⚡ Ignite your Big Bear’s true potential—start strong, ride stronger!
This Ignition Box (1YW-85540-20-00) is engineered specifically for 1987-1988 Yamaha Big Bear YFM350FW 4x4 and Moto 4 YFM350ER models. It enhances throttle response with an aggressive timing curve, boosts ignition energy for easy starts, and raises the speed limiter. Built from corrosion-resistant, high-performance chip materials, it ensures stable, interference-free operation. The plug-and-play design with included dielectric grease guarantees quick installation. Backed by a 2-year warranty and responsive customer support, it’s the ultimate upgrade for reliable, smooth ATV performance.
E**G
Little off but works
The wires were different colors but I just plugged it in anyway. It gave it spark. I have to jump start the bike but it works. Not sure if it's the stator or wiring but least it has spark now.
R**C
Solved My Problem
Distance between mounting bolt holes are wider on this replacement than the original Yamaha part. However you can get it mounted securely enough through one hole. It functions as well or better than the original. and is well worth the money.
T**D
Great if you don’t want a working atv
I’ve probably spent close to 6 hours trying to figure this out and it won’t work, and you’re probably thinking “this dude’s an idiot, it’s literally plug and play how could you mess that up” but to add some context if you notice in the pictures there’s a yellow and green wire, and you may be thinking “hey that’s a cool wire”. Well too bad for you because you’re getting a blue and white wire instead as well as the amazing addition of no instructions on what anything does and ya you can look up a wiring diagram for the atv but have fun matching up a wire that doesn’t exist. And to the seller or anyone, if you’re seeing this and can send me a diagram of what this specific cdi does and what all the wires do then I’d gladly take down this review.
L**R
Junk
Looks nice, says it will work, but it DOES NOT WORK! Waste of time and money. Buy better quality elsewhere
R**N
Cdi box
I was a little sceptical about buying this but I did and it fixed the problem and it's still working so no complaints
M**.
Worked…ish
It produces spark, but the timing is incorrect with this unit for a 1987 Yamaha Moto4 350
4**N
can be used in 87 warrior
as the original part was discontinued, research will show that the yfm350er (87-88 moto 4) has the same rotor, so when looking for a stator/voltage regulator or cdi, use yfm350er cause using 87 warrior will lead to it's a one off year or you can get the old one rebuilt for $250. I took a gamble and it panned out as well as saved me over $200 and waiting time. May need to modify key switch harness if no spark when installed, as it may create redundant ground to coil, cutting black wire in key switch harness will fix it.
C**H
Cheap Chinese doesn’t work
Didn’t work
Trustpilot
1 day ago
2 weeks ago