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Search results for query: exhaust back pressure

  1. Cobra Jet Steering LLC

    single engine exhaust modifications

    Just remember 1 thing that people experience when the exhaust is too low the engine won't start this occurs when they are wake surfing and using ballast the low side has issues restarting due to it being further under the water therefore dealing with more back pressure on the exhaust and I...
  2. Cobra Jet Steering LLC

    Hot Restart Issue.

    ...starting the high side engine first and then move forward and try the low side because the forward movement would lessen the exhaust back pressure there are posts on this and oddly enough the low side engine started every time they moved the boat forward and I suspect you may have some...
  3. Cobra Jet Steering LLC

    Rough Idle Video

    Time to inspect ALL the clamps including all the exhaust hose clamps and remember to try to keep the reverse hood UP when being towed to reduce the back pressure of the water flowing through the pump and being pushed into the cooling line pickup.. If memory serves me correctly This advice was...
  4. Cobra Jet Steering LLC

    Hard (re)starting list-side engine (ballasted AR240, wake surfing)

    I believe if you start the higher engine and get the boat moving forward or to the side away from the low side and then try to start the engine it usually starts , the issue is INCREASED BACK Pressure on the low side exhaust
  5. Cobra Jet Steering LLC

    Overheat cause?

    Possible cause is increased back pressure on your exhaust system with the back of the boat sitting so low there are posts on this like why the low side engine won't start after they let it sit and having to get the boat going on the high side engine first, and then starting it when the boat is...
  6. Cobra Jet Steering LLC

    Water in oil AR230HO MR1 engine

    OK those were very popular steering systems, now my steering is so different and so effective plus there are many upgrades as well but I see a lot of people who still use that style, glad you are enjoying them. now I wonder what is causing water to get in your oil...
  7. Cobra Jet Steering LLC

    Surf Pipes for Yamahas invented yet?

    We discussed it on this site several years ago but I guess not, It was also discussed to prevent the low side engine from not wanting to start due to excess back pressure on the exhaust system...
  8. Cobra Jet Steering LLC

    Surf Pipes for Yamahas invented yet?

    That pipe is designed to create a vacuum and pull the exhaust out of the pipe using the water it is moving through to create a suction, as for jet boats they have the exhaust going out sideways aimed at the center of the boat in the pump opening not at the water behind the boat like prop boats...
  9. Cobra Jet Steering LLC

    Surfing / Engine Water Damage

    we have had numerous discussions about the low side engine being hard to start due to the increased backpressure of the exhaust system and the solution was to get the high side engine running and once the boat gets moving start the low side up because the back pressure is reduced and the...
  10. Cobra Jet Steering LLC

    2018 AR210 running rough below 3k RPM

    hmmm un hook the air box intake hose and see if it runs ok without the air filter in the game, also when you run it on the trailer how much water exits the muffler when you first start it ? If the engine giving you the trouble is holding more water that it needs it will create more back...
  11. Cobra Jet Steering LLC

    YAMAHA CERTIFIED WINTERIZATION PROCESS - MUST SEE

    The engines may self drain but the water boxes hold a lot of water, if they should freeze there is a possibility that the internal ice can break loose the baffles inside the muffler I have seen where engines created too much back pressure in the muffler due to a broken baffle and that caused...
  12. Cobra Jet Steering LLC

    Help on water! Starboard engine shut down

    Well you will probably need to limp back on one engine stay under 5 mph and position the reverse bucket up like in forward so it allows the water to flow through the pump easier and creates a lot less back pressure so you don't get water in the engine. Every few minutes just crank the engine...
  13. Cobra Jet Steering LLC

    195 cold start issues

    Odd that it does not do it on the trailer the main difference is the exhaust back pressure so I wonder if there is too much water in the water box "MUFFLER" I would be starting the engine on the trailer before putting it in the water and letting it run 10 seconds , then put it in the water and...
  14. Cobra Jet Steering LLC

    Help on water! Starboard engine shut down

    Throttle positioning sensor, wiggle the throttle while trying to start it. or kill switch pull out on the kill switch while trying to start it. If you were using it for wake surfing and it did that you will have to get the one engine running forward and try starting it with the boat level to...
  15. Cobra Jet Steering LLC

    2019 AR195 Water on spark plugs

    Interesting I wonder if your exhaust system has some sort of obstruction in it like a broken baffle. this reminds me of a situation a few years back when someone had issues similar to yours and of course changing the engine did not solve the problem with that either, it took a while to find the...
  16. Cobra Jet Steering LLC

    OK to start after running water in non-running engine?

    In order for water to get into the engine it must completely fill the muffler first and than back it's way up the exhaust system to enter the engine so it takes a few minutes depending on the water pressure.
  17. Cobra Jet Steering LLC

    Help - boat nearly sank, engines flooded

    Easy way to see of there is water in the tank is to let it settle and use a plastic hose , put it all the way down to the bottom of the tank and siphon some fuel out if there is water in it you will be sucking it out. place it in a clear container and let it sit if there is water you will see it...
  18. Cobra Jet Steering LLC

    Aargh... Milkshake Engine Oil... WTF? (Port Engine, 2016 AR240, ~300 hrs)

    @swatski I believe the previous discussions regarding the exhaust back pressure preventing the low side engine from restarting after sitting was pretty well proven when I suggested starting the high side engine only and then turning the boat away from the low side to get it up out of the water...
  19. Cobra Jet Steering LLC

    Aargh... Milkshake Engine Oil... WTF? (Port Engine, 2016 AR240, ~300 hrs)

    ...hours logged on it since that incident and no issues. Several things can cause the head to warp or crack one is excessive exhaust back pressure, I know of a Yamaha that had a baffle break in the muffler causing more that the correct amount of backpressure and eventually overheating the...
  20. Cobra Jet Steering LLC

    Hard (re)starting list-side engine (ballasted AR240, wake surfing)

    Hmm fuel injectors do not care about the Angle I thought we determined that if you start the top engine and get the boat moving justa few miler per hour this would relive some of the backpressure on the exhaust system and then you start the low engine once the boat is moving forward. I recall...
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