416 kit
#1
#4
#6
Mostly midrange with gains on top as well.
I run the 87mm 10.8:1 JE piston, an XR cam, mildly ported head, XR250 CDI, and stock exhaust.
My throttle response is vastly improved. With a little more bottom end, much more responsive mid and a mildly better top. The engine feels restricted thru the uppermid and top - a pipe would probably correct that.
I run the 87mm 10.8:1 JE piston, an XR cam, mildly ported head, XR250 CDI, and stock exhaust.
My throttle response is vastly improved. With a little more bottom end, much more responsive mid and a mildly better top. The engine feels restricted thru the uppermid and top - a pipe would probably correct that.
#7
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#8
I run a 50/50 mix of premium and anywhere from 110-114 octane race fuel.
I don't really believe that is necessary - I think 92-94 premium would be fine. I just like the added safety margin - especially when riding in the sand, or racing.
About 11:1 (depending on many other factors) seems to be the limit on pump gas on a typical 400EX.
Some engines like the YZF426 get away with 12.5:1 on premium with their high overlap cams and more precise timing maps (via TPS information). This just goes to show there are many factors that go into it.
The higher your altitude the more likely you will be able to run higher compression without trouble as well.
I don't really believe that is necessary - I think 92-94 premium would be fine. I just like the added safety margin - especially when riding in the sand, or racing.
About 11:1 (depending on many other factors) seems to be the limit on pump gas on a typical 400EX.
Some engines like the YZF426 get away with 12.5:1 on premium with their high overlap cams and more precise timing maps (via TPS information). This just goes to show there are many factors that go into it.
The higher your altitude the more likely you will be able to run higher compression without trouble as well.
#9
#10
The sleeper factor is cool, but I ride in areas where the bike needs to be quiet.
I am planning some mods on the stock silencer soon. I think there is a lot more flow to be had without increasing the noise level significantly. I'll report back my findings when finished.
Yes, the mods I have done are very easy and affordable. The 416 (87mm) piston can be installed by simply having your cylinder bored by a machine shop.
I am planning some mods on the stock silencer soon. I think there is a lot more flow to be had without increasing the noise level significantly. I'll report back my findings when finished.
Yes, the mods I have done are very easy and affordable. The 416 (87mm) piston can be installed by simply having your cylinder bored by a machine shop.