2019 KX450 Piston Replacement with Precision Concepts Racing

[@davidgoodrich868]

You failed to mention the ring gap and ring gap orientation.

[@dogger2186]

Dry install the Piston and Rings. Only lube the wrist pin and clips. Lubing the cylinder creates carbon right away and poss that the rings dont seat good. 1- Clean the piston with contact cleaner 2- Wash the cylinder with Hot Soapy Dawn water and rinse will then clean with contact cleaner 3- Install the Piston to the Rod with Assembly Lube 4- Clean the cylinder out with contact cleaner 5- Install the Cylinder Dry taking your time to make sure the rings seat correctly 6- Re-assemble everything 7- Fire it up and let it run until it pukes coolant 8- Shut it down and let it fully cool 9- Repeat step # 7 & # 8 10- Go to the track and rip it I can promise that at your next piston change that your piston will be a lot cleaner and carbon free then installing with lube in the cylinder. Rings seat 110% better without lube!

[@braaapdaps6814]

“Fire it up and let it run until it pukes coolant”…. First I’ve ever heard that. Let alone someone telling a race mechanic how to do their job shittier.

[@dogger2186]

@@braaapdaps6814 been doing top end this way for years and no failures. Do some research a lot of top road racing teams do this. Try it you will be surprised at how clean the piston is at the next piston change (40 hrs)

[@josephmcgriff7452]

Best information video I have ever seen! Keep up the great work on perfecting your craft; if you haven’t done so already.

[@bonecrushinbullies]

Thanks for the tips homie !!!! Keep on wrenching compa

[@sebastiansampaoli472]

Hola! Tengo un kxf450 2011 con medida de cilindro 96,050 que piston debo colocar?? Gracias

[@mmateosmorphs]

What size hone?

[@j_wal_0273]

What do you call that stone that you used to flattens the top of the cylinder?

[@mxjoe1777]

How long you can drive on new piston ? When is time for new piston on how much hours can make ? Thnx

[@DMIsREAL]

Everyone has a different opinion but 100 hours is about time

[@Zackrey507mx]

Questing, I noticed my bike has had a bad valve tick, my valves are always in spec, but I noticed that my rocker arm shafts had slid out and are rubbing against the valve cover. There is no retainer clip for my rocker arms, is this something anyone else has experienced, and how do I fix it?

[@johns5181]

What Cylinder Hone should be used?

[@crispincurtis8585]

No Plated cylinder?

[@joeishere500]

BREATHABLE Sponsored shirt ??

[@moa_moto135]

How much would this cost me For u guys at chaparral to do it

[@petermoygannon698]

chatter from top end at 35hrs. before strip down what would you expect.

[@ziggybammurphy191]

This is like rocket science compared to top end job on a 2 stroke..... id still love to do one, but man, what a ton of work......but with a 4 stroke, id imagine u don’t really need to do these jobs very much..

[@MotoBuilds]

It's easy work. Nothing to it.

[@yourname-wz4bl]

@@MotoBuilds still youre looking at a video telling you how to do it. if its easy work and nothing to it, what the fck are y watching this video for?

[@MotoBuilds]

@@yourname-wz4bl I build motors and have a business manufacture MX parts for a living. I just can't stop watching it's like an illness

[@darrenjones6965]

Good video. Very helpful 👍

[@frankokrisztian1400]

Hey! Great video, thanks! Have you got any experience with the timing shaft and gears spining?

[@blarpieman]

I am pretty sure you never hone nikasil coated cylinders. Just scotch bright. Correct me if I am wrong.

[@motocross211]

Have always light honed my nikasil cylinders before I've done all my 2 strokes.

[@Игореха269]

32 hours and new piston??

[@Alex-h9b3r]

60 часов по мануалу у простых людей! У спортсменов профи 32!

[@cory2146]

super cool thanks!

[@mteichert32]

Would it change the characteristics of the bike beside sound if you took the end cap off shortened the muffler and put it back on?

[@scottmorgan6099]

Great video, .... 🇺🇸👍

[@danjim7056]

Great video but dang the music is a bit loud.

[@marcusbarnes5929]

2021 kx450 or 2021 ktm 450sxf which engine is more reliable

[@johnpaul2336]

Ktm, known for their engine longevity coming from a kawi owner

[@Blocanbentlyyahu]

Kawi got more power but ktm probably got a longer life span until rebuild

[@NickW90]

@@Blocanbentlyyahu kx450 has the least hp of all the 450’s besides the rmz

[@Cetrifuga1945]

Ci vorrebbe un motore un cilindro e un pistone di centraggio e che la catena con un coperchio della distribuzione si possa cambiare dall esterno e le valvole auto registrabili il silenziatore a due nello stesso lato con piccoli silenziatori le forcelle con la bombola dell aria o gas sotto doppio freno o singolo con pinza generosa e molla del prolongò più grossa telaio in titanico .

[@juannnn8074]

Por favor puede traducir al video a español? Gracias

[@bingbing-ti2rv]

Na

[@motik954]

👍👍

[@buddylittle7759]

more talk,less music

[@luistrejos5997]

Hey are u mexican?

[@wahyuadipamungkas3911]

Yang ngga ngerti bahasanya like😂

[@wedgecharger]

A Ball hone ......talk about low budget

[@shooter7a]

Nikasil lined cylinder..... The ball hone is just to deglaze it. It is not for sizing. These guys know more about building bikes than you have forgotten. When the cylinder gets out of size spec, it goes to Millenium etc for a replate. It is simply not worth it for a local shop to have the sort of tooling to hone Nikasil to size.

[@wedgecharger]

@@shooter7a Then why did they say and show the opposite in the vid ?

[@shooter7a]

@@wedgecharger what are you talking about? He said a "nice light hone to clean up marks" and "provide lubrication". NO competent mechanic ever uses a ball hone for sizing. They are just for light surface finishing. Why don't your read BRM's own statements regarding ball hones: " Flex-Hone® tools are not designed for heavy-duty material removal, but they do work like an abrasive scrub brush that removes combustion by products and the "glaze" that forms on used cylinder walls." THEY ARE NOT FOR SIZING. That does not mean they are cheap. They are a tool for a specific job.

[@SOLDOZER]

Thank God I dont own one of these 4 stroke pieces of crap!

[@TypicalJacques]

Damage, Inc. lmao stfu 2 stroke fanboy

[@yourefireed]

2 stroke fanboys can’t afford 4 stroke thats why they hatin 😂

[@littleice9731]

You dam right

[@rudolphhessian4183]

@@TypicalJacques Something is wrong with design if you need to rebuild it constantly. Its like some sort of space machine engine, yeah it makes alot of power, but you need the backing of NASA to fund it. Oh scary, I would be up worrying about my cams, valve adjustments, AHHHHHHH! Back to two stroke, may be for

[@shooter7a]

You are a dolt. The 19/20 KX 450 is one of the finest MX bikes ever made. It feels lighter when riding than my 250 two stroke. It is an amazing bike.