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Discussion Starter · #1 ·
According to STG:

"Fresh air injected into the exhaust system on modified sportbikes can cause back pressure in the headpipes and muffler due to unburnt fuel from modified fuel mapping combined with additional oxygen spontaneously combusting in a high heat environment. The Driven blockoff plates will stop the annoying and possibly damaging back pressure from occurring while allowing you to remove a few pounds in associated valves and hoses fromyour bike. On late model EFI bikes with 02 sensors, ESPECIALLY when using Dynojet's Power Commander V with the Autotune feature, the air injection system MUST be blocked as it will introduce additional oxygen into the system which will skew your 02 sensor's values and make it impossible to get a correct tune. Watch as Brian shows you how to a install a Driven Block Off Plate on the 2015 Yamaha YZF-R3."

I am in the market for a full exhaust, & getting the PCV from Spears to install. Has anyone encountered issues?

Here's the link to the STG how to video on Installing the driven block off plates on the R3
 

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Massive backfiring with a full system without the block off plate even with the stock tune. If you are installing the plate and a PCV do them at the same time as you have to remove the tank for both. The plate install is easy.

Might as well order the plate from Spears if you are buying the PCV from them.
 

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Discussion Starter · #4 ·
Massive backfiring with a full system without the block off plate even with the stock tune. If you are installing the plate and a PCV do them at the same time as you have to remove the tank for both. The plate install is easy.

Might as well order the plate from Spears if you are buying the PCV from them.
Right-O! I was leaning on getting a Scorpion full exhaust system which, according to Scorpion, requires no repacking or rejetting. I know the PCV might be overkill to some for a 300. My buddies here think it is but whatever. Anyway, for most flash tunes or PCV mappings there seems to be ones only for Yosh or M4 exhausts - might not make a huge difference, but I am leaning on getting the Yoshimura R77 now. Going to get the PCV & Block Off plate from Spears.
 

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Right-O! I was leaning on getting a Scorpion full exhaust system which, according to Scorpion, requires no repacking or rejetting. I know the PCV might be overkill to some for a 300. My buddies here think it is but whatever. Anyway, for most flash tunes or PCV mappings there seems to be ones only for Yosh or M4 exhausts - might not make a huge difference, but I am leaning on getting the Yoshimura R77 now. Going to get the PCV & Block Off plate from Spears.
If you are getting the Yoshi, than a PCV is not overkill, it's a requirement, afaic. Without a proper tune I was losing power. And you need to make sure you keep the baffle in the muffler. I know... you think you want it out of there, but it actually negatively affects power if you remove it. Ask me how I know!
 

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Discussion Starter · #8 ·
I would get the M4 over the Yosh. Especially since they are so closely priced. Check with Mr. Spears, if you are getting the PC V from him. The M4 is a better system. That is why he sells those and not the Yosh.
Yeah, I talked to Gregg. He supports and his Spears tuned PCV is tuned for both the Yosh & M4. Gregg actually was part of the design team for the M4 he told me.

So you should be good with either one.
 
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