2000 Vmax 500 - Has Fuel, Comp & Spark but still no start???

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Grizzly1200

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Nov 28, 2025
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Okay I feel dumb even asking but what am I missing here. Recently picked up an old Vmax from the original owner with 1000 original miles. Been sitting for the last 5 years for sure. I can’t get this thing to pop off for the life of me. Both cylinders have 136 psi, I have great spark on both cylinders, and it won’t fire off spray or dribbled directly into the plug holes. What bone head thing am I missing? I figured I’d at least get a cough with the combustion trio? Help please! Trying to save some old iron from the scrap heap.
 
Is the pipe packed full of mice bedding? or air box. Get the old gas out of it.. I tried getting one to pop and the bowls had such crappy gas in it from sitting it wouldn't fire until I cleaned the carbs completely then it fired with one pull.
 
Well guys I got something figured out, but it seems like each new door leads to a new problem. No mouse houses, but when I pulled the carbs both bowls were FULL of injector oil. The fuel pump was packed solid with injector oil, basically everything tank down. Took it all apart, cleaned it, put everything back together and it started and ran like a champ. Rode it around the yard and it filed beautifully. Let it sit one day, and sure enough would start again no matter how much spray I gave it. Took the carbs apart again and alas, same story. Everything packed with injector oil. Does it not have any system to stop or restrict the flow when it’s not running? I can’t figure out why it wants to drown itself in oil….
 
x2 on what mrsled said. for a cheap fix to get it going, put a fuel shut off in the oil line from the tank to the pump. just need to remeber to shut it off when parking for extended periods. of course make sure you turn it on when running. the valve on the pump might come back around with fresh oil flowing past it at some point.
 
just had thought, if you put a fuel shut off in oil line, make sure you put one in the gas line as if both are shut off, you cannot do damage as sled will not run.
 
At this point I don’t know what to think anymore. Let it sit a week outside, dragged it back into the shop with the tractor and it fires right up every time. I want to believe I just ran enough good fuel through it to rehydrate the pump diaphrams, but it can’t be that simple. It definitely starts 1000 times better in the warm shop than outside, but what doesn’t?
 
Grizzly1200 said:
At this point I don’t know what to think anymore. Let it sit a week outside, dragged it back into the shop with the tractor and it fires right up every time. I want to believe I just ran enough good fuel through it to rehydrate the pump diaphrams, but it can’t be that simple. It definitely starts 1000 times better in the warm shop than outside, but what doesn’t?
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Then the choke is not working.
 
MrSled said:
Is the pipe packed full of mice bedding? or air box. Get the old gas out of it.. I tried getting one to pop and the bowls had such crappy gas in it from sitting it wouldn't fire until I cleaned the carbs completely then it fired with one pull.
Click to expand...
I take a plug out and give it a big splash of chain saw mix , it fires right up for 5 seconds . repeat untill it keeps running
 
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