Primer kit on an SRX 700

Bomberfan said:
I can't seem to find anything wrong with the sled, that is why I am looking at primers.

Just to recap, you could tell how cold it was by how many pulls it took. When sitting for any amount of time, like overnight, at -10 it would take about 15 pulls.-20, around 25, and at -30 it took 46 pulls, trust me I counted.LOL.

Last season, compression was at 130 PSI across, the carbs were cleaned, power valves cleaned, carbs sync'd, choke cables adjusted and reajusted, new plugs set at correct gap, fresh fuel etc. I even bought a new fuel pump from Yamaha and still no luck.

So if anyone has a suggestion on what I may have missed, please let me know, otherwise I want to try a primer system, or maybe a pump from an SX as suggested.

I want to do or try whatever I can to make this next season a little easier on the shoulder.

Thanks for the replies!
Click to expand...

That is a lot of cranking! LOL! You'll need a recoil soon!
None of my Yamahas tripples or 4's have ever needed that much cranking!

If it starts as soon as you add fuel to the cylinders[thru sparkplug hole] its less likely to be ignition.

The choke circuits on our Yamaha flat slide carbs only work if there is adequate fuel in the float bowls.

Some things to check:
-float levels
-top hat filters under float chamber fuel inlet valves
-fuel lines for kinks or pin holes or air leakage at connectors
-fuel filter in tank and connection
-pump pulse line[any hole/crackss in this or connector leaks would make the fuel pump operate very poorly]
-fuel tank vent line...if this is plugged it would create a vacuum as the tank cooled and inhibit fuel flow
-reed cages...if the reed pedals are not sealing well or cracked ect you would get a week pulse to the pump
-bad crank seals could cause weak pump pulse as well

I know my ported and freshly rebuilt SRX[new everything!] would not pulse my stock SRX fuel pump very well[even tried a second pump] at recoil crank speeds but had no problem pulsing an SX700 pump...but again I don't know if that is typlical or just an individual isolated case!

Bob
 

sideshowBob said:
That is a lot of cranking! LOL! You'll need a recoil soon!
None of my Yamahas tripples or 4's have ever needed that much cranking!

If it starts as soon as you add fuel to the cylinders[thru sparkplug hole] its less likely to be ignition.

The choke circuits on our Yamaha flat slide carbs only work if there is adequate fuel in the float bowls.

Some things to check:
-float levels
-top hat filters under float chamber fuel inlet valves
-fuel lines for kinks or pin holes or air leakage at connectors
-fuel filter in tank and connection
-pump pulse line[any hole/crackss in this or connector leaks would make the fuel pump operate very poorly]
-fuel tank vent line...if this is plugged it would create a vacuum as the tank cooled and inhibit fuel flow
-reed cages...if the reed pedals are not sealing well or cracked ect you would get a week pulse to the pump
-bad crank seals could cause weak pump pulse as well

I know my ported and freshly rebuilt SRX[new everything!] would not pulse my stock SRX fuel pump very well[even tried a second pump] at recoil crank speeds but had no problem pulsing an SX700 pump...but again I don't know if that is typlical or just an individual isolated case!

Bob
Click to expand...
Thanks for all the suggestions, guess I have some work to do! However, I was planning on pulling the engine to inspect the harness(I did have some intermittent electrical problems last year), so this will be a good time to check these things out. However it did seem to start quickly when fuel was dumped through plug holes, so that is why I don't suspect any electrical problems either. If I can't find anything again then the SX pump sounds like something to try. Thanks again, Mark.
 
Same thing with mine

I have a 2000 that has started hard when cold (only) since I bought it 3 years ago. It has had the harness pulled out and every singe wire tested. This was to locate a problem that turned out to be a faulty stator. No difference in starting with the new stator. Dump fuel down the plug holes when it is cold and it will start right up.

So I agree with you that it can not be electrical, it has to be a fuel problem. The carbs have been rebuilt - no help.
 
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