Question for Turk

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Hello Turk. Do you know why the stock jetting is so much fatter on the viper motor as compared to the SRX? I am going to lean out my new viper after break in and I have no idea on where to begin. My impression from comments here is that I may drop to 151.3 and check the piston wash. I ride in the midwest, Minnesota and Wisconsin. Everything is remaining stock on this sled and I would like it to be reliable enough to run 87 octane when I am in the backwoods in a pinch. Do you think this will be too lean to start? Also I should mention it is a Viper S with DCS. Any info is appreciated!

 

[nodoo_s]

I live in maine and have removed one layer of gasket. I am running 152.5's on high test with no problems. Looks like i have a little more room in most conditions.

 

[Turk]

The sled is jetted like that cus of a combination of timing, compression, piston design...it is just tuned differently then the SRX. Instead of jetting down you might want to go variflow or install some SLP airhorns so you can change air-fuel mix on the fly when the DCS goes off!

 

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Thanks Turk!!

 

[HyperMax]

The reason for the larger jets is the float bowls are vented to the air box. This causes the float bowls to "feel" possibly lower/negative pressure than a float bowl that is vented under the hood like a SRX. This can change fuel flow through the same size jets.