09Griz700 Start Problem (141 miles) - Yamaha Grizzly ATV Forum
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post #1 of 9 Old 05-20-2019, 12:03 PM Thread Starter
 
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09Griz700 Start Problem (141 miles)

Been awhile since I looked at this great website. Can use some of your expertise on my recent find;
Just bought an 2009 700 Griz FI EPS with 141 miles on it.... yes 141 miles. Unit sat in storage for 8+ years and now it's needing minor help to get going again.
I've installed a new battery, pulled and cleaned the fuel pump & intake filter sock, changed gas, cleaned plug and have ordered service manual. Also read all I can online for this model....
Problem: Turn key on and gas pump runs until pressure is met then stops. Hit starter button and engine runs maybe 5 sec then dies and wont restart. When trying to restart it has, backfired into intake box...? Seems to almost start (5sec) best after sitting overnight, but wont after the initial morning try???

I've read about Fuel Injection relay, angle relay, and trying to figure out why it wont continue to run? I did pull the fuel line and ran another line off pump into a gas can, then ran the pump to insure it's pumping. Pump runs for maybe 5sec then stops (this on open hose in can), turn key off then back on and pump runs again for 5 secs putting out plenty of fuel but doesn't continue to run.
Appreciate and input or ideas on getting this Griz running again. Figure it's a minor electrical problem with a sensor or relay?

Last edited by Hrlyguy; 05-20-2019 at 02:46 PM.
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post #2 of 9 Old 05-20-2019, 04:24 PM
 
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First thing first, replace the spark plug. They fail more often than you think.
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post #3 of 9 Old 05-20-2019, 09:15 PM
 
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Mine does the same thing when the plug needs changed so X2 on start with a new plug they are cheap and probably needs one even if it doesn't fix your problem.
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post #4 of 9 Old 05-21-2019, 03:39 AM Thread Starter
 
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Had to order a couple new plugs from my local Auto parts, so we'll try a new one tomorrow.
Printed out all the Self-Diagnostic codes so can play with that also.
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post #5 of 9 Old 05-21-2019, 08:26 AM
 
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Cleaning a plug has not been found to work, there can be visible spark to the eye with that spark not hot enough.
If you can once it is going, take it for a ride and get it hot before shutting off the engine. The engine may not be fully broke in yet. Yamaha valves are known to stretch slightly in the first 1000 miles requiring the valve lash to be checked and re-set on many grizzlys.

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post #6 of 9 Old 05-21-2019, 09:01 AM
 
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Could be a bad fuel pump. Most fuel pumps have built in thermo overload protection.
Try removing all ECU and relays from the equation by hot wiring the fuel pump to a battery to see if the flow stops after 5 seconds. If it still does it its probably the pump.

I haven't posted this information yet.. ..but some research has lead me to believe that most of the stalling attributed to "fuel boiling" or vapor lock is caused by the this thermo overload protection. It happened to me last fall out in Colorado. Until this time I have never had a stalling issue. With no indication of a problem my Kodi died after climbing a grade for several miles. Wouldn't re-start. Opened the fuel tank no boiling. Had just about a half tank of fuel. I remembered that some others reported that if they add a couple gallons of ambient temperature fuel their machines started right up. I add two gallons of fuel the rig fired right up and didn't act up again.
Partially because some other riders, that bought fuel at TP, machines did the same as mine but at the bottom of the mountain. The rest of the week I was blaming lousy fuel at Taylor Pass resort for the issue.
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post #7 of 9 Old 05-21-2019, 07:08 PM Thread Starter
 
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Well Old Dogs can learn new tricks.... original plug with 141 miles on it looked good and had spark, but I'm now a believer in always trying a new Spark Plug first! I put in a new NGK LMAR6A-9 and the 700 Griz fired right up... a bit of uneven idling as it hadn't been started for years, and a bit of exhaust smoke while warming up (understandable). Once all seemed OK I slowly throttled it up a couple times and took it for a ride. All engine, electrical and running gear items seem to work properly. I'm very very happy with my new toy @ $3500.
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post #8 of 9 Old 05-22-2019, 11:28 AM
 
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Quote:
Originally Posted by Hrlyguy View Post
Well Old Dogs can learn new tricks.... original plug with 141 miles on it looked good and had spark, but I'm now a believer in always trying a new Spark Plug first! I put in a new NGK LMAR6A-9 and the 700 Griz fired right up... a bit of uneven idling as it hadn't been started for years, and a bit of exhaust smoke while warming up (understandable). Once all seemed OK I slowly throttled it up a couple times and took it for a ride. All engine, electrical and running gear items seem to work properly. I'm very very happy with my new toy @ $3500.
Sweet! What a deal! Pretty much an old/brand new 700 Grizz for 3500! Awesome.

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post #9 of 9 Old 05-27-2019, 12:21 PM
 
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Quote:
Originally Posted by Hrlyguy View Post
Well Old Dogs can learn new tricks.... original plug with 141 miles on it looked good and had spark, but I'm now a believer in always trying a new Spark Plug first! I put in a new NGK LMAR6A-9 and the 700 Griz fired right up... a bit of uneven idling as it hadn't been started for years, and a bit of exhaust smoke while warming up (understandable). Once all seemed OK I slowly throttled it up a couple times and took it for a ride. All engine, electrical and running gear items seem to work properly. I'm very very happy with my new toy @ $3500.
What a steal. I'm some what jealous. Lol. Congrats on the new bike.

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2015 Yamaha Grizzly 700 EPS SE All stock with a 2500lb Warn Winch
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