2018 YZ250F

Ronald
Profile picture for user Ronald
Posts
4
Joined
8/26/2020
Location
Downers Grove, IL, USA
Ronald
Just recently overhaul engine put big bore cylinder piston ported had new spark plug ignition coil
Very hard to start what’s the problem thanks!
Sometimes start from 50 kicks and does a lot of back fire to exhaust or air filter or back kick to kick start
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Ronald
Profile picture for user Ronald
Posts
4
Joined
8/26/2020
Location
Downers Grove, IL, USA
Ronald 8/26/2020 2:54pm
8/26/2020 2:54pm
Timing I did set and checked but valves brand new ported head should be set too and that’s what said in instructions that they set
Factor E
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971
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9/22/2011
Location
So Cal, CA, USA
Factor E 8/26/2020 3:33pm
8/26/2020 3:33pm
Backfire equals timing or electrical
Ronald
Profile picture for user Ronald
Posts
4
Joined
8/26/2020
Location
Downers Grove, IL, USA
Ronald 8/26/2020 4:12pm
8/26/2020 4:12pm
I did change coil to new and checked capacitor
But another think when it starts works perfect without any problems

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