Viper S starts hard - Insight?

xsivhp

xsivhp

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Viper S starting hard - needs choke to start even if only been sitting for an hour after being run hard in temps of 10-40 degrees - have to pull over like 8-10 times - does anybody know what could cause this?

Thanks,

xs
 

Mine starts a little hard also. Cold engine- 7-8 pulls, Warm engine- I have to hold the throttle open a touch and it will usually start 1st or 2nd pull(deffinitly worse in warm whether)
Comparing that to my SRX that has always started 2-3 pulls cold( unless its like 5 degrees out, then it may take 4-5)
 
I always have to crack my throttle a little to start mine when its warm , I think thats a yamaha thing , I had two older Vmax's that needed to be gassed a little to start also . But i never have to choke them when warm .
 
The Viper engine should not start that hard. I would go through the carbs thouroughly and also the fuel supply system (pickup, vent, hoses, pump). However, the hardest time is when it is partially cooled (setting an hour or 2 in warmer weather). You can "choke" it just before shutting it off if you know it will be sitting for an hour or more. I do this when I stop for lunch, and it helps a lot.

They should start in 3 pulls cold, and first pull warm if adjusted properly. Again if partially cooled it may take more pulls, as it is hard to get the right amount of fuel vaporization when you don't really know the temp of the engine. I suppose if you calculated how long it has sat, and the air temperature and density, you could get it to start easier but usually I have pulled a couple times before I think about how warm the engine might be.
 
Mine is an 04 ER and it starts pretty hard after it sits for an hour, just an hour or so. Especially if it was ridden hard before it sits. Longer or shorter it is better. I have found that rather than the choke, the throttle about 1/4 open and it usually fires right off. I realize there is no comparison between my key turning and pulling a rope.
 
Yah, I use the throttle quite a bit when starting. However, it is definitely by feel and something you need to get the feel of for it to be effective. Hard to explain, but if you have messed with a lot of engines you can "feel" whether it needs more gas, more air or both. Part of the "feel" is hearing the sound it makes as you pull it over. It will be different depending on what is going on fuel mixture wise in the engine. On snowmobiles it is usually hard to hear because you usually have a helmet on, and other sleds may be running near you.
 
My other 04 Viper S had no problems - a little gas and a quick pull she'd fire right up. Not so with this one. Would the pilot jets affect this?
 
Cleaned my pilot jets and my Viper started better than when it was new (1st or second pull, or just barely touch the electric start key). I think my pilots were a little clogged when I bought it and the cold idle just got worse until it wouldnt idle at all. I would have done it earlier but Im ignorant when it comes to carb stuff.
 
here's the routine after we stop somewhere - pretty much no matter the length of time we're there or the temp:

1: crack gas 1/4 throttle pull
2: repeat #1
3: repeat #1
4: repeat #1
5: full choke, pull
6: repeat #5
7: repeat #5
8: choke off, 1/4 throttle - almost starts
9: choke, starts

Am I just flooding it or ?? ??

Thanks!
 
After riding do you let the idle come down before you shut it off? If you don't it will load up and be hard to re start. Before you shut it off let the idle come down then shut it off. It works every time on mine. After an hour of sitting it starts first pull with a little throttle. If it sits a bit longer I have to give it a little choke. Cold alway's starts 3rd pull.
 
i usually do let it idle down - the thing that boggles me is my other Viper S never had a problem with it.
 
Ding said:
Yah, I use the throttle quite a bit when starting. However, it is definitely by feel and something you need to get the feel of for it to be effective. Hard to explain, but if you have messed with a lot of engines you can "feel" whether it needs more gas, more air or both. Part of the "feel" is hearing the sound it makes as you pull it over. It will be different depending on what is going on fuel mixture wise in the engine. On snowmobiles it is usually hard to hear because you usually have a helmet on, and other sleds may be running near you.
Click to expand...

I COMPLETELY agree with this. Once you know your engine, you know what it needs to be happy :2strokes: That being said, i would look into your carbs and see what you've got for pilots, fuel screw settings, and float adjustment. Bet you will find something in there making it a hard starter.
 
do any of you have a problem with starting the sled after a break (lets just say one hour), i can start the machine with 1/4 throttle and a little blip. if i dont 1/4 throttle and "blip" the sleed will die and then the pulling begins (sometimes upward of 20 pulls). It acts as if it looses the prime of the fuel pump or something. The sled is tuned very well and runs perfect. (normally i can control the starting of the machine very well, its when someone else gets on that doesn't know the procedure that it really is a problem) they pull the cord and it will start then die because they didnt "blip" the throttle, well then its a pita to get going...usually full choke for 6-10 pulls and its fine. anybody else?
 
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