difficult cold start

[ontariosledder]

06 venture, if my sled sits 2-3 weeks it wont start without quick start. idles nice runs good re starts good. starts the second day no problem. thought?
thanking all who reply
OS

 

[4strokeluvr111]

Not sure how best to explain this other than your carbs are losing their "prime". Fuel has evaporated out of the bowls and the fuel pumps have a fairly big job to fill them again. To help speed the process remove the fuel tank vent tube from the frame fitting located about 3-5" higher than your left toe would be....under the hood. Blow into the tank vent and pinch the hose shut. Turn the engine over. If it doesn't start after 5+ seconds, repeat the process. Has never taken me more than 2X to get the engine to fire.

Lots of threads on this subject out there. "No engine start after storage".

 

[J1635]

start with the gas cap off, airlock

 

[mooseflyer]

4SL111 has it. Common issue. Blow in the tube and problem solved.

 

[smokingcrater]

start with the gas cap off, airlock

The tank is vented to atmosphere already... Opening the cap doesn't do anything other than potentially let dirt in to plug up your carbs.

 

[yank]

The float bowls on these sleds sit right over the slanted engine block, with residual heat causing excessive evaporation of fuel through the oversize vent tubes. I stuffed 1/8" tubing inside the 1/4" vent lines to slow down the evaporation on my 05 venture, and it seems to help. For the first start of the season I pop a fuel line off the pump and fill the float bowls using a small funnel. Starts instantly after this.

 

[J1635]

The tank is vented to atmosphere already... Opening the cap doesn't do anything other than potentially let dirt in to plug up your carbs.

#1 - No actually, a kinked or blocked tubing line which is extremely plausible could stop that

#2 - next time it happens, try it and tell me what happens. youll laugh. the fuel needs to prime to flow, if the hose is kinked its restricted. its the same as blowing in the tank through the vent line which has worked for many a member here, taking the cap off is just easier so you dont have to suck on a vent line

 

[smokingcrater]

#1 - No actually, a kinked or blocked tubing line which is extremely plausible could stop that

#2 - next time it happens, try it and tell me what happens. youll laugh. the fuel needs to prime to flow, if the hose is kinked its restricted. its the same as blowing in the tank through the vent line which has worked for many a member here, taking the cap off is just easier so you dont have to suck on a vent line

A kinked/blocked vent line would have much worse issues than hard starting...

 

[ontariosledder]

ok, i will look into this no start after storage posting, but the idea of blowing on a fuel line is just too funny i will never hear the end of that one, once my none Yamaha buddies hear of this.how about an inline marine primer ball? that would do the same thing.
thank OS

 

[Yamadooed]

Clean and check carb settings.

 

[Vornec]

I have the same issue with my 06 venture. Any idea where to get an in line primer bulb? Having grown up on late 80's Skidoos with mikuni carbs that had a primer, it is insane to me that any carbureted engine would be missing this convenient feature. I would like to add it to my venture.

 

[ontariosledder]

Vornec, im thinking Yamaha marine, the dealer might have some advice. its worth asking. If you get a chance to try it before me , let me know how it works' thanks
O/S

 

[4strokeluvr111]

Doesn't a primer bulb, when it's not being pumped, "stay closed"? If so, this eliminates the possibility of using one on the fuel tank vent hose.

1000's of us Yam 4S owners have "blown the fuel line". Personally I use a small, very small shot of compressed air. I don't think I'm less of a man for doing it. If your Yamaha buddies have carb'd 4S', ask them how they do it?

Waiting for answer........

 

[J1635]

Doesn't a primer bulb, when it's not being pumped, "stay closed"? If so, this eliminates the possibility of using one on the fuel tank vent hose.

1000's of us Yam 4S owners have "blown the fuel line". Personally I use a small, very small shot of compressed air. I don't think I'm less of a man for doing it. If your Yamaha buddies have carb'd 4S', ask them how they do it?

Waiting for answer........

yeah they have a checkvalve in them so it wont work.

honestly the ONLY time i needed to blow into my vent line was when i pulled the engine to do my chaincase tensioner and i had drained the fuel lines and the tank to change the fuel filters, upon reassembly it wouldnt fire so i blew in the vent line and after about 5 seconds it started.

due to our #*$&@ weather here this season i havent been riding as much, warmer then normal temps, so the sleds been sitting longer. I hadnt driven it in 2 weeks, went to start it and nothing, starting over and over and wouldnt fire. im thinking wtf, literally unscrewed the gas cap completely, turned it over again and it started within a second.

next time this happens to someone just try taking the cap off, that 3/16 vent line just cant supply the proper air if its been sitting for awhile, it just get a vapor lock in it, regardless of what anyone else on here thinks im saying this worked perfect for me and no more giving head to my fuel lines. (im staring at you smokingcrater) :|


anyone knows the effect you get when you empty a jerrycan of gas without the vent open fully, gluggg gluggg gluggggg, just picture your fuel tank doing the same thing, the fuel lines are what 5/16 - 3/8? couple that with the suction action from the motor, that 3/16 vent stubout just cant compensate for vacuum thats being pulled. now throw in a bit of crap at the bottom of the vent line or a sharp turn causing a bit of a kink, now that 3/16 is 1/32.

 

[Vornec]

I have tried it with the cap off, thinking vapor lock, but no luck.
This fall I got a little too excited with the starting fluid and burnt up my air filter, so if I have to get a little personal with my fuel line I will. Anything is better than flames jumping out of my airbox. Now THAT was embarrassing!