I recently bought a 2008 Yamaha Grizzly 450 for a steal, but there’s a catch—the previous owner messed with the timing, and now it’s struggling to start. I suspect the timing is off, and I need to get it checked and possibly adjusted. Does anyone have a step-by-step guide or tips on how to check and correct the timing on this model? Any help would be greatly appreciated!
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The image is a diagram from the factory service manual for the 2008 Yamaha Grizzly 450, illustrating the process for checking and adjusting the ignition timing. It shows the positions and components that need to be inspected, including the stationary pointer and firing range on the flywheel. This visual guide is crucial for accurately verifying the ignition timing to ensure the engine runs smoothly. Make sure to follow these detailed instructions to avoid issues like hard starting or erratic engine performance.
Source: Factory Service Manual
To check the ignition timing on a 2008 Yamaha Grizzly 450, first ensure the engine idling speed and throttle cable free play are properly adjusted. Then, remove the seat and right-side fuel tank panel. Attach an inductive tachometer and timing light to the spark plug lead. Warm up the engine to the specified speed (1,450-1,550 RPM), and visually check the stationary pointer on the flywheel. If it’s not within the required firing range, you may need to inspect the pulser coil assembly. Afterward, reinstall the timing plug, recoil starter, and panels. Misadjusted ignition timing can cause symptoms like hard starting, poor engine performance, and stalling. Make sure to follow the factory service manual instructions closely for accurate results.
I’m dealing with a problem on my 2009 Yamaha Grizzly 450. Lately, the ATV has been stalling unexpectedly, especially when I’m trying to accelerate or climb hills. It also seems to have a rough idle and occasionally backfires. I’m wondering if these symptoms could be related to the ignition timing being off. Has anyone else experienced something similar? If so, how did you go about checking or adjusting the timing?
It sounds like your issue could indeed be related to ignition timing, especially since you’re experiencing stalling, rough idling, and backfiring. These are classic symptoms of timing being off. The engine might not be firing at the right moment, which can cause poor performance under load, like when you’re climbing hills.
I’d recommend checking the ignition timing first. Use a timing light and follow the service manual’s procedures to ensure it’s set correctly. If timing is off, adjusting it should help smooth out the engine’s performance.
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