Repairing a blown up dirt bike cylinder! Sleeving a Nikasil plated Yamaha YZ 250 topend
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- เผยแพร่เมื่อ 29 ก.ย. 2024
- Sleeving a Yamaha YZ 250 topend
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You are the man! Thanks for your time. I sent mine out for the same thing.
Awsome work my friend. Thanks for taking the time in sharing you skill and talent.
Thanks for watching!
Great video!!! Lots of useful information.
Thanks for watching
Can you please help me with a blaster piston?
I want to use a blaster piston in a banshee
So they both have aluminum cylinders with cast iron liners but the blaster is air cooled and the banshee is water cooled
So i want to cast a nikasil bore cylinder
So the blaster piston recommends
0.05100mm clearance
So what should be the clearance for a nikasil bore? Please🥲👑
Do you do mail ins?
@@Ashroyer86 yes email us ericksonmap@gmail.com
The bigger piston asked for for clearance because its bigger i suppose, Great content, This is going to be my next project for my shop 🙏😎
10mm isn't that much larger when it comes to piston to wall clearance.
10mm difference = .03mm larger clearance or .0011" Unfortunately, I didn't have another piston The exact same size in the shop that has a cast iron bore to show it. I just kind of wanted to show the example of what to look for when you're doing it. Many things go into when you're setting up the clearance on an engine , especially a two-stroke engine. Those are is it air cooled or liquid cooled or like a boat or jetski cooled with cold water, plated or iron liner , forged or cast piston , compression and use. All of these factors go together to setup clearance. Most people think that the tighter the bore, the better it is that is really not true. You will many times get yourself in much more trouble trying to go too tight than have it a little loose. But all that knowledge comes from years of trial and errors. Great comment! Thanks for watching
Nice work Mark, On a PV cylinder like that do you test the fit of power valve to cylinder/ piaston clearance to ensure that there will not be any problems with contact between the piston and PV? thanks.
Yes that is always checked
Normally at stock bore nothing has to be done. But it's always checked
Nicaseal cyl plating far superior to a cast iron sleeve if the engine is broken in an warmed up correctly you get a tighter piston to cylinder fit which gives more power longer life before cylinder work is needed seen it last as long as 5yr of racing before needing replated can't do that with cast iron sleeve without boring a couple of times
That is not necessarily true. And it also depends on the engine. Plated cylinders are great, but they have there draw backs as well. Plated cylinders are setup tighter but expand much more when heated up. HEAT BOTH Up and measure when at 130f. You will be surprised. Their operating tolerance is very similar when heated , a plated bore expands ALOT MORE then a iron liner. Also it depends if your comparing a iron sleeve , a ductile iron sleeve or a hardened sleeve. They all perform differently have have there benefits. When porting cylinders, you can port an iron sleeve a lot more aggressively. Plated cylinders are known for pealing the plating at the ports when heavily ported. As to your comment on making more power, that's a wise tail. We have dynod engines back to back years ago testing plated verses iron sleeve, and there was no virtually difference in power. To be honest, the sleeved bore made a little more power, but they were so close that it wouldn't be noticeable. The reason Oem manufacturers use plated cylinders is that it is ALOT cheaper to manufacture. it's a cost thing. It has nothing to do with performance.
Thank you for commenting. This is a great idea for a youtube video! I'll build 2 identical engines Nikasil and sleeved and put them on my dyno to show the difference. Thanks for watching. Have a great day
How much will this cost?
Email us ericksonmap@gmail.com it depends on engine and what piston you want but I'll be happy to quote you
Looks excellent. Quality machine work. Cross hatch is excellent. Re sleeving a coated bore is the way to go. It affords boring. Great job.
@jeffdavison8421 thanks for watching and commenting 🤘