Mark Morrow posted these on Facebook. Coming soon for your RD from vintageperformanceproducts.
Looks like they will be available in 6 different dome options..
oooooooooohhh :celebrate: :metal: :cheerleader:
they look great. Keep us informed if you can. I may be interested
Those must take some run time! Not getting chatter on those fins has to be quite tricky.
I mean, I'd buy 'em lol.
Quote from: sav0r on September 07, 2022, 08:28:36 AM
Those must take some run time! Not getting chatter on those fins has to be quite tricky.
Think I read 6 hours on the fins.
6 hours! I guess that's why the sunburst heads use heat-sink extrusions...
Great! Something else I need to buy. Billet stuff is like an addiction. Buy one piece and you're hooked. I almost went broke on billet RC car parts before. I definitely appreciate the stock-appearing design.
Since the B8HS are NLA would it be possible/worthwhile to use the opportunity to change to a spark plug with better availability? Or is using the resistor plugs no problem at all?
IR8D8R
resistor plugs arent an issue. just use non resistor caps. and resistor plugs are NOT an issue on a cdi, been running them for literally 15 years w zero plug issues.
zero resistance is an chooseable option:
https://www.economycycle.com/shop/yamaha-rd250350400r5ds6ds7-parts/electrical-ignitions-lighting/ignition/ngk-5k-spark-plug-resisitor-cover-lb05fp/
Quote from: IR8D8R on September 07, 2022, 02:03:57 PM
6 hours! I guess that's why the sunburst heads use heat-sink extrusions...
Great! Something else I need to buy. Billet stuff is like an addiction. Buy one piece and you're hooked. I almost went broke on billet RC car parts before. I definitely appreciate the stock-appearing design.
Since the B8HS are NLA would it be possible/worthwhile to use the opportunity to change to a spark plug with better availability? Or is using the resistor plugs no problem at all?
IR8D8R
I hope he makes them for 3/4" reach plugs (i.e B8ES) instead of 1/2" reach. I believe the 400 and later 250 OEM heads had just that, 3/4" reach plugs.
These make my sticker peck out. DEFINITELY need a set once available!
I race with the owner of Vintage Performance in USCRA. He's a really solid dude and a huge fanatic of 2 strokes. His fully built Kawasaki H2 race bike is gorgeous and wickedly fast. I've chatted with him about this project and it's really cool. Looking forward to a set for my race RD.
Pics of his H2 and my RD attached.
Working on the theory that if your bike is a deathtrap POS and you add new shiny bits, it will at some point cease being a deathtrap POS and become a nice machine?
At least by popular consensus since there's no real rating system.
Asking for a friend.
IR8D8R
this is correct. :patriot:
Looks like they will be $765
Set installed on mark morrows race bike to some testing
Seems like the "deathtrap" verbiage ties into the "Dumb idea. I'm doing it anyway" 2 stroke T-shirt concept that has been previously mentioned.
Quote from: IR8D8R on September 26, 2022, 03:49:08 PM
Working on the theory that if your bike is a deathtrap POS and you add new shiny bits, it will at some point cease being a deathtrap POS and become a nice machine?
At least by popular consensus since there's no real rating system.
Asking for a friend.
IR8D8R
i resemble that remark !!! :whistle: :whistle:
What do you guys think of the VP logo on the sides of the heads? I would rather not have the VP on them, maybe I'll change my mind later.
Quote from: Hawaii-Mike on September 27, 2022, 07:49:15 PM
What do you guys think of the VP logo on the sides of the heads? I would rather not have the VP on them, maybe I'll change my mind later.
Looks like he will make up a bunch of heads and only cut the domes and oring grooves when an order is placed. May not be an option on the logo. I think it looks alright with the satin finish
Here's a quote fron Mark Morrow on his race yesterday:
"Huge thanks to all of my sponsors, but especially my newest sponsor, Vin Borbone, who created some pretty trick heads that turned out to be simple, easy, bolt on performance. The bike was a rocket ship from the first time I opened the throttle and I swear, it's gained nearly 500 more rpm in powerband width, as well as more power overall! "
Those heads are beautifully machined.
Now listed on EBAY!
https://www.ebay.com/itm/334603396230?hash=item4de7eaa486:g:KPkAAOSw5k1jVd0s&amdata=enc%3AAQAHAAAA4GJi6bdcLcqUGsu1RLvIdRf05BGuPK5m3xm7HDtT1OnRB4GV7qARBrxG3oOkuCPOfjnj50O1V22Z%2Fben6QbTXI1i2qhmvx2xXeUsGMX1wAKGC0H04KisIFYKZi2qVVZ3pXjFBng9hU2G35s3wUUe1gEQ6dfbT28l3oc6531XhjJ0K99lUt9wzgU40UC0uLoZOdUUN7sdEXKJHqIYv0qz%2Fep%2F5Jcm18k6ZNiYuOyoCpa7QlJXeEv6RxGXKZfOP2B0a0RtGSF0XjI4NuvDYm%2FLc19NRDAS0OeMekjDOAQ4IRTT%7Ctkp%3ABFBMwvCq_4Fh
The heads look beautiful, but the ebay listing shows a dyno graph with a high of 43hp at the rear wheel...
Is that a good number for a 400 ?
What kind of rear wheel HP do they do stock?
Good Question. My interpretation of that chart was that with the billet heads there's a steady 1-2HP gain across the rev range compared to the stock 41HP.
I would speculate that the difference would be larger on a modified motor, but maybe not. I haven't tested different heads on an RD. Does anyone know what difference say a DG head made on a stock motor for comparison?
They do look beautiful though and the machining is amazing.