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Hello all,

This is my first post here on the forms, so - hello.

My question pertains to my Yoshi R-77 Full exhaust system. I purchased the bike with this mod, however, so far as I know, the ECU has never been flashed and there is no PC or juice box attached. I have been reading up on the whole notion of running to lean and I decided that I wanted to get a consensus. Will the Yoshi R-77 full cause my 2013 300 to run dangerously lean? Is an ECU flash or PC absolutely necessary? I intend on getting my ECU flashed here soon, however, I didn't know if I was at risk by riding it as it now stands.

Thank you all for your help!

Have a look at the spark plugs, they will tell you if it's running really rich or really lean. If they look ok then I'm sure you'll be fine without a flash or pc5 (as long as the bike also feels like it is running fine)
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