2005 Grizzly 660 warms up then cuts out

[Ghost420guy]

I bought a Grizzly 660 not very long ago, it has engine mods as well as a new pipe to breath through. I've noticed I can't ride for much longer than 30 min before the machine starts cutting out, if I let it sit and the motor gets cold it will run just fine again until it re-warms up. I replaced the water pump workings and seals as well as flushed the radiator and given fresh coolant, the spark plug is a perfect shade of brown so I know that the motor is running as it should. I didn't have this issue before putting the pipe on but can't see how the pipe would cause this. Any thoughts or help on this issue is greatly appreciated

[rappy97]

Thermostat?

[Ghost420guy]

That's one thing I haven't checked Rappy, I'd think if stuck open it shoud over cool the motor tho and not start cutting out after 20 min of hard riding. the fan engages and shuts of jus fine as well

[oxidized_black]

how about the temp sending unit if its got one? i think if its getting too hot now, and you just had the new water pump installed, maybe it's that. i hate to say it though ...

you can always get a bigger rad too, and get longer oil lines and curl them ...

[Ajmboy]

Does it start to buck while riding or does the idle sink lower and just stall out?

[Ghost420guy]

It bucks a lil while riding after warmed up and will stall out if i get off the gas but will idle fine, it's got (according to the local shop) a 180 main jet. The jet is a guess since its a lil hard to read, but looked spot on compared to a new one.

I have been thinkin bout the radiator idea myself as well Ox, jus tryin to find a slightly cheaper alternative

[Ajmboy]

With the modifications, you may need to go with a larger, maybe 190 main jet. What does the pipe manufacturer recommend?

[Ghost420guy]

I bought the pipe ebay and it came with no recomendations or paperwork for that matter, I was thinking about goin to a 190