicator to check timing. The flywheel is marked so that is good.I need to get a depth guage, I...

Here are the OMC specs

Minimum combustion chamber at T.D.C to top of spark plug hole 13.5 cm cubed. I do not know the volume of the spark plug hole.

cylinder bore .030 over at 2.218 in.
...

Based on my experience with stock 2 cycle outboards the formula yields fairly close results after several hand pulls compared to compression gage readings. Also I have noted that the first pull...

Thank you for the replies.

Sam regards to two stroke compression. If I calculated cylinder volume above the ports that should correct the problem you stated?

Team member, does the K factor...

What is a good compression for the 15 Mercury A and the 15 OMC A motors? I have ben told that many guys do not consider compression very important. I disagree and think that compression does have an...

Much progress has been made. Two of the six kids said they will race at Silver Lake, Everett, Wa this weekend. June 5. One in J the other in AXH with an OMC. The other four are not as far along in...

Possible problem with the lean running condition of the lower cylinder may be a bad lower seal thus less fuel draw and a lean running condition. The motor did not have what I would call full strong...

Sam,

You stated, "A white spark plug generally means too lean, which would be very uncommon on the bottom cylinder of a Merc twin." I AGREE WITH YOU 100% AND THAT IS WHY I AM PUZZELED ALSO. I...

Well we got two of the grandkids out on the water Jan 9. The weather cooperated and didn't pour on us at Kitsap Lake, Bremerton, WA. We used the runabout with a KG7 standard lower unit. I did three...

Bill Says,
"Why not just run the Merc 15 with stock lower units? We do it with OMCs...."

That would work except I do not have stock lower units. I do have two complete KG7s with stock lower units...

Bill, you are so deceptively cunning, chuckle chuckle. It may work for you but my wife says I am the most unlucky auto driver. I drive the speed limit and always wear my seat belt. The first...

Thanks Bil and AZ.

I forgot there is only one restrictor plate for the Mercury.

Others have told me that these Mercurys are pretty tough motors and have a long service life and good materials...

Hi, I am returning to racing, this time with six grandkids. The equipment is certainly different in the A/B classes.

I Just took delivery of a new Mercury J/A motor with the new conversion...

Eliminations in J? That is awesome. That has got to be a rare occurance these years in racing. In the 50's, I believe it was more common.

Right on about boat familiarity etc. I have...

Eliminations in J? That is awesome. That has got to be a rare occurance these years in racing. In the 50's, I believe it was more common.

Right on about boat familiarity etc. I have...

Daren,

I called John tonight and he was enroute from Arlington and stopped by. We had a great visit.

Yes, my opinion of Norm is the same. I hope we can keep him involved somehow. Perhaps I...

Daren,

You are correct. We seem to have a connection with boat racing and collegiate wrestling. The neat thing is Norm is going to build a plane. I have been there and done that. I am returning...

Tom,

Question, You stated that CG changes with the classes. Does that mean the CG must move forward for the faster speeds to compensate for the increased bow lift?

In turning, how do you test...

Tom,

That sounds fantastic. A club owned setup with mentors. Sure beats investing in setups only to find the kids don't have the desire to participate.

I have been in model control-line...

Mark 75

Amazing, how rumors become legends. Sometimes I prefer legends. More interesting and adds color to the memory. Oh well, back down to earth. At least we can be aware that Hu certainly...

Tom,

You have made my day with your explainations and especially the fotos of the boats. Gets your heart thumping. A very good primer for newbys and my grandkids will understand it.


I plan...

"1. You must get thru the corners and pop the bow as fast as possible coming out of the corners. Weight placement plays into this."

Does this mean you shift your weight to the rear for...

"1. You must get thru the corners and pop the bow as fast as possible coming out of the corners. Weight placement plays into this."

Does this mean you shift your weight to the rear for...

I have heard that from other sources as well. As I understand it, and please correct me if I am wrong, but the J setups need more distance from the bottom trailing edge to the prop. This is so, when...

You are right again with respect to J. In fact everyone has the same disadvantage in that everyone must use a prop provided by the racing club sponsoring the race. According to Craig Dewald, he can...

You are correct.

I assumed the same boat, prop, setup, envirionmental conditions. When you change drivers you need to adjust weights to maintain the same CG to repeat the same trimmed ride. That...

I' am getting back into boat racing after a respite since 1963 with the grandkids. These six kids come in all sizes and weights thus CG becomes a consideration in trimming. Recent experiences with...