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  1. Re: Calling owners of older BF90 models - basic info needed please re' carbs

    Yes thanks mate, I did end up with one brand new one and 4 old ones but recently bought another set of used ones and it runs way better at idle etc now as they're in better nick and do not have the...
  2. Re: Argh! Launch day carb issue - please help!

    Crisis averted - it's sweet as a nut now after a bit of 'gentle encouragement' from a wooden mallet. Guess it must have been a speck of dirt in the valve.

    Sorry for the panic. Have already found...
  3. Argh! Launch day carb issue - please help!

    Hi guys

    So my rebuilt boat has been on a few test runs without any problems and today is beautiful sunny, 3-5mph wind, and planned for my mate and myself to christen the boat with her first...
  4. Re: Calling owners of older BF90 models - basic info needed please re' carbs

    Very glad that this is proving helpful to others. :)
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    Re: 90s Johnson 5hp fuel mix?

    Thanks very much - someone sent me a link to a site where you can view through the service manuals online and that's exactly what it had down for it.

    Cheers!
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    Re: 90s Johnson 5hp fuel mix?

    While I think on it, when it runs on the existing fuel (it's a bit old admittedly), the engine white smokes a bit when revved. It might be normal and just seems conspicuous now I'm used to 4 stroke...
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    90s Johnson 5hp fuel mix?

    Hi guys - does anyone happen to know of the correct fuel mix for a johnson 5hp 2stroke (2 cylinder) motor from approx mid 90s?


    The model is johnson 5hp bj5drleod


    I've owned it for donkeys...
  8. Re: BF90 carbs rebuilt & refitted - one cylinder not running.

    Thanks Mike.

    Yes the prop thing seems to be a bit of a black art. I'd only consider trying other ones if I can either borrow to try out (I live in a small place so not that likely), or else pick...
  9. Re: Calling owners of older BF90 models - basic info needed please re' carbs

    I think it's useful to know as I've struggled to get definitive answers about the differences between the 75 and 90 to a degree.

    Happy ending now anyway:...
  10. Re: BF90 carbs rebuilt & refitted - one cylinder not running.

    Easier said than done Mike sometimes!

    Anyway, here's an update on things relating to carb upgrade on a BF75 (effectively changing it to a BF90).
    I finally got a much more successful run out...
  11. Re: BF90 carbs rebuilt & refitted - one cylinder not running.

    That's quite interesting - I'd love to do courses like that. Aside from the possibility of missing out on time on the water (and having a lot less free time than I used to have) I quite enjoy...
  12. Re: Calling owners of older BF90 models - basic info needed please re' carbs

    In case it's of any use to anyone in future, you cannot modify the BF75 carbs to turn them into BF90 carbs.
    Interestingly, the 90 and 75 carbs appear to share the same fundamental castings/body, but...
  13. Re: BF90 carbs rebuilt & refitted - one cylinder not running.

    Hi again - and sorry for the delayed update.
    I have the problem solved now. It was neither a spark issue, a compression issue, nor really a fuel "fault" as it were, but a setup problem that I...
  14. Re: BF90 carbs rebuilt & refitted - one cylinder not running.

    Hmmm, I was just looking at the parts diagram online and notice that the two coils are actually different parts.
    The top coil is 30500-ZW1-004, and the bottom one is 30550-ZW1-004. The top one is...
  15. Re: BF90 carbs rebuilt & refitted - one cylinder not running.

    Cheers Mike

    The coil wires have the appearance that maybe they come apart but I couldn't see any pics in the manual that showed them separated so I had my doubts.

    I can try recording a wav if...
  16. Re: BF90 carbs rebuilt & refitted - one cylinder not running.

    Thanks Mike

    I do have a spark tester, although I'm not sure what condition it's in. It's the type that is inline so it goes between plug cap and plug, although it needs the screw on bit adding to...
  17. Re: BF90 carbs rebuilt & refitted - one cylinder not running.

    Ok, this is probably going to make me sound like a clueless idiot that doesn't know one end of an engine from another (assuming I don't already), but I think I need a complete rethink on this problem...
  18. Re: BF90 carbs rebuilt & refitted - one cylinder not running.

    Thanks for the suggestions Mike - much appreciated.

    I was planning on trying spraying around the manifold spacers as you suggested but had forgotten about trying the choke thing. Stupid since...
  19. BF90 carbs rebuilt & refitted - one cylinder not running.

    Hi guys


    I've just assembled my BF90 carbs/manifold and fitted them after quite some time removed from the engine. The engine starts and runs very easily, and idles happily, but appears that...
  20. Re: BF75/90 carbs - why aren't all 4 the same?

    38 (today as it happens) so I've missed out on the quality of stuff that you describe. I was weaned with Haynes manuals as I grew up, until I found much better stuff like proper workshop manuals....
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