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@@The-Accountantcoza I'm definitely in Gauteng lol. Hopefully soon

@@codeystankaitis hi, this was a small enhancement for a customer, we stuck with the stock reeds and carb. He tells me the DT wheelies in 3rd still an if he doesn't get off the throttle the bike will flip. We wanted to maintain torque at low/mid RPM and enhance a little of the top which we wholly succeeded at. Very nice results. It is combined with my rechambered head design where I calculated a new MSV and CCs and dome shape

@@panic-revv85 I hear you. I've built many of these already and trust me this works great. There's adequate velocity and atomization as well as volume

@@MonsterLegend-l9q lol

@@tke7mu0u 25 wheel horses is respectable, crank HP anyz125 is around 30-34Hp give or take. A Dyno session will absolutely be done and results posted, whatever the outcome

@Vector2strokes i do look forward to seeing the results. I want to experiment with the chinese barrels myself possibly dk a triple exhaust port setup see if it can make a bit more

@@tke7mu0u triples will get you more HP but only in the upper RPM range due to time area.

@@IndianaDoug I only ever do a light ball hone when replacing rings half way through the top end's lifecycle. Chamfering I do in 2 stages, 1st stage I use an abrasive (sand) bit to acquire the chamfer depth and angle, stage 2 I use a 2000 grit diamond bit to finish. But ball honing can work as you describe

@@lyndondeoreyes1683 unfortunately not. Different stroke and crank lobe sizes

@@MX-fo2nu this cylinder has 2 problems to overcome, 1. The+3 stroke, and 2. The 5mm longer connecting rod. Once I get the system build and degree wheel the port timings I'll know exactly where I need to place the spacer plate thickness and the trenching of the head

To keep transver at about 130 i put small Sacer below and the Bigger above the Cylinder, with Piston Dia +0.25 mm to not contact it, and Piston above the Cyl. until the upper Ring Edge is just belohnt the Cyl top end.

@@MX-fo2nu I'm still working on the build so no results yet. I'm still busy porting and not finished. I'm really hoping for that 40HP

@@zacharygillette7810 temu has a fantastic selection

Yes agreed. The More you can shine the exhaust port the better.

Hi, yes I do. If you are in South Africa no problem. Let me know

yes, I am in cape town, please forward me your details and I will get in contact with you

@@BillyWillicker I only ever raise the intake ports by as much as I need to satisfy port shape so there's never going to be that issue. I do sink the port floors though because intake timing is key in attaining an engine that breathes properly. So its a non issue, but thanks mate

@@Vector2strokes Will you be adding boyesen ports to this cylinder?

@@BillyWillicker not for this 1.

Hi, thank you! When complete it will be dyno'd to verify actual HP numbers. Then I'm hoping to enter it for some flat track racing to see how it fairs against other built blasters. I will definitely add video results when I get there

@@petercarlboer2793 do you have a rough timeline ?

@@YerzengaPerformance the PVR Performance pipe I have ordered will only be here in December so by January I should have it running

@@nopnop6259 It came complete with the blaster I purchased some years ago. The Chinese replacement cylinder option is available from PW parts on line (www.pwparts.co.za) and if you buy 1, make sure to get the option that includes the genuine Yamaha top and bottom gaskets with the OEM needle bearing, as well as the additional aftermarket piston without the ramp. Only then do you have a chance of it working. Additionally port corrections by myself will guarantee OEM like performance (or better) as the Chinese replacement has many restrictions and inconsistencies.

@@Vector2strokes dankie boet, ek sal kyk hoe loop hy as joune eendag klaar is.

@@nopnop6259 dis n pleasure boet

@@NaufalDzakir-o6u They are designed to allow more air-fuel mixture to enter the combustion chamber at a specific point in the engine's cycle, which can improve the overall flow efficiency. Boyesen ports deliver some pre-charge of mixture into the transfer updrafts which helps boost low end and mid-range torque, at no detriment to top end RPM.

@@Vector2strokes Where'd you get this modification from please ?

@@pauloconnor7951 This is a common mod for many earlier design cylinders that do not have boyesen ports

@@botshokoy888 most welcome

@@darioalcala6995 here in South Africa it's not easy, but we've recently aquired Amazon access so that's my go to supplier, as well as any Dremel outlet

@@martinzimn9213 sorry I'm South Africa I don't understand what you are saying

@@hectororestes2752 Yeah I could, but I already have another set of same with battery so this works great in the workshop

@@andythompson3528 video already explains it

@@andythompson3528 because I'm in South Africa, batteries are very expensive here and I already had the transformer so I went this route for the workshop

@@BillyWillicker thanks for the offer but I'm fine. I have everything I need

@@Vector2strokes If you would like some pointers and advice, I can help. I specialized in performance YFS200 engines for some time and still do some. What are your goals and what tools do you have to work with? I am in the USA and would be happy to share information and ship parts if ever you wanted. I have shipped int'l before and haven't had issue with it. Once again, I'm happy to help. I don't need or want to make any money on it, the satisfaction of knowing I've helped is enough. Good luck with your endeavour. PS. What port durations are you planning? Wider ports that flow more but have lower duration will work better than ports with more duration but less flow. The aiming of the transfer ports is also critical, along with making sure they are symmetrical in vertical wall angles and that their horizontal port roofs match opposite port. The left and right transfers, both primary and secondary must be mirror images of each other as best you can.

@@BillyWillickerwhat part of USA?

@@darioalcala6995 Northeast. Central/northern NY.

@@BillyWillicker I'm going to be really blunt and to the point. I do not need your help, thank you for offering. I am on my own path and need to do this on my own. I am an engineer in both electronics and mechanical (that is automotive and machinist) and although I ALWAYS welcome information, opinions and ideas. With regards to to your offer, I am already schooleld

@@geshanmoodley3316 join our WhatsApp group we can assist from there chat.whatsapp.com/BS08JiOCHJ0DRQkfyjhSxJ

@@geshanmoodley3316 I will do a carb tuning video soon

@@Vector2strokesplease

@@geshanmoodley3316 I will try do 1 tomorrow

@@Vector2strokes thanks

Yep some people have success with the China parts, but mostly they're junk

Bought one of these top ends in 2019 and it's still going. Not saying that I would recommend them over OE Yamaha cylinder by any means.

@@DanielStahler-m8f the thing about these Chinezium parts is that they're hit and miss. The inconsistency is the issue.

​@@petercarlboer2793very true.

ive seen people cut off the skirts of those blaster pistons just below wristpin bore, granted the piston slap wasn't good, but it made power and rev'd up faster.

Hi Jeandre glad to make your acquaintance. You can email me and I'll send you my number. pro.docpeter@gmail.com

Just reply here and let me know you've emailed in case it goes to the spam folder

Thank you brother. I've been doing this for years and have learnt much from the guys in the US, and have come up with some great mods of my own. Thank you for your support. Time is scarce for me but I will keep uploading more informative videos

I'm in Johannesburg brother

If you have any questions or requirements email me on pro.docpeter@gmail.com

Boysen ports can be used with stock carb and stock reeds?

@@darioalcala6995 absolutely! Boyesen ports feed the transfers with pre-charge of mixture at lower RPMs so the uptake is that low/mid engine performance is enhanced with a Little more yet noticable torque and grunt, yet they do not hinder higher RPM performance

Very happy with the cylinder. The casting is very soft, not like OEM. Also the bore needed to be clearanced or honed to the piston supplied or it would have seized. The OEM reed stops hit the intake duct so that needed to ground and clearanced.

The Dyno will be the last step to which I look very much forward

Thank you. My skills are many but drawing is not one of them. Hopefully I get the message across though

Thanks bud. I try to keep it short and sweet and informative. I don't always provide major detail as one would have to study and understand many engineering principals to understand those... Have a super day

Nooit boeta