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Old 17 February 2014, 09:24   #11
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Force was a brand name from mercury its a commercial obm , (supposed to be easy to repair)
I thought Force was always a brand they never wanted, ie it came with US Marine/Chrysler when Brunswick bought Bayliner and they ditched it as soon as they could. Was it really there commercial option at the time ?

www.BoatsandOutboards4Sale.co.uk
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Old 17 February 2014, 09:37   #12
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I bought one of these Merc/Mariner 125hp brand new in 1998 for my Ocean 6.25. It ran terribly. After complaining to Sowester (dealers in Poole at the time) Barrus agreed to swap the engine outright completely free of charge for a 135 V6. This included installation, the lot. They must have known even at that time these engines were problematic. The 135 was a dream, could not believe why I didn't chose that in the first place.
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Old 17 February 2014, 11:05   #13
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BoatsandOutboards, the factory in Belgium regarded the force brand as comercial. Your correct in writing its a crysler, I know I used to dread working on them, so I didnt work on many (we had lots of very nice dealers)
ribsta, I would probaly (likely) worked on your 125 obm when/if it got back to bare arse.for re-sale to a dealer, because I used to run them in the test tank,sevice them and them winterize them for resale.
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Old 17 February 2014, 13:08   #14
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Thanks for all your input . I'm in a quandary now. Can't afford a optimax. Had a grim season last year with 90hp tohatsu seamed to be problem after problem. At just over 2 grand seemed like extra power and a fresh start may be worth another trip to the engineer with the tohatsu
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Old 17 February 2014, 13:15   #15
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force - chrysler block etc but with mercury ignition, electrics and gearbox. much more basic than my mariner 75!
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Old 17 February 2014, 13:23   #16
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Thanks for all your input . I'm in a quandary now. Can't afford a optimax. Had a grim season last year with 90hp tohatsu seamed to be problem after problem. At just over 2 grand seemed like extra power and a fresh start may be worth another trip to the engineer with the tohatsu
Why not look for a decent 2nd hand 2 stroke Yammie 90?
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Old 17 February 2014, 13:35   #17
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Had a yammie 80 auto lube on the my last rib was great till it blue a piston. The extra hp sort of helped to justify the expenditure.
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Old 17 February 2014, 14:01   #18
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Just my observations as an owner of a 2+2 mariner 100hp carb 2 stroke, and past owner of both a 90 carbed yam and 115 optimax

Tickover is not lumpy at all- no better or worse than the yam

Stooging around harbour speeds is no issue at all - the transition to 4 cyls is way outside harbour throttle ranges.

There is a marked lurch on passing the throttle threshold for the other 2 cyls to open up when gunning it, which I admit can be uncomfortable for the uninitiated. Some people like the acceleration! It is fine for leisure skiing/towing etc as long as your boost pump and associated plumbing is working fine and you give it full bifters; the transition is then fine at least for amateurs like me.

If you increase throttle v.slowly then then 'boost' pump that aids transition from 2 to 4 has little effect and it can sound rough ( it is like a plunger pump that is pushed by the throttle arm).

I use the boat for diving so spend long times stooging around. In theory this would save fuel but surely it is insignificant compared with WOT fuel rates?

Oiling of the 2 non-idle cranks and rods still takes place via crankcase as usual. Theoretically the upper ring may get less oiling??? Engine is 1996 and no noticeable problems in this respect ( touch wood)

Would I buy an hpdi to replace it? I value reliability and at-sea maintenance over fuel economy, so no. We had many more issues with electronics on the opti.
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Old 17 February 2014, 14:04   #19
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I loved the 90 yam carbed 2 stroke. If this 2+2 died and funds were tight I'd look for another yam 90 to replace it
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Old 17 February 2014, 14:06   #20
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You're not helping my quandary
Lol
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