300/440/550 looking for advice with my 300 project

[yamarider]

Here are some pictures of the 300 i have just finished putting together.

Im running a bn38 at the moment which went really good with the stock pipe but now after i put the kerker pipe on it seems to be running too lean. I have just drilled the main jet out by .1mm but havn't tested it yet. Has anyone done this mod before or had experiance with tuning bns?

 

[Austin]

In the past I have always put a mikuni carb on my skis as my first mod. Then I do the pipe but your carb should have no problem with that pipe. My old 550 actually had a pipe on it when I got it then it had a bn38 on it and it ran good then right after the first time I took it out I did a head and carb then rideplate. Did you try tuning a little bit first/

 

[SLIM JAKE]

i have been looking for someone that has done this. how did you mount your kerker pipe to your motor..i just picked one up from a friend and it wont fit can you tell me how you dont yours on? thanks

 

[yamarider]

firstly you need to make sure that you have the right pipe for your 300. Kerker made a similar pipe for the 300sx as well which wont fit the js. Mine came with all the hardware to bolt straight up and i found the hose diagram on the internet.

 

[SLIM JAKE]

ohhhh thats why. you bought that for your js and the one i got from a buddy is off an sx. damn.