Jetting Question.. Swaping out my T-5s to shearers

[DuneBooZeR]

I just sold my T-5's and bought some shearers. They will be here at the end of the week. My bike is running strong now and I was wondering if I have to re-jet with the new shearers? Any info would help. Thanks

[Josh Z]

Of course! probably 1-3 jet sizes. get some jets and always do several plug checks thru a day of riding.

[DuneBooZeR]

Thanks... will do.. I should get the pipes in on Fri. and going riding on SAt. Im hopin for a good weekend.

[camatv]

if you have stock carbs you will mostlikely need to go up 2 jet sizes or more. the added RPM of the shear will need more fuel to maintain. if you have a 310 try a 330

[bansheeinoz]

Cannot help you with the jetting, but your bike looks fantastic, I love the black plastic and the flames look awesome,

[DuneBooZeR]

Thanks, a buddy of mine did them for me and they cam out great. All I need now is for that brown truck to stop by.

[BUILDER]

Well just my experiance becasue I just went from T5 pipe to Shearers on my 421. I went up 2 jet sizes and it was way to much fuel you may go up one size but that will be all. I am going to go back to the same jet I had with my T5'S and just try adjusting the needle.

[252wheelieking]

Well just my experiance becasue I just went from T5 pipe to Shearers on my 421. I went up 2 jet sizes and it was way to much fuel you may go up one size but that will be all. I am going to go back to the same jet I had with my T5'S and just try adjusting the needle.

 

I went from T-5's to Shearers & only went up 1 jet size also. I was running a 158 with my T-5's & went to a 160 with the shearers. It seem to be a tad bit rich so im going back to the 158's. my motor isn't together now but I will give update on how it turns out when I rejet.

[rubberneck]

I went com t5s to shears on an hjr aggressive dune port and found the mains to be the same as well. Check your plugs no matter what you do that is the most important thing to remember

[252wheelieking]

Just thought of something else....What pipes where your cylinders ported for? Cause when I got my cylinders dune/play ported by Kevin they were for T5's. I dailed my jetting in perfect with 158's & kevin personally told me a good jetting starting point would be 160's with the Shearers. I did what he recommended & I was rich on the mains. I now have to get a fresh topend rebuild because of low compression & asked kevin what where my durations for the exhaust port for the T5's & he told me. Then he also said he have to work the exhaust ports some more to match the shearers to see even more mid to top performance. Which is a higher exhaust port duration, so now im thinking more air flow thru the cylinders. That is the reasons you would have to go up on the mains with Shearers because the exhaust ports allow more air to flow freely than the T5's exhaust port durations. So by changing to a pipe that will choke it out more the mains would change & changing to a pipe that flows more freely than what it was ported for the jets stay the same.

 

I hope I made a little bit of sense by posting this....If not im pretty sure somebody will correct me.

Hope it helps you dude.

Edited July 27, 2011 by 252wheelieking

[252wheelieking]

Any updates on your jetting & performance switching from the T5's to the Shearers?

[ban99shee]

would also like to know your opinion on these compared to the T5s. I'm running a set-up similiar to yours with T5s and would like more rpms. I was thinking of getting a set of the shearer pipes.