400ex
 

I have a 2006 Honda 400ex and was riding it and it quit when I slammed my brakes and clutch because there was a tree on the trail and when I tried starting it back up it was knocking but once it cooled down it turns over but won't start.
I've got spark compression timings good and electrical good I cleaned carb and even tried with starter fluid but still won't fire any suggestions

How did you verify spark/compression/timing?


If you have truly verified those it should run on SF...


Did you check your valves? Where was this "knocking" coming from?

400wx
 

I checked spark by taking out plug and see if it gave off spark and I put a new plug I checked timing by see if the cam was lined up with the T mark on side of motor. I used a compression test tool and it was all good and still wouldn't fire. I did not check valves and I couldn't really tell where knocking was coming from I think top end but not positive

Good strong blue spark or something else??


Yeah...I'd rotate the crank and ensure those valves were opening/closing properly...knocking could have been in head...

Ya the spark was good blue and I'll do that but it was getting real hot before that all the time

Well...getting hot is what air cooled motors do...did you check your oil? I'd drain & check for metal particles if you think there was a pump failure...

I drained it and it was low but seemed clean

Welcome to the forums.

Did you check the operation of the valves?

Not yet haven't got the chance to
 

Not yet haven't got the chance to