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  1. Replies
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    Its better to use the tiller stub like in photo....

    Its better to use the tiller stub like in photo. Had lot midsections crack when using powerhead bolt on Yam. (Mostly on tunnel boats).
    If you use powerhead bolts add stabilizer link each side to...
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    3,154

    Thank you for your reply. engine runs fine for 3...

    Thank you for your reply.
    engine runs fine for 3 laps then starts to reduce throttle because port bank EGT sender measures 68 deg C. Dropped gearbox and removed stats and can blow through, so dont...
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    4
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    3,154

    200xs optimax sst200 water pressure

    Hi. We have a optimax 200 SST with 3 hours from new. After 3 min running it holds Bach and throttle is reduced. Scan says port bank EGT too high 68deg. Starboard bank 55deg. Throttle position sender...
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    59
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    54,820

    I would just like to stop the thinking!! that the...

    I would just like to stop the thinking!! that the Yam 70 is a weak engine if you carry out any work to the engine. This is not true. We race every Thursday evening (20 weeks) plus a National series...
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    54,820

    Sorry Jeffrey, Don you are right !, it has gone a...

    Sorry Jeffrey, Don you are right !, it has gone a little astray.

    I think try what you have see how it goes first. Then if you want to go faster, start with the prop before you start on your engine...
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    59
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    54,820

    What rules do you run to for engines , do you run...

    What rules do you run to for engines , do you run 60 or 70 gears ? Are you looking for complete engines or just powerheads Let me know whats good for your racing and I can find Good, fast motors....
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    59
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    54,820

    Don, I understand some of what you say, I...

    Don,
    I understand some of what you say,
    I have opened new "out the box" Yamaha 70ces and the porting in some places can be very close to each side of UIM spec. But I think this is more to do...
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    59
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    54,820

    Looking at your photos, looks like 1 piece cyl...

    Looking at your photos, looks like 1 piece cyl head. beware of core plugs in head, they pop out, use plate strips between cyl head bolts to hold them in. watch cyl head bolts (2 washers on each bolt)...
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    54,820

    Hi Jeffrey, Do you have photo of boat and...

    Hi Jeffrey,
    Do you have photo of boat and engine, I guess if its a F4 its one I will know ??
    175 psi is the lower side of good if it has 1 piece head. If its got 2 piece head 175 is good.
    Bottom...
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    Don't know if it helps !! but the old 2 cyl 60...

    Don't know if it helps !! but the old 2 cyl 60 yam short shaft fits straight on Yam 90 powerhead. (90 yam was 2 cyl 60 with extra cylinder added )
    Some people are still running this combination...
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