BSR Yamaha R1 Cylinder Head Porting
HTML-код
- Опубликовано: 4 окт 2024
- 04-06 Yamaha Video done for Brian's R1. I can make a video for you too!
Complete Rebuild, porting and upping Compression Ratio. It's not all about going faster, (which it will) but it will just plain run better and smoother, making it more fun.
I do any brand of sport bikes, dirt bikes, any # of cylinders.
This same technique can be used on any internal combustion engine.
If you have any questions about making more power, John Boston wfofz1@hotmail.com
These Yamaha heads remind me of that old Honda motor that had so many valves they made the pistons oval shaped to fit 8 in each hole. Also it would be interesting to see a dyno test comparing polished ports to rough ports just to see the pretty shiny ones make less power
Ya, these do have about as many valves as they could cram in there. It adds a lot of time and hassle to the port work.
That Honda (NR 500) kind of failed, at least partially because of the need for two rods per piston, it was impossible to get both rods to have the exact same bearing clearances/tolerances to keep the piston square in the bore. Causing rapid wear and loss of ring sealing/compression.
You are right, it would be interesting to see a direct comparison on smooth vs rough inlet ports. I've not tried it myself. I've done both but not on the same motor/application. I just go along with the (now) generally accepted practice of leaving them slightly rough. I believe cars guys have done this experiment but I can't say exactly who or on which application.
***** some guys are having the intake prts dimpled on cnc machines now. Like a golfball surface
Ya, I've thought of trying that but it'd be too hard to get right by hand, I think.
I get really good gains with the methods I use. Generally 10-15 HP peak gains (on 1000cc motor) with good gains all throughout the rev range. It's not an all or nothing modification.
I did a Suzuki DR650 and made a 49% increase in power (with cams) turned out to be the most powerful DR in the world. Too bad I didn't think to make a video out of it.
***** Awe man I love that big bush pig DR. Did you use the 790 top end? The DR head looks abnormal compared to other 650s with those tiny valves. Thats impressive. Probably over 50 ft lbs at the wheel?
I used a 700 top end (biggest available at the time, 2009). I forget the torque# (I've switched computers since then) but it went from 32 Hp to 52. I increased the compression also with a thinner gasket and milled head. Pumper carb, FMF pipe, pretty much anything I could think of. Set up with 17" street wheels.
It was a blast to ride (Wheelie machine) but it still topped out at about 100MPH.
show you doing the work
Those are not factory machine marks on the deck surface.It is the head gasket imprint,
That's funny because if I take the head off after I've already milled it there are no new marks....
You really think the head is that soft or they've torqued it down so hard as to leave permanent indentations?
Yes
Aluminum vs steel
I need you on my team, are you looking for work?
I have been working at a well known VW aftermarket shop on the west coast for the last 24 years.I enjoy porting VW and motorcycle heads on my free time.Where are you located?
i like watching your videos ,.. u do good work ..i had my head porter but the guy that did it didn not polish the exhaust...he told me that it doesnt reall make a diference ..do u have any thoughts about that?
Dear Mr. Boston,
I have a 2006 Yamaha R1 50th Anniversary edition. I live in Miami, Florida. How much would it cost for you to port the head valve exactly the same way as in your video? Please let me know. Thank you and take care.
Message sent.
I would like to know how much a r1 would gain with a job like this?? And how much cost would be. Does the head come back ready to install or does all of the valve adjustments need done to proper spec.
Gains of 10-05 peak HP with good gains all throughout the rev range.
Email wfofz1@hotmail.com for pricing and options.
What do you mean by 10-05 hp?? 10-15 perhaps?? If so wow my head will come to you the first time it’s off. That’s awesome. Mine has only 4,000 miles on it and I’m not sure I’m ready to go pulling it apart but for 10/15 more hp plus gains throughout the rev range that’s impressive for sure. Would the head come back ready to install or would the lash adjustments still need done??
Can I buy that head? Please
That head belongs to Brian. I can do another one for you if you'd like.
wfofz1@hotmail.com
Can it be done with the engine still on the bike?
It can. You just have to remove the cylinder head. I have found that it is much easier to remove the whole motor because then you can work on it while it sits on s bench rather than on the ground.
Terrible audio wow
Have a newer camera now= better audio