25xs intro date into APBA

[ZUL8TR]

What year did APBA bring the 25xs into the 25ssh class? How long was it probationary? Did it immediatly obsolete the 25ss engine?

[Tim Weber]

I think the xs came in around 1984. The first ones had a long tower housing and a traditional A/B lower unit. The current shorty tower and new style foot came in a couple of years later.

If a remember, the first xs motors had a real light flywheel and broke cranks quite often. Man they were fast! This was before height restrictions and guys really had them screaming. I don't know the exact numbers but I heard a lot of bragging of guys running high 60's with the runabout and well over 70 with the hydro.

The ss didn't last long after.

Tim

[trident]

25 Xs

Tim, The gearcase was not the old A/B unit, ala 20H. It was a diecast unit with a single oval water inlet hole and a slightly larger skeg... it wasn't the long skeg like the 30H, but just a slightly bigger 'triangle' skeg.

The foam cast crescent leading edge unit was used with the new 'short' tower, which was introduced a year or so later...

[ricochet112]

I bought mine in 1986, raced it in 1987 for the first time, it was so much faster than the SS I don't think anyone raced the old SS in 25SSH much after that. When I was watching 25SSH at Lake Lawrence in 1986, if I remember correctly, all were small gearcases, long towers, and lower weights, that changed for 1987 and on.

[snyder]

I think in the fall of 83', Sam Hemp, Schmerbach, Hauenstein and I along with others test drove it in the Wolf River in Oshkosh at the Mercury dock, plant 38.

[DeanFHobart]

25 Sx

Yo,

The first time I saw a 25 SX motor (powerhead) was at the 1985 Nationals in Dayton. I know for sure Jeff Hutchins was running one on the "long" 25 SS towerhousing.

Then in 1986 Mercury came out with the "short" tower. Which was the same year they started the Mercury Challenge..... one for the West Coast and one for the East Coast.

[Big Don]

I think the xs came in around 1984. The first ones had a long tower housing and a traditional A/B lower unit. The current shorty tower and new style foot came in a couple of years later.

If a remember, the first xs motors had a real light flywheel and broke cranks quite often. Man they were fast! This was before height restrictions and guys really had them screaming. I don't know the exact numbers but I heard a lot of bragging of guys running high 60's with the runabout and well over 70 with the hydro.

The ss didn't last long after.

Tim

Does anyone know how many Yamatos were crushed by Mercury that year when the SORC got rid of the 20 class...and you could trade a Yamato in for a new 25. Several months later the SORC reversed that decision. I was real happy since my good Yamato was traded. So we sold the 25 and bought another 80.

[Guest]

Both 25XS models

Tim, The gearcase was not the old A/B unit, ala 20H. It was a diecast unit with a single oval water inlet hole and a slightly larger skeg... it wasn't the long skeg like the 30H, but just a slightly bigger 'triangle' skeg.

The foam cast crescent leading edge unit was used with the new 'short' tower, which was introduced a year or so later...

Here is a photo of the two 25XS models. http://www.hydroracer.net/forums/sho...t=8549&page=15

Alan

[ZUL8TR]

25xs models

Here is a photo of the two 25XS models. http://www.hydroracer.net/forums/sho...t=8549&page=15

Alan

What were the advantages of the short housing 25xs over the longer housing with the different gear foot? Lower cg, bigger skeg, ........

Also the the left of the early 25ss there ls another 25ss with a different gear foot (different skeg) was that a factory OEM part for a later model 25ss?

Thanks

[Joel Kiddy]

Lower center of gravity

For one there is a lower center of gravity basically like removing the gravity feed gas tank on a yamato for a boat tank. And the different gear foot, gives more control I believe.

[Blackhawkguy]

I believe

I believe the early 25XS engines where a power head-cowl- and adaptor plate used to bolt it to the old 25SS tower and gearfoot-or you could by a complete engine but it was the same configuration-I bought my fist 25XS after getting out of the Marines in 1988 and it had the new solid base cowl and the short tower-I cannot remember when I was in Vics shop and he had the new short towers to use on his excisting engines-maybe January 1996 or 97

Kerry

[sam]

Also the the left of the early 25ss there ls another 25ss with a different gear foot (different skeg) was that a factory OEM part for a later model 25ss?

No, that's probably a 20H foot on it