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  1. M

    Proper orientation of the vertical shaft bushing in the gear case extension?

    I am replacing the vertical shaft bushing part# 40210-ZW1-710 for the gear case extension/separator on a 1998 Honda BF90A, which is also shown as Part #2 in the diagram. I have the shop manual for the engine but it does not indicate which sides of the bushing faces up....one side is slotted...
  2. M

    Repairing threads on engine mount/swivel bracket for tie bar

    I have a 1995 Sea Cat power catamaran with twin 1998 Honda 90 hp outboards. I had to replace one engine with a 1999 90hp this winter and one issue that I came across on this new to me engine was that the mounting holes on the mount bracket are stripped (red circles) so that I cannot attach the...
  3. M

    What years of 90 hp are comaptible with a 1997 BF90A with Mercury Lower unit/controls?

    I have a 1995 Sea Cat SL1 power catamaran with twin 1997 Honda 90hp with the mercury lower units & controls. One of my motor mounts/swivel brackets just blew out and I'm planning on just replacing that motor since it will be too costly to rebuild. Anyways, my '97 has the Mercury unit/controls...
  4. M

    Swivel Case & Housing Mount Seperating....input needed

    I have twin 1998 Honda BF 90hp outboards on my 21ft Sea Cat SL1 and I am looking for input with an issue I noticed with the starboard engine. The center housing mount, #16 (50161-ZW1-010ZA) appears to be separating from the swivel case, #9 (50201-ZW1-040ZA) to the point that the Circular C-Clip...
  5. M

    Help with fixing a leaky Power Trim on a 1998 BF90A

    I had my mechanic do some service work on my 1998 BF90A, and before I took the boat over I noticed red residue on the lower unit. I suspected it to be power trim hydraulic fluid and the mechanic confirmed this. The mechanic doesn't have time to work on this right now, but he seems to think after...
  6. M

    Honda 90hp maxes out at 4500 rpm's, need ideas....

    I upgraded the 2003 Honda 50s on my SeaCat Sl1 to identical 1998 Honda 90s this spring and so far so good. The only issue that I have is that the port engine gets 6000+ rpms while the starboard engine can only get 5500 rpms. After putting 60 hours on the boat so far the max rpms have now dropped...
  7. M

    Options for installing BF90 with a 25-in lower unit on a 20-in transom....

    I have a SeaCat Sl1 power catamaran and this winter I have upgraded the twin Honda BF50s to twin BF90s. I have not installed the BF90s yet as I am waiting till spring up here in the northeast, but I also need to figure out what to do about the lower units since the BF90s have 25in lower unit and...
  8. M

    Fly wheels compatability between older and newer BF40s?

    Are there any differences in the fly wheels between the older model # 31100-ZV5-680ZA ('90s) versus the newer model # 31100-ZV5-681ZA (2000s) for Honda BF40/50s? Looking at photos online it appears that it may just be cosmetic changes as the bolt hole, key hole, and magnets appear to be the...
  9. M

    BF50 tilts up when running boat in reverse

    My 50hp Honda has been running well this season thanks to help on this forum! Anyways, one item remaining that I need to fix is that whenever I put the engine into reverse and give it some throttle, the engine begins tilting out of the water. When backing up I have to keeping pressing the trim...
  10. M

    Fuel Line Routing

    Last year I replaced both fuel lines on my 1995 sea cat with twin 40 gallon tanks and I am wondering if I routed them correctly though. As the lines come off the tank there is enough slack (2-3 ft) that they sag into the bilge. There isn't anything inside the hull to suspend them on to keep them...
  11. M

    Can fuel pumps on BF50A be serviced or are they just replaced?

    I did a search but could not find an answer. I have a 2003 BF50A and I was wondering if the fuel pumps can be serviced at all or if they are just replaced. I see screws on the cover that look like they can be removed, but I don't see anything about taking them apart in the Shop Manual. On my old...
  12. M

    Source of marine engine grade bolts/screws?

    I broke two bolts and had to have them drilled out by my mechanic for a water jacket cover on a Honda 50hp. The holes were resized from 6mm to 1/4 in and I need new bolts/screws. What's a good source for marine grade bolts/screws for use on an engine block for a saltwater boat? Thanks!
  13. M

    Help identifying noise emanating from underneath fly wheel.

    I had a newer used powerhead professionally installed on a 2003 Honda 50hp Outboard last year and the engine worked great (if you have been following my other threads this is not the engine with bad pee stream). I have been getting the boat ready this year and taken it on several shakedown...
  14. M

    Weak pee stream even after changing impeller. What else to check?

    I have a 21ft Seacat with twin Honda 50s and blew a powerhead last season so I purchased a used ~2002 Honda 50hp this winter. This outboard had a weak pee stream and the previous owner said it needed a new impeller. So I changed the gaskets and impeller, which was in terrible shape, and the...
  15. M

    Having trouble removing camshaft from block

    I have a parts engine that I am trying to disassemble, and I cannot remove the crankshaft & pistons from the block! I can get the pistons about 1/2 way out but then they won't come out anymore. Do I have to detach the pistons from the crankshaft in order to remove them or will them out in one...
  16. M

    Swapping electric trim/tilt from one BF50 to another that doesn't have it?

    My 2003 Honda 50hp recently blew a powerhead and I have been looking at either replacing the powerhead or the entire engine itself with a motor of similar vintage. A 2002 Honda 50hp is for sale locally and the owner says that it does not have electric trim/tilt, but my 2003 Honda has it. How...
  17. M

    Upgrading from a 50hp to 90hp early-2000 Honda.

    I have a 21ft SeaCat Center Console powercat with twin 2003 Honda 50hps and the starboard engine powerhead is blown. I have been looking around for a replacement early 2000 Honda 50hp but haven't found one for a reasonable price in good condition yet. Anyways, my boat is a bit underpowered with...
  18. M

    Honda 50A locked up and need input!

    Hi all, great forum here and here's my first post. I have done some searches here and they have been helpful but I'm looking for more info. Anyways, I have a SeaCat 21ft CC with twin 2002 Honda 50-hp outboards (carb'd) and both engines had work done over the winter (carbs, head gaskets) by a...
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