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Edit page New page Print page More Page last modified 19:30, 11 Jan 2009 by internetscooter 5 Page Notifications Off User:Internetscooter > Scooters > Dry Lake Racer > KDX Top End KDX Top End From $1 Table of contents 1. Wiseco Information 1.1. KDX 200 1.2. Top End Bearing The Kawasaki KDX 200 or 220 looks like a realy good fit for a Vespa topend conversion due to stroke and bore being almost the same. However, there is quite a bit of modification to do to the cases due to the height that the cylinder sits on the PX cases. The 220 is a lot harder to come by so we chose the 200. If we have to go bigger we may be able to get a 220 sleeve and do some porting. Another alternative is oversizing. Scooterhelp talk about it for Lambretta's (Kawasaki KDX200 Cylinder) The KDX also has a bigbore kit see: 240 Big-Bore Kit for the KDX200 JustKDX info  KDX dyno (note this may be an old KDX) KDX forum Wiseco Information Wiseco Pistons etc KDX 200 With the KDX crank the 200 is 198.51cc, with the Vespa 60mm long stroke we end up with 205.35cc. KawasakiCycleDirt.pdf  Model  Years  Bore x Stroke (mm)  Bore Size (mm)  Forged Wiseco Piston  Repl. Ring Set  Repl. Pin & Clips  Top End Gasket Kit  Top End Bearing    Main Seal Kit    Main Bearing Kit  Forged Wiseco Connecting Rod Kit KDX200 Pro-Lite Electrofusion Bore - Cylinder sleeving or replating required for oversizes. 1986-06 66 x 58 66.00 66.50 67.00 67.50 68.00 711M06600 711M06650 711M06700 711M06750 711M06800 2598CD 2618CD 2638CD 2658CD 2677CD S255 CW16 W5456 1995-05 $38.91 (D4332) B1008 $14.95 (D798) 1992-06 $19.95 (D7911) BK5006 $24.58 (D5741) WPR131 1989-04 $97.25 (D1236)   The biggest we can go in the 200 is 68mm bore = 217.99cc (with 60mm Vespa long stroke) For the 220, bore 69-70mm = 224.45cc-231cc (with 60mm Vespa long stroke)   Top End Bearing Comp-PinsClipsBearings.pdf  Part #    Inside Diameter (mm)   Outside Diameter (mm) Length (mm)   B1008 16 21 19.5 Both the wrist pin of a Vespa PX and KDX are 16mm, so a KDX piston can be used on a Vespa conrod (with a Vespa topend bearing).   Tags: (Edit tags) No tags Attach file or image Files (5) File Size Date Attached by     Comp-PinsClipsBearings.pdf Wiseco - 2007 Pins/Clips/Bearings Catalog 197.14 kB 09:10, 18 Sep 2007 internetscooter Actions Attach new version Edit description Move/rename Delete   Comp-SleevesDirt.pdf Sleves 578.85 kB 22:15, 4 Dec 2007 internetscooter Actions Attach new version Edit description Move/rename Delete   kawa.kdx200.89_4.lg.jpg No description 73.8 kB 16:28, 30 Nov 2007 internetscooter Actions Attach new version Edit description Move/rename Delete   KawasakiCycleDirt.pdf Wiseco - 2007 Kawasaki Dirt Bike Catalog 1335.49 kB 08:35, 18 Sep 2007 internetscooter Actions Attach new version Edit description Move/rename Delete   kdx95d6_12.jpg No description 43.4 kB 16:28, 30 Nov 2007 internetscooter Actions Attach new version Edit description Move/rename Delete Images 2 kawa.kdx200.89_4.lg.jpg kdx95d6_12.jpg   Comments (6) Viewing 6 of 6 comments: view all #1 Biff? says: Regarding the comment above on the smallend bearing, would the outside diameter match the conrod, and inside the wristpin so theoretically a px one would do if a standard crank was used.- Ive got a yz125 topend Im trying to graft on to smallframe casings,the smallend is the current hurdle I'm facing as the vespa wristpin is 15mm on the smallframe.( feel free to edit or delete) Posted 23:35, 7 Jun 2008 #2 internetscooter says: Thanks. I've fixed up the error. I'm running a KDX piston on a standard(ish) Vespa crank, with a standard Vespa smallend bearing. It should not be too hard to locate a smallend bearing of a sensible size. It was pure luck that the Vespa one fitted, however they come in all sizes and thicknesses. Check out the Comp-PinsClipsBearings.pdf as a starter. A bearing shop after that. Posted 07:14, 9 Jun 2008 #3 vesparados150 says: hello mR. internet scooter...i was wondering....of u wanna do a top end conversoin, what are the points to take note...is it the displacement???and how does the powervalves work on vespa?? Posted 13:58, 30 Oct 2008 #4 internetscooter says: finding something that suits the current crank is the main issue (just to start with). We were testing the power valve last night, we just had it set in either position and have decided to leave it in the high rpm power. At this point we think that is fine, the gearbox is sensitive, so it doesn't make sense to strain it taking off. On a drag bike, though you'd want to get power in both ranges. Posted 21:41, 30 Oct 2008 #5 vesparados150 says: If u dont mind asking, what is the status of the motor..?!how reliable is the motor??U guys really inspire me to do a conversion my self but not LC cylinders.im still looking for the right barrel to do the conversion...All the best to u guys! Posted 13:56, 16 Mar 2009 #6 internetscooter says: Motor is up and running and racing. We don't have the correct pipe for the KDX so we aren't getting the fulll power and where we want it. I'll be writing up an article for Scootering Mag with the results of the Salt Lake racing :) It is VERY reliable - we have purposely built up the power slowly to make sure we don't break anything (and if we do we fix the problem before more power is added). For example if we slip a gear, we break the gearbox, so the first time it happened we strengthed the springs on the gear selector to stop it happening again (which worked). Posted 21:39, 29 Mar 2009 Viewing 6 of 6 comments: view all You must login to post a comment.

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