2000 Yamaha Big Bear 400 No Spark

[unirambler]

Nice! Gives me hope I'll get ours running. I found last night that it turns over but there is spark, so I'll begin troubleshooting that this weekend. I'll start a thread in the Suzuki ATV forum soon.

[Gwbarm]

Sounds like you are in good shape, spark and compression, you might get away with just cleaning the carb. Keep me updated I like hearing the progress on resurrection projects. 

[kp3004x4]

That's great that you have some progress and get those kids involved we all need to to keep knowledge of mechanical things alive or this new generation will be nothing more than videogames .

[Gwbarm]

I took my old carb back off, kind of a mess, I just cleaned this last week in ultrasonic cleaner, cleaned the tank out, cleaned the petcock, and put on new hoses. Im not sure where this white powdery stuff came from. The only thing I can think of is I sprayed some silicon based lubricant in the bowl and around the movable parts, maybe the gas caused the lubricant to break down. It was Tri- Flo won't use that again. Waiting on new carb to arrive.

[kp3004x4]

The white stuff is normal,it's just the carb showing age. The cast aluminum is breaking down a bit,most I've seen from look like this after setting up for awhile with fuel inside. 

[Gwbarm]

I think this thread is done, got my no spark issue solved with the help of Eugen, Mech, 5200 and everyone else that has responded. When I get my new carb in I will start a new thread to continue with the revival of this neglected beast. Im having fun, so I must be doing it right, no pressure just going at my own pace. Thanks again for all the support.

[Gwbarm]

Thanks for the replyKP I have seen it before also but didn’t think anything about it because the carbs were in really bad shape, but this one seemed cleaner before, I wonder if it has something to do with the heat or soap I use in the ultrasonic cleaner, I don’t use really harsh chemicals unless the carb is really bad with dried varnish on the inside and I only used dish soap on this one

[Mech]

Yeah I reckon it must have been too clean and needed a spray of wd40 or something after the soap

[Gwbarm]

Yeah that's what I was thinking WD 40 or 2 stroke oil.

[Jim Denton]

Yay you! Maybe I'll get inspired and get back on the King Quad. I love Triflow, a gunsmith turned on on to it years ago. It's actually Teflon based, and it smells great.

[EugenM]

On 4/20/2023 at 9:06 PM, Gwbarm said:

I think this thread is done, got my no spark issue solved with the help of Eugen, Mech, 5200 and everyone else that has responded. When I get my new carb in I will start a new thread to continue with the revival of this neglected beast. Im having fun, so I must be doing it right, no pressure just going at my own pace. Thanks again for all the support.

I'm glad I could help!😉😉

Sorry for blurry video... camera was dirty!