Big Bore FAQ

I get quite a few emails from people who’ve done a big bore kit and then run into problems. Most of the issues are repeated so I’m going to try and list the problems along with the solutions here. I’ll just copy and paste from the emails to save time. It’ll probably be a bit chaotic till i’ve figured out the layout/format…but here goes:

Big bore starting problems

– Big bore doesn’t run right, no power

– Big bore keeps overheating

– Big bore not making power

– Big bore no top end power

– Can I modify the stock ECU to give the correct fuelling for the big-bore kit? (no, but…)

If you’ve got a big-bore issue you need help with email info@northcust.co.uk or use the contact form

YZF-R125 tuning, Stretching scooters, welding & fabrication, customising, custom parts.

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