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#Honda atc 350x big bore kit manual
#Honda atc 350x big bore kit mods
#Honda atc 350x big bore kit plus
#Honda atc 350x big bore kit series

#Honda atc 350x big bore kit series

We also have KTM Big Bore Kits, including the KTM 280, the KTM 250SXF (for the 280cc and the 265cc), and the Crower Power Cam -Victory Series camshafts. About the same price ranges for the motorcycle big bore kits and the ATV big bore kits can be found for the Suzuki and the Yamaha models. We do have a wide range of big bore kits, including for 2-stroke off road motorcycles, 4-stroke off road motorcycles, 2-stroke ATVs, and 4-stroke ATVs. Carefully pack it, and then send the package to us. Detach the cylinder from the motorcycle, and then remove every component from the cylinder that’s not really necessary for modification. After the beak-in, you’re good to go.Īll you need to do is to determine the big bore kit you need.

Most of the time, it’s all a matter of bolting the kit on and then tuning the carburetor.

If your cylinder is fried, then you really don’t have much of a choice except a big bore kit.

In some cases, the cylinder head will have to be re-chambered to the right volume and compression ratio. Modifications will be made to the power valves, should they be necessary for the valves to work properly with the bigger bore size.

Kustom Kraft will do the rest, including boring, sleeving, or replating the cylinder to the new size.

#Honda atc 350x big bore kit plus

All you need to do is to send Kustom Kraft the cylinder and head plus the power valves.

Kustom Kraft has big bore kits for all the popular brands.

You’ll get the additional power you need, whether for just trail riding or for serious racing.

This improvement is available for 2-stroke and 4-stroke motorcycles, and for ATVs.

It’s also among the most affordable ways to boost engine performance, as many other modifications are much more expensive.

This is the most effective way to boost the engine performance.

Big bore kits are a totaly different animal than just a simple over bore for an over size piston.

As we’ve said, you get a boost for both horsepower and torque, and throughout the entire power band. 1986 Honda 350x 1984 Honda 125m x4 1983 Honda atc 70 w/ Lifan 125 1984 Honda atc 70 Yamaha tri zinger Yamaha 4 zinger.

But anyway.You will find that the benefits you get from our big bore kits are utterly tremendous: How much actual displacement is picked up by a given over bore varies based on bore and stroke dimensions of the given engine. 040" over gets you 40cc of additional displacement. Lots of misconceptions out there about displacement gains from a simple over bore. Just wanted to make sure you understand the difference between boring a cylinder for an oversized piston and an actual big bore kit.

#Honda atc 350x big bore kit mods

Then if you really want to go nuts there are stroker cranks available to increase displacement even more, plus cam, head porting mods and on and on. So in the case of the Powroll 393cc big bore cylinder kit you buy the cylinder kit, then pay the shop to remove your stock sleeve, bore the cylinder for the oversize sleeve (if necessary) then intall the new sleeve and bore it to match the new piston.

All of this will add up a bit in labor expenses. In some cases depending on the engine and bore kit the cylinder itself has to be bored to accept the oversize sleeve. The difference is the actual big bore kit that nets you significant displacement gains involves replacing the sleeve with an oversize sleeve and piston. Powroll still offers big bore cylinder sleeve and piston kits along with stroker cranks for the ol' X. So keep that in mind.īig bore kits are a totaly different animal than just a simple over bore for an over size piston. Going with the 12:1 would be even a bit more improvement, BUT that piston will have you in race fuel territory. I think it's a pretty good "bang for your buck" option to coax more power out of an X. My brother has an '86 350x with that piston and when running side by side with his buddy on another 350x with the same exhaust and filter but with a stock piston you can see the machine with the 10.25:1 piston is quicker revving and pulls a bit harder through the gears. So, the 10.25:1 piston would be a noticeable improvement over stock.

#Honda atc 350x big bore kit manual

It's been a while since I have looked at the Honda sevice manual for the 350x but I seem to recall that stock compression was something like 8.5:1. Now, as you can see they offer 2 different compression ratio pistons, 10.25:1 and 12:1. The purpose of oversize pistons such as these is solely to address a cylinder that is worn out of spec. Don't expect big or even noticeable power gains boring.