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  1. mainstream

    RPM Differences

    Hello I bought my 370 back in 11 as a left over with 46 hours on it but it had sat for almost 3 years and barley ran after putting about 100 hours on it I had a similar issue where my port would only spin at about 4000 at WOT and the specks for 8.1 are between 4400 and 4600 depending on load...
  2. mainstream

    Mercruiser 8.1 running rough

    I have an 09 350 had the same issue plugs and wires fixed me up good luck
  3. mainstream

    Ok at 20 mph, too hot at 22?

    Did you check thermostat or it could be plugged block do you have sea strainers or are they iOS
  4. mainstream

    Transmission oil change

    I'd warm it up to thin it out.
  5. mainstream

    Can't get on plane?!?!

    I would do plugs cap and wires if you had bad gas plugs are probably fowled my boat is 20000 lbs wet and at 3400rpm I'm doing 26 mph wot is 4600 and 39 mph by gps
  6. mainstream

    RPM range for 8.1L Horizon motors

    4400 to 4600 HO is to 4800
  7. mainstream

    Scary Noise when put into gear

    Vessel view will not give you a miss fire code your engine PCM will keep adjusting engine to try to get smooth so you could have a miss fire issue. Vessel view gives you more serious engine damaging codes like low water psi high temp transmission and engine low oil pressure things that will...
  8. mainstream

    My first searay, my first big boat, need some basic help

    I use the safety hasp on my windlass at the end of the day the chart plotter you have to plot your course around the land by placing way points on the chart it does not do it for you the auto pilot follows your course in the chart plotter so if you plot in deep water it will keep you in deep...
  9. mainstream

    Engine won't reach max RPM after tune up?

    When was the last time you did wires and plugs you may just need a tune up.
  10. mainstream

    Have You Been Boarded By CG With Weapons Onboard?

    When you leave your home port or residence it is no longer your home and you fall under the jurisdiction of the state your are in so if in mass or NYC or jersy you go straight to jail and don't pass go. Unless you end up in a state that reciprocates with your home state you can pass thru other...
  11. mainstream

    Have You Been Boarded By CG With Weapons Onboard?

    I believe it all depends on who has the jurisdiction if you are say on inland water ways which fall under the state local state and cg you better hope your lic reciprocates with the state like you leave nh waters and cross into mass waters with a weapon even ln a locked box federal laws say you...
  12. mainstream

    Etiquette while tied up together

    It all depends on raft up size we usually have multiple hooks dropped front and stern so it would depend on boat size but mostly we don't slip boats in
  13. mainstream

    no speed

    When were plugs and wires changed last
  14. mainstream

    Black Stains around exhaust outlet

    With only 8 hours was the boat laid up over the winter out of the water if so it could be the carbon deposits left after all the moister dried I get it for the first couple hours every year after seasonal lay up.
  15. mainstream

    Why is this? Engine temps different...

    Do you have water heaters mine is on the port so my port runs 8 degrees lower then my starboard do to the extra load of the cooler water in the water heater also see higher pressure due to the higher head of the water heater exchanger.
  16. mainstream

    Sync issue

    Hello when were the wires and plugs replaced last the computers on these engines will make adjustments so it seems all is good until it can't anymore and you get miss fires and raw fuel this happened to me with 8.1s
  17. mainstream

    Speed question on 2002 340 Sundancer

    Hello bob that would be around 23 to 25 mph with vdr correct if so that would be about right if you had stern drives you would get alittle more out of her but I don't know how you have her weighted or type of seas you are running in
  18. mainstream

    New 350 Sundancer

    Most jump packs come with the cig adapt on them you cig outlet is right near your cup holders near your speaker next to the helm seat
  19. mainstream

    2008 8.1 horizon raw fuel in exhaust

    Like I said unless you hook a a scan tool you won't know if it's running normal the only way fuel is getting into your exaughst is it's not firing or you have and open valve which would cause no compression so I would call a mechanic if you don't think it could be a ignition problem where a...
  20. mainstream

    2008 8.1 horizon raw fuel in exhaust

    How much is large are we talking a sheen on surface or just smell I had a small sheen when it ran and if you cool fuel is messed it won't run right at all I have same boat and had same symptoms if the wires and plugs have not been done I would start there
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