Twin 48's - no primer or choke???

[showmepro1200]

one thing i thought about with straight lines to the carb vs using the switch is you can't shut off the fuel supply to the carbs while not riding. If it sits in the sun, I worried about gas tank pressure pushing on the carbs seats. not sure if it does anything bad or had any problems yet, (my ski is in the cool garage) but if the seats leak it can just run fuel into the cases. with the switch you can shut it off all together. something to ponder. doesn't wammer make something to run stock SN flame arrestors?

My thoughts exactly - I want the valve for (what I perceive is) positive shut off.

 

[D-Roc]

Just crack the cap when storing.

i do when i remember. i have personnally never had a problem but it always hung in the back of my mind. i don't need a reserve on my ski because i ride 90% flatwater on a river/lake and can stay close to the launch. i can tell when my ski starts sucking up a bit of air and is in need of fuel. i have run without reserve/switch for two seasons going on three and have yet to run out of fuel. knock on carbon .

 

[waxhead]

I believe that's a common misconception. With small carbs that may be mostly true, but not so much on skis with bigger carbs. Think about it this way. Even on brand new computer controlled cars fuel system enrichment is used during startup because the engine is cold and requires more fuel. It can be done through more fuel(primer) or less air(choke). Of course the engine management sytem takes care of all this, so you're not even aware it's taking place. A jetski motor is no different. Worse if anything since the fuel has a longer journey to reach the combustion chamber. Fuel doesn't evaporate as well when the motor is cold so you need more of it to maintain the air/fuel ratio needed to burn. If your modified boat always starts cold with no choke or primer you are likelier rich than perfectly tuned. And good luck w/o a primer if you ingest a little water and stall in the surf.:nono:

I would say the oppisite
If you ski doesnt start then your more than likely to lean
Lots of timing lots of fuel
Try it guys you will like it

 

[D-Roc]

i am going to try it this summer, dual 48's powerbombs on a 718cc with my msd total loss. probably not as much timing as you run but more than stock/msd enhancer.

 

[wydopen]

i have no primer and no problems...

 

[Superjet3]

i have no primer and no problems...

Agreed, if a motor is tuned correctly no primer is needed. However, in water ingestion cases, a primer may help a little.

 

[wydopen]

Agreed, if a motor is tuned correctly no primer is needed. However, in water ingestion cases, a primer may help a little.

true..usually when ive ingested water my ski is sunk so it dosnt really matter...ive rarley had my motor be wet and my ski still floating :banghead:

 

[motozachl]

Alright I need a little assurance here for what I am experiencing:

Carbs were not jetted properly (too rich) for my setup (789cc 62t/61x mikuni 44's)so changed them up to 115H 120L 95g 2.0needle. Well now it runs amazing and the plugs are nice and tan. My issue is that is doesn't seem to want to start without a primer, and then when it does start this happens and the motor runs away...

..when you shoot a bit of gas down the carb and fire the ski up it burns that fuel up first. sometimes the carbs kick in right away with the fuel from the tank, other times the primer shot burns up and the ski stalls or...it can go lean and run away....

When its got a load on it in the water, it seems fine though

 

[D-Roc]

Turn your low screws out to richer up the idle circuit

 

[motozachl]

Turn your low screws out to richer up the idle circuit

This didn't help

 

[D-Roc]

Can you try to hand choke your carbs to prime the fuel system on cold starts? You could have a air leak or you are a tad lean on your bottom end jetting for cold starts. My ski likes to idle high on cold starts until all the air bubbles are out of the lines.

 

[badvinny]

My ski starts great cold, I didnt want to have to install a primer but the primer is there because the 'lean runaway' can (and has) happen at anytime, especially when you do a jetting change!

 

[Matt_E]

My ski starts great cold, I didnt want to have to install a primer but the primer is there because the 'lean runaway' can (and has) happen at anytime, especially when you do a jetting change!

You don't have to use a primer to stop a runaway. There is a faster and much easier way

 

[badvinny]

really how?

 

[Matt_E]

Push & hold stop button and pull the throttle wide open. There is a thread in the Tech FAQ

 

[badvinny]

Dont know for sure if I agree as I have seen tethers off, plug caps yanked and still dieselling, but I will give you a maybe? I have always had good results priming the crap out of it if needed , but thanks!

Push & hold stop button and pull the throttle wide open. There is a thread in the Tech FAQ

 

[waxhead]

Dont know for sure if I agree as I have seen tethers off, plug caps yanked and still dieselling, but I will give you a maybe? I have always had good results priming the crap out of it if needed , but thanks!

Yeah but its running on like that because its running lean
the wot will stop that and then it will shut down like a normal engine

 

[Matt_E]

Dont know for sure if I agree as I have seen tethers off, plug caps yanked and still dieselling, but I will give you a maybe? I have always had good results priming the crap out of it if needed , but thanks!

Works every time. Stop button kills spark and throttle open kills the heat on the plugs with loads of cool air and fuel

 

[Waveblaster785]

People still use chokes?

 

[Tyrant1919]

Works every time. Stop button kills spark and throttle open kills the heat on the plugs with loads of cool air and fuel

He speaks from experience and so do I. Hold throttle wide open with stop button in and it will stop.