YX 150 head on a Zongshen z155 ~ Running awesomely HD

04.04.2015
Well everything is done now and running well. Happy with how its come up after dropping the jet back to a 102. Running nicely now not to rich and not to lean....just right! This should work with any 150/160YX heads....they have slightly harder valve springs and I did a little bit of porting and polished up the exhaust port.

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