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4 hole can to pipe questions.

Discussion forum for Yamaha classes.

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4 hole can to pipe questions.

Postby Rich Luckie » Tue Dec 16, 2008 5:14 pm

I am going from a 4 hole can to a pipe and need some help. This is what I have come up with so far. Straight header, springs (don't know how long), flex/pipe (new to me and don't know what size but was told to start out at 7 1/2" long), Pipe (L2 I have heard is what I should get) and then pipe mount. I need some help in what I need to order. I have tried calling 1 shop that I know of but haven't had anyone pick up yet. I need this ASAP! Thanks for any help.
Rich Luckie

Postby George Kraus » Sat Dec 20, 2008 12:49 am

Sounds like you are dead on the right track. Get a hold of me if you need some help putting it all togeather. I run an older A2 pipe and flex lenght is OK untill you drive it on the track to match up the clutch / pipe. Do you use a head temp gauge ?
George Kraus
Racing is life, everything else is just waiting.
George Kraus
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Location: Irving

Postby Rich Luckie » Fri Mar 27, 2009 2:28 pm

The 7 1/2 is that the actual length of the pipe or is that a measurement between something else? I just got a Cylinder Head Temperature and EGT sensor. Where is the best place to mount the EGT bung? Thanks.
Rich Luckie

Postby Bob Preston » Fri Mar 27, 2009 3:40 pm

They may have been indicating the legnth of the header and the connector (flex) tubing. I have seen a short and long header so based on what you have it would make a difference in the legnth of the connector. I would reccomend testing a few different legnths to see what works best for your setup. I am running the A2 like GK and 7-8" is about what my motor likes. Most of the EGT sensors I have seen are about the middle of the short header or about an inch from the flange and 1.5-2" on the long header. Someone else may know where the optimum is. I think the more important question is how to tune with the EGT. Again someone else may be able to comment as I have not done this yet. Let me know if you need any help as I would like to get a few more YH's up and running for the April 11th race... The Jr SS class with 8 was a fun race to watch with three battles for their relative positions going on during the final.

Bob Preston
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Joined: Wed Dec 27, 2006 7:11 am
Location: Collierville, TN

pipe length

Postby John Ray » Fri Mar 27, 2009 9:20 pm

the 7-8 inch measurement that is mentioned is from the piston to the end of the extension stuck in the header. from there you tune to your discression as your motor demands rpm wise and pull.
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