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k&N flame arrestor info
- Thread starter FlyingX4
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Dr Honda
Well-Known Member
It will if you don't re-tune the carbs.
The K&N filters are less restrictive than the stock airbox, and generally, your pop-off pressure will need to be lowered. If you bolt them on, without making carb changes, chances are, you will run lean, and burn a piston.
With that said... the stock airbox can flow more air than an 800 engine can use, so it's not a "Restriction" in the intake. So, putting on a set of aftermarket flame arrestors will not make anymore power on their own. Also, they provide ZERO protection from water ingestion. If you have water in the bilge, and roll the ski over... that water will go directly into the engine.
Unless you have other engine mods, and know how to tune 2-stroke engines... I recommend leaving the stock airbox on.
The K&N filters are less restrictive than the stock airbox, and generally, your pop-off pressure will need to be lowered. If you bolt them on, without making carb changes, chances are, you will run lean, and burn a piston.
With that said... the stock airbox can flow more air than an 800 engine can use, so it's not a "Restriction" in the intake. So, putting on a set of aftermarket flame arrestors will not make anymore power on their own. Also, they provide ZERO protection from water ingestion. If you have water in the bilge, and roll the ski over... that water will go directly into the engine.
Unless you have other engine mods, and know how to tune 2-stroke engines... I recommend leaving the stock airbox on.
FlyingX4
Member
Thank you, I was planning on bringing my machine to a seadoo dealer/ speed shop down the road from me to "jet" the carbs they have an employee who races the 787's x4s. I was told this was required when installing a flame arrestor. I also have the "wetsuit" for the filter which still provides air flow, and resists some water.
Dr Honda
Well-Known Member
I can only give my opinion, but I would never let anyone tune my engine. Proper tuning will require time on the water. (with a load on the engine)
Also, on an 800 engine, your carbs are mounted sideways, and the outerwear's dont really do anything other than protect the cotton filters from getting "Splashed". A real roll-over will allow the engine to drink the water. If that happens at high RPMs... you can bend a rod.
Now... if you tell me you are putting on a new pipe, and are having the carbs bored out, and raising the top RPM's to +7500... then the aftermarket arrestors will support those mods. But, on their own... there are no gains, or even positive reasons why to install open filters without other mods. It's simply a waste of money.
Just my 2 cents... take it for what it's worth.
I know that's not what you want to hear... but as above... don't let anyone else work on your ski. I would start with dropping the Pop-Off pressure to the bottom of spec (on an 800 that's about 25 psi) and I would open your high needles about an 1/8th of a turn.
Good luck
Also, on an 800 engine, your carbs are mounted sideways, and the outerwear's dont really do anything other than protect the cotton filters from getting "Splashed". A real roll-over will allow the engine to drink the water. If that happens at high RPMs... you can bend a rod.
Now... if you tell me you are putting on a new pipe, and are having the carbs bored out, and raising the top RPM's to +7500... then the aftermarket arrestors will support those mods. But, on their own... there are no gains, or even positive reasons why to install open filters without other mods. It's simply a waste of money.
Just my 2 cents... take it for what it's worth.
I know that's not what you want to hear... but as above... don't let anyone else work on your ski. I would start with dropping the Pop-Off pressure to the bottom of spec (on an 800 that's about 25 psi) and I would open your high needles about an 1/8th of a turn.
Good luck
Dr Honda
Well-Known Member
The jets are an OK place to start... but you originally had a 1.5 N/S... so if you pop that 2.0 in the carbs... you will wind up with a very low pop-off. If you keep the same spring... you are looking at about a 15 psi drop. It may be OK... but it may be too low. All I can say is to put them in, and check.
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My jet came with this K&N arrestor http://store.knfilters.com/search/product.aspx?Prod=59-2880. (I originally thought this was cool but am now doubting it after seeing your write up here)
I know it has 2.0s instead of the stock 1.5s as i recently rebuilt the carbs.
What should I be shooting for the pop-off to be?
I know it has 2.0s instead of the stock 1.5s as i recently rebuilt the carbs.
What should I be shooting for the pop-off to be?
Dr Honda
Well-Known Member
Can't say. Once you deviate from the factory settings... "Tuning" is not a black and white thing. As I said above... you have to spend time in the water, and tweak things as needed. If you don't... you can wind up with a roasted engine.
With a 2.0... I'd set it to about 20 psi, and go from there.
With a 2.0... I'd set it to about 20 psi, and go from there.
ltdyfz99
New Member
Trick was getting the lows and highs adjusted correctly that was it.
I went with 2.0, 147 highs, 70 lows about 30 pop off and the ski runs perfect, nice tan plugs after installing a Rossier exhaust.
To the OP, dump the K&N as Doc said. As soon as they get wet they will flow almost no air and you are on the water so there is nothing to filter out of the incoming air. You are also going to loose throttle response because of the way the carbs are from the factory on a stock ski you need a good vaccuum to keep them working correctly and if you install a more open intake system you loose this. The only reason ltdyfx99 is running them is because he has a modded ski and is turning more rpm's. Stick with the stock intake as DR. stated.
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