y srx hard to start and not vipers

PhatboyC said:
Not sure how accurate it is but after adding 20 liters of gas before my first start of the season my gauge showed 3/4 full...still had a hell of a time. Not sure if a full tank would help. I'm sure a primer would of.



Did you try this sideshowBob? Your first theory would be more align from what others experienced.

Just so this thread doesn't get side tracked. We are talking about starting it after a long rest here.
Click to expand...


Originally this post was just talking about SRX's hard to start period. Sitting for a long period of time definitely makes it worse but this is normally the case with anything. Mine can sit over-night and be difficult to start. Like 15-20 pulls.
 

Well so far on my new to me 01 srx... its a charm to start.... it takes about 4-5 pulls when its been sitting over night... no more no less..

It hasnt gotten overly cold out so i dont know how it will react... when its been sitting in the wind and its cold as hell out... but I dont think im too worried...
 
sideshowBob said:
TTT
I still have not started mine with the new fuel pump + loop elliminated but I will update soon.
Click to expand...

Hey Slideshow, as per your other post on the TPS, I wonder if hard starting could have anything to do with the TPS? Let us know how you make out with your hard starting issues.
 
UPDATE:
I have almost completed the offseason overhaul on my SRX[just waiting for a couple parts]
-fuel tank, lines, and carbs completely dry
-I installed the new Fuel Pump[no hole in bottom]
-elliminated fuel loop from tank to pump
-poured 5 gallons of premix in fuel tank

Intitially I left the carbs off to see how fuel flowed from pump:
-fuel was definately gravity feeding to fuel pump
-no fuel passing thru the pump when sitting static

I then pulled the engine over to watch for fuel pump action:
-no fuel flowed from fuel lines!
-checked pulse line - OK
-Checked fuel supply to pump - OK
-pulled engine over with + without plugs - NO FUEL FLOW FROM LINES!
-reinstalled old fuel pump - SAME THING-NO FUEL!
-put a fuel pressure guage on pulse line - when pulled over 2 - 4 psi
-reinstalled new pump
-installed carbs but left fuel lines off

I then decided to do just a short start on it as the pipes + power valves are not installed yet but everything else is completed:
- put a couple of ounces of premix done the spark plug holes
-gave it two pulls and it started right away
- it pumped fuel like mad out of the fuel lines until it quit
-pulled it over a few times and again - NO FUEL FLOW!

Conclusion:

On my SRX the pumps I have require more pulse action then the recoil can provide to flow fuel.
If the pump + lines + carbs are dry, no amount of hand cranking is going to fill those float bowls up! Fuel down the cylinders is going to be required to start it + provide enough pulse to run the pump.

Questions:

-My engine is trail ported[has been for a couple years], has this worsened an issue with crankcase pulse?
-I have after market reeds with spacers, again has the crankcase volume increase caused some issues?
-Is this an issue that only shows up on ported Engines or do the stock SRXs have this condition as well.

When I installed an SRX fuel pump on our Piped/Ported SX700 it developed a starting issue after a long sit as well, our other identical SX with its stock pump is much better
-Is this purely a fuel pump Issue?


I have seen on a previous post that someone installed a primer bulb in the fuel line...maybe I will do that as well, that would alleviate this issue on my sled.

Things that make you go HMMMMM ! Keeps it interesting!
 
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Good info there sideshow....I had over a half of a tank of fuel on mine this year when I tried to start it for the first time and I took about 35 pulls to get it going!!! I have a stock motor srx 600. Mine has always been a bear to start when it is cold out or a week has passed. When it is -15 to -20 it may take 30 pulls to get it going. After the first start. Bang 1 to 3 pulls even if it sits for 5-6 hours out in the -15 to -20 temp. If it is warm 1st pull ever time after it has been run. If I let it sit for a week I am looking at 10 pulls in a garage with it 50 degrees. I think it is the nature of the beast. I have often wondered what a primer would be like. It sure would be nice to pump it ten times and have it start 1-2 pull.......nothing like dreamin ;)!


Oh when I bought my sled it had a shut off in the line between the tank and the fuel pump. I have since removed because I noticed no difference between using it and not........no matter what, it is always a bear.
 
sideshowBob said:
UPDATE: -

Conclusion:

On my SRX the pumps I have require more pulse action then the recoil can provide to flow fuel.
If the pump + lines + carbs are dry, no amount of hand cranking is going to fill those float bowls up! Fuel down the cylinders is going to be required to start it + provide enough pulse to run the pump.

Questions:

-My engine is trail ported[has been for a couple years], has this worsened an issue with crankcase pulse?
-I have after market reeds with spacers, again has the crankcase volume increase caused some issues?
-Is this an issue that only shows up on ported Engines or do the stock SRXs have this condition as well.

When I installed an SRX fuel pump on our Piped/Ported SX700 it developed a starting issue after a long sit as well, our other identical SX with its stock pump is much better
-Is this purely a fuel pump Issue?


I have seen on a previous post that someone installed a primer bulb in the fuel line...maybe I will do that as well, that would alleviate this issue on my sled.

Things that make you HMMMMM ! Keeps it interesting!
Click to expand...


I'll be bottoning up mine this weekend (been waiting on donuts) and may be able to answer the question of stock vs. modified re: pulse strength. Stock everything including the fuel line loop.
 
***UPDATE 2:***

sideshowBob said:
I have almost completed the offseason overhaul on my 2002 SRX[just waiting for a couple parts]
-fuel tank, lines, and carbs completely dry
-I installed the new Fuel Pump[no hole in bottom]
-elliminated fuel loop from tank to pump
-poured 5 gallons of premix in fuel tank

Intitially I left the carbs off to see how fuel flowed from pump:
-fuel was definately gravity feeding to fuel pump
-no fuel passing thru the pump when sitting static

I then pulled the engine over to watch for fuel pump action:
-no fuel flowed from fuel lines!
-checked pulse line - OK
-Checked fuel supply to pump - OK
-pulled engine over with + without plugs - NO FUEL FLOW FROM LINES!
-reinstalled old fuel pump - SAME THING-NO FUEL!
-put a fuel pressure guage on pulse line - when pulled over 2 - 4 psi
-reinstalled new pump
-installed carbs but left fuel lines off

I then decided to do just a short start on it as the pipes + power valves are not installed yet but everything else is completed:
- put a couple of ounces of premix done the spark plug holes
-gave it two pulls and it started right away
- it pumped fuel like mad out of the fuel lines until it quit
-pulled it over a few times and again - NO FUEL FLOW!

Conclusion:

On my SRX the pumps I have require more pulse action then the recoil can provide to flow fuel.
If the pump + lines + carbs are dry, no amount of hand cranking is going to fill those float bowls up! Fuel down the cylinders is going to be required to start it + provide enough pulse to run the pump.

Questions:

-My engine is trail ported[has been for a couple years], has this worsened an issue with crankcase pulse?
-I have after market reeds with spacers, again has the crankcase volume increase caused some issues?
-Is this an issue that only shows up on ported Engines or do the stock SRXs have this condition as well.

When I installed an SRX fuel pump on our Piped/Ported SX700 it developed a starting issue after a long sit as well, our other identical SX with its stock pump is much better
-Is this purely a fuel pump Issue?


I have seen on a previous post that someone installed a primer bulb in the fuel line...maybe I will do that as well, that would alleviate this issue on my sled.
Click to expand...

***UPDATED INFO:***

Today I drained all the fuel from my sled again[2002 SRX]:
- checked the fuel filter - OK

Reinstalled stock fuel loop:
-had to add @7 imperial gallons[@28 litres/@9 us gallons] in my sled before fuel would gravity flow from fuel loop.

Installed 1999 SX 700 fuel pump[no vent hole in bottom, fittings all the same, + looks identical externally to SRX pump except it does not have rubber X-over line]:
-pulled sled over with recoil - instant fuel flow from all fuel lines!
-reinstalled New SRX fuel pump...still no fuel when pulled over!

Conclusion:
-either I am getting dud SRX fuel pumps or they require a fairly strong pulse to operate
-I have installed the 99 SX700 fuel pump and will be using it[it operated fine on our SX when it had a Bender 800 BB kit with TMX 38s]
-reinstalled stock fuel loop and when the sled has sat for a long period I will make sure I have more then 7 gallons in the tank so fuel can gravity feed!

Additional Info:

I hooked up a primer bulb from a boat tank to one of my hand held SRX fuel pumps to see how fuel would flow thru the pump:

-when bulb was squeezed fuel came out the oil line fitting only.
-if I held my thumb over the oil line fitting and squeezed the bulb, fairly hard, fuel would VERY reluctantly flow from the fuel line fittings

Hope this info helps...do with it what you may!! LOL!

Things that make you go HMMMMM ! Keeps it interesting!
 
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well.. when I emptied my bowls and lines... all I did was pull it over while holding the thorttle wide open... after 8 pulls it started... and the gas tank was at 1/4.. was I just luckey... or does holding the throttle open when the carbs are empty help?
 
The loop in the fuel line is not a problem, once the line is full if you disconect it from the pump the tank will drain completely even if the fuel level is below the highest point of the line. Just like when you syphon liquid with a simple hose. In fact the fuel gooing down compensate for the fuel gooing up and pulls it. So loop has no effect at all. I think it is there to avoir pulling air in the case the tank shakes a lot.
 
JerT2 said:
once the line is full if you disconect it from the pump the tank will drain completely even if the fuel level is below the highest point of the line. Just like when you syphon liquid with a simple hose. In fact the fuel gooing down compensate for the fuel gooing up and pulls it..
Click to expand...

Good point...where the problem with the fuel feed would be is after the fuel tank has been drained, the sled has been run out of fuel,or any time the fuel line has become void of fuel. In these cases, you would need enough suction from the pump to restart the "syphoning effect" or you would need the fuel level above the top of the fuel feed line loop to refill/restart the flow from the tank to the pump. Something that would not be uncommon in the fall or after a long sit.
 
Ride.Race.Live said:
well.. when I emptied my bowls and lines... all I did was pull it over while holding the thorttle wide open... after 8 pulls it started... and the gas tank was at 1/4.. was I just luckey... or does holding the throttle open when the carbs are empty help?
Click to expand...

Interesting. I will have to wait until next year to try this. Like most here, after mine is started for the season is all good. Tops 7-9 pulls after a week or two.

Anyone can comment if choke plus opening throttle can help for first start of the winter?
 
PhatboyC said:
Interesting. I will have to wait until next year to try this. Like most here, after mine is started for the season is all good. Tops 7-9 pulls after a week or two.

Anyone can comment if choke plus opening throttle can help for first start of the winter?
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Well normally in my experience holding the throttle open would make the problem worse. If you have an engine that is flooded with fuel you can hold the throttle open with choke off and that will clean it out. Basically when you open the throttle you are allowing more air in to the engine making the fuel mixture lean.
 
Basically when you open the throttle you are allowing more air in to the engine making the fuel mixture lean.
Click to expand...

yes but youre also allowing more air to be drawn into the engine, maybe this creates more pulse for trhe fuel pump, dont know, throwing it out there for someone who knows how the pulse line works
 
When I was "experimenting" with mine, there was no difference in the pulse strength with or without the plugs in, when I was pulling it over with the recoil.

I had not really thought of it before now but... the crankcase pulse pressure is a direct result of the pumping effect of the downward movement of the pistons, independant of cylinder compression.

Someone earlier in this post stated that he cranks his sled over with the plugs removed a few times before trying to start it...not a bad idea because its easier to pull over and should result in the same fuel pump action to fill the float bowls.

JM.02c
 
hey

I had a 1998 SRX my last sled jetted rich, and if you didn't choke it right and you pulled over 3 times somethings wrong...it took a while to figure it out...but usually kept the choke on pulled 3 times started right up feathered the choke a bit then took off blurping the throttle till it warmed up...and when i stopped I never left it there idling shut er right off...and used the good plugs...after I got the hang of that never had a problem

My 2001 SRX...usually starts right up 1 pull 3 max depending on temp..
After along summer storage...put fuel in each cylinder and first pull...You just have to find your SRX temperment...

I think usually It has a lot to do with how it's jetted and how you start it with the jetting that's in it...
 
sideshowBob said:
Someone earlier in this post stated that he cranks his sled over with the plugs removed a few times before trying to start it...not a bad idea because its easier to pull over and should result in the same fuel pump action to fill the float bowls.JM.02c
Click to expand...

Well if you have the plugs out might as well put some gas in the cylinders. Should start first pull.
 
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