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BBR 143 kit

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I have an 03 DRZ 125L, and it smokes quite a bit. I'm looking at getting the BBR 143 kit. Will this stop the smoking? BBR's description says that the 61mm wiseco piston bores into the stock cylinder, if I send my head to LA Sleeve can they bore it to 61mm and how much would that cost? How would an FMF PC 4 go with this big bore kit? Thanks!

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You can take your cylinder to a local machine shop to have it bored and have some new valve seals put in. You can also have your valves checked out by the machine shop when they put new valve seals in. A PC4 exhaust is much better than the FMF because the FMF is only a slip on.

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