Jan 11, 2007 · If you plan on keeping the bike for a while, go with a 10.5:1 416cc (87mm bore) piston. It will bore into the stock sleeve. 416cc: 87mm. 426cc: 88mm. 440cc: 89mm

Jan 29, 2004 · I am seriously considering the purchase of a big bore kit for my XR400. Between Wiseco, IMS, and L.A. Sleeve who makes the best kit? I have been told by one person that they are all LA sleeve with another persons name on it. Is that true? Which leads me to the next question. I found a Wiseco 440 ...

A Honda XR400 could easily go faster than 65 MPH… or not even be able to hit 55 MPH. It all depends on gearing. If you’ve geared your dirt bike for trail riding , then it won’t go as fast as if you’ve geared it for road or desert racing.

Nov 22, 2005 · Has anyone weighed the 440 piston for the XR400 ? How does it compare to standard ? Which 440 kit would be the best ? Thumper Racing state they have a super light piston. Is their kit exclusive to them ? Looking at upgrading …

Jan 19, 2023 · XR400 Weight - how heavy is it? Back to the weight, the XR 400 weighs about 276 pounds fully loaded in stock form. Believe it or not, it was built to be a lightweight mid-size XR because the XR600R was so big and heavy to handle off-road.

Dec 6, 2007 · I'm rebuilding the top end on my stock bore '96 XR400 right now and per the recommendation of the machine shop where I spec'd the clearances at, they recommended a Wiseco 402cc 11:1 piston. It runs fine on 93 octane (no race gas) and allows a …

Bolt on 89mm 440cc big bore kit for all Honda TRX400EX and XR400 models. This is a complete kit, with everything you need. Improved cylinder design with a larger cylinder sleeve for longer lasting performance. 10:1 89mm Piston with hard anodized dome.

Bolt on 89mm 440cc Big Bore Kit for all Honda TRX400EX and XR400 models. This is a complete kit, with everything you need. Improved cylinder design with a larger cylinder sleeve for longer lasting performance. 10:1 89mm Piston with hard anodized dome.

Works on all Honda 400EX, 400X, and XR400R models and years 88mm heavy-duty big bore cylinder 88mm big bore Wiseco or Wossner forged piston Nitrite... View full details