VIPER85
Lifetime Member
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- 39
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- Lisbon Falls Me
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- Snowmobile
- 2017 Sidewinder XTX LE
2008 Nytro RTX SE
2008 Phazer RTX
A guy I know bought a 14' Viper last year, we got talking about the hot start issue. He told me he had this issue with his almost as soon as he got it. He brought it back to the dealer and as we know they did not have a fix for this. He says he was sure it was an issue with heat because it would start until he let it sit for a while. I understand all of this is well known information now that the sled has been out for a year or so. He had them install a toggle switch opposite of his heated seat switch allowing him to turn the radiator fan on while the sled was off. He said he has not had an issue since. He says he turns the fan on for a minute or two after stopping trail side and it fires back up no issues since this was installed and being used.
Has anyone else thought or tried this method? Seems like it could be a very simple fix for a very annoying/embarrasing issue? Looking for everyones thoughts.......
Has anyone else thought or tried this method? Seems like it could be a very simple fix for a very annoying/embarrasing issue? Looking for everyones thoughts.......
DranttelSS
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- 2007 Yamaha Attak
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Just wait for the reflash, its coming within the next month
excallibur101
Pro
This seems like a common issue amongst most vipers I hear about.I am not a Viper owner although I can give you a little insight of some possibilities.Generally after the sled has ran for a while running at normal temps and then you shut it down the temperature of the coolant will rise to near its overheat point as there is no flow or cool air to drop its temperature .all the heat in the engine is being absorbed,.If you try to restart shorlty after shutdown your ECM gets signal from temp sensor reading it high,ecm wont allow starting till temp drops to its operating range.So a fan will definatly help this situation as well as this very important step,remove some of your antifreeze and add water to a 60/40 ratio,60% AF 40% water.Yamaha was using 100% antifreeze on their machines when they filled them,at that rate the antifreeze will retain the heat much longer at higher temps than thinning it out with water which would displace heat quicker due to its flow ratio.I had overheating issue like that when I bought my RXWARRIOR new in 2005,sled ran hotter than normal in powder conditions temp light would flash so I shut machine down ,it would not fire up after 5 minutes so I waited about 20 minutes or so it fired right up.Brought sled home tested antifreeze and found it was at 100% no mix.I drained some out added water and never had heat cycle issue ever again.You can go with a lower ratio of water if you feel freeze point is not adequite to where you live if you live in area where temps are usually below zero.Use antifreeze tester to do this step to avoid any issue.
Mine it only did it once on a warm day but buddies 7000 does it a lot even after sitting for 2 hrs in very cold conditions. Something is amiss but is not a consistent issue with a one solution fits all answer. I believe Yamaha will be making more than one change to ecu. Having fan run for 2 minutes after shutdown like many things do might very well be one of them since I believe ECU is in the fan circuit also.
excallibur101
Pro
Your ECM recieves signal from all sensors,and temperature is one of them,if its to hot it wont start.Straight antifreeze will retain a higher boiling point but will also take longer for the heat to dissipate,especially right after shutdown as their is no air flow to cool it down ,the engine is sweating its heat for that short period and antifreeze is sponging all of it causing the temp to increase for a period of time after shut downthen it will gradually cool down.
excallibur101
Pro
The fan is an excellent idea to help dissipate that heat during shutdown,many motorcycles and atv have them on the radiator as they are effective when there is no air flow ,temp, rises fan kicks on cooling it off.Think of it like a hot peice of meat coming off the grill ,you will notice with a temp guage will usually rise higher soon after you pull that meat off for about 5 minutes soon after,thats all the heat expelling.
No doubt. You are correct and checking antifreeze is a good idea but it does not explain why a sled won't start after two hours when everything including engine and radiator are cool to touch already.
excallibur101
Pro
Could it possibly be ECM resetting itself due to overheat signal ???? Remap may help to speed up process
My buddies with this issue the partial throttle trick always starts it. All I know is we should just be able to turn the key.
excallibur101
Pro
"excallibur101, Could it possibly be ECM resetting itself due to overheat signal ???? Remap may help to speed up process[/QUOTE]
Try disconnecting battery and reconnecting to to see if that helps if it becomes persistant.{resetting ECM}
Try disconnecting battery and reconnecting to to see if that helps if it becomes persistant.{resetting ECM}
excallibur101
Pro
Try disconnecting battery and reconnecting to to see if that helps if it becomes persistant.{resetting ECM}[/QUOTE]
I have done throttle trick as well and it did help {the Devil still lies in the hole}and the heat dissipation is the issue as this should not have to be done although it has worked,the ecm runs your engine from signal input of sensors telling it what to do,there is a cause to the problem and two of the solutions is mentioned on previous posts.
jetpilot785
Pro
- Joined
- Feb 8, 2014
- Messages
- 131
some good theories here but my question is, if it is part or most of the cause of the issue, even though you run the fan to cool the radiator down, all it does is cool the coolant in the radiator. You need to have circulation of the coolant in order to cool the engine block. All running the fan would does is allow cooler than normal coolant to enter the block shortly after startup but you would most likely still have a heat saturated engine to start and depending on where the sensors are located will depend on what they will read upon startup which will determine what the ecu will have for fuel mapping at that point. The coolant ratio that was mentioned is something to look into. I am now curious what mine is. I have been adding some water to the coolant as mine had the loose hose clamp issue and was leaking small quantities of coolant out all season long so I was rotating between coolant and water fills to keep the coolant level topped off. My girls viper didn't leak a drop of coolant all year so I will test both sleds to see where they are both at.
excallibur101
Pro
I have done throttle trick as well and it did help {the Devil still lies in the hole}and the heat dissipation is the issue as this should not have to be done although it has worked,the ecm runs your engine from signal input of sensors telling it what to do,there is a cause to the problem and two of the solutions is mentioned on previous posts.[/QUOTE]
If that does not help your situation you may have other issues the ECM is withholding.
stingray719
TY 4 Stroke God
excallibur101
Pro
By cooling the radiator it will gradually drop coolant temperature as is dissipates through system.There is no coolant circulating correct so there is still hot coolant through engine but the fan does help to relief the heat starting at the radiator cooler air absorbing the hot,sometimes just turning engine over will help circulate the water.Keep in mind make sure your water/Antifreeze mix are with par .do not add mostly water as it will crack the block if it freezes.the balqnce of mix must be right.A hydrameteter works best.
