Do I have a long or a short lower?

[QuadManiac]

I read descriptions of the long (25"?) and short (?") driveshaft versions of the Force engines. Anyone know whether my '91 Bayliner Capri 1800's Force 90 (906X91A) has the long or short version, and how and from where would I measure it?

Thanks

 

[Dunaruna]

Re: Do I have a long or a short lower?

Your particular model # does not specify the leg length. The only information it contains is -

90 (HP)
6 (no power trim, breakerless ignition)
X (Bayliner)
91 (Year)
A (factory code for revisions)

Generally, 25" is an extra long shaft, 20" is a long shaft and 15" is a short shaft.

 

[QuadManiac]

Re: Do I have a long or a short lower?

Your particular model # does not specify the leg length. The only information it contains is -

90 (HP)
6 (no power trim, breakerless ignition)
X (Bayliner)
91 (Year)
A (factory code for revisions)

Generally, 25" is an extra long shaft, 20" is a long shaft and 15" is a short shaft.

Thanks, Dunaruna. Where did you get the number cross reference info? Interesting, because my boat does have factory power tilt and trim. The sticker on the transom mount has faded numbers and so is unreadable, but there was a small white sticker on the powerhead block with the 906X91A, which certainly met the numbering nomenclature. I would guess that since the Bayliner has a particular transom height, the leg length would be related to the "X" - Bayliner descriptor.

So, can anybody able to tell me what the measurement criteria is? I'm going to drop the lower soon to replace the impeller, and I'd like to improve my knowledge of the motor for the future. Is the measurement just the drive shaft length, or overall length of the lower, or what?

 

[Dunaruna]

Re: Do I have a long or a short lower?

Most outboard manufacturers offer 3 variations in shaft length (often called 'leg' length). 15", 20" & 25". 20" is by far the most common.

Most boat manufacturers design their transoms to suit those lengths, but not always, that's why multiple mounting holes and jacking plates are there.

To the best of my knowledge, Bayliners are 20".

Measure the boat from the lower most point of the 'V' to the top of the transom where the motor 'hooks' onto.
Measure the motor from the anti-ventilation plate to the hook. Both measurements should be very close if not the same.

 

[baxtr]

Re: Do I have a long or a short lower?

Thanks, Dunaruna. Where did you get the number cross reference info?

http://www.marinshopen.se/


hard to find if you don't speak, or in this case read the language , but look for force