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Truth about cheap top end kits


afa913

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I have an old 400ex that needs the top end rebuilt, Does anyone have any real life experience with the cheaper ebay or amazon top end kits. I know most will probably say to stay away from them.   I dont have a lot of money into this bike and it isnt worth putting a whole lot into is why i ask.   It doesnt get raced or road hard, my son and i just drive around the fields.  thanks for any help

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I purchased a cheap piston, rings, and gasket kit from ebay last year for my Suzuki King Quad 300. I was very skeptical when purchasing but so far I am very impressed with the results- the brand I used was Namura. I have only put about 100 miles on it since the top end rebuild and have had zero problems what so ever, and I have to admit that I probably take it too far when riding my quad and beat it very hard sometimes. The reason I replaced the original piston and rings was because it was burning oil and smoking badly, the new top end parts fixed this problem and has run like a top ever since! One thing I would recommend is to check ratings on the product itself and if possible on the seller.

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Heres what I did- Don’t forget to hone the cylinder. Use lots of assembly lube. Before first start take out spark plug and turn engine over a few seconds to get oil flowing around a bit. Start it and let it idle for 30ish seconds, then rev it keep the rmps varying but not too high. This is so that the rings seat properly. And you need the variations to mimic the kind of conditions it will be facing while you ride- constantly changing rpms. Once it seems to be pretty well warmed up to regular operating temperature or you feel it has run long enough, let it cool down completely. Repeat the rev/cooling process 2 more times. Once you are ready to ride take it easy for the first 10 miles or so. Check all nuts/bolts periodically through this process. Hope this helps. The kit may come with recommended instructions also.

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  • 4 weeks later...
  • 3 weeks later...

Ive only used the cheap Chinese carbs on a honda recon and they work well for a couple days then begin to fall apart, leak gas, etc. and the quad begins to run like garbage. The body does not hold up well either, the threads on the throttle cable strip out and cause the slide to pull up so the engine runs on full rpm, has caused a number of accidents including rollovers on this particular 4 wheeler. We ended up using parts like the floats and jets to fix up the original carb body, but it’s probably more advisable to rebuild it.

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On ‎11‎/‎14‎/‎2018 at 10:56 AM, shane mcguffie said:

just stay away from wiesco, i can vouch for the namura top end kits but the wiesco pistons are horrible in my opinion, they like to heat seize and expand alot faster then stock. 

They do swell. This is why a meticulous break in is needed with a Wiseco. Personnaly I like stock (cast) pistons.

 

 

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