Recent posts

#1

Turning Wrenches / Re: Torque spec for reproducti...

Last post by MRDRcycle - June 24, 2026, 10:52:58 PM

 

#2

eBay/FB Marketplace/Craigslist watch / Rough RD400 Daytona basket cas...

Last post by 1976RD400C - June 24, 2026, 06:24:10 PM

https://www.ebay.com/itm/188526106097?mkevt=1&plmtId=1110100101&mesgId=4001&mkpid=0&emsid=enull.m161499.l174141&mkcid=7&ch=osgood&euid&bu=43209745197&trkId=4b6c5837-5f00-3f28-9fd0-354bc7e1439a&cnvId=a7fb74a1-c76a-4a5d-81a4-a4efd73d9c0c&osub=-1%7E1&crd=20260624115404&segname&recoId=188526106097&recoPos=1

#3

Micro Muscle: Under 100cc's / 1961 Yamaha MF1

Last post by Rizingson - June 24, 2026, 05:13:21 PM

Not much muscle here, but has many unique features, plus not something you'll see these days.
    After sitting for many years, this 65 yr old Yamaha is getting a new lease on life. Doing what it was meant to do, just cruising some country lanes. I took it out for its new maiden voyage and put about 6 miles of uneventful riding on pavement and some gravel just trying to build some trust in the little fellow. Cruising at 30 mph is definitely slow but can be a little therapeutic. Top speed is claimed to be just over 40 mph but I don't like to run the motors on my vintage bikes that hard, especially when no parts would be available. I'd prefer it had one more gear as it had the power to pull it. Shift pattern on this 3 speed manual transmission is a rare 1 up and 2 down. Here's a link to it's first riding video and a few pictures I took while I was riding around.

#4

Haus of Projects / Re: RD400 Project

Last post by Aaron Russell - June 24, 2026, 04:51:55 PM

Old setup weighs 13 pounds, so nice little 5-6 pound savings.
The funny part is the old stock rotor weighs 5.5 pounds

#5

General Chatter / Re: duties, taxes,and fees

Last post by 1976RD400C - June 24, 2026, 01:18:44 PM

I'm a bit worried if I don't pay FedEx they will turn it over to a collection agency.

#6

Turning Wrenches / Re: 72 T500 carb weirdness (l...

Last post by m in sc - June 24, 2026, 06:30:53 AM

correct on the jet tubes.  as far as the torque,  having literally just done it back to back if its anything, it's the change in the later motor intake length or airbox. my 0.02

#7

Turning Wrenches / Re: 72 T500 carb weirdness (l...

Last post by teazer - June 24, 2026, 12:06:48 AM

I was under the impression that a 188 is the round jet equivalent of a 159 series. That's according to my measurements and notes.

For some reason I have a dyno chart that suggests that early carbs made more low end and later ones made more at peak, but I have no details of the tests.

#8

General Chatter / Re: PJ1 Satin Black case paint

Last post by MRDRcycle - June 23, 2026, 11:09:27 PM

Thanks. I think I got a bad can for sure. The low gloss duplicolor paint worked well.

#9

Turning Wrenches / Re: 72 T500 carb weirdness (l...

Last post by m in sc - June 23, 2026, 10:52:23 PM

fast forward a few yrs..on the 2nd t500,,i was also trapped with stock early carbs. i had a bunch of spare parts, but all early internal vented bodies. so i compared and the only difference seemed to bethe lack of an external vent, so I made one. drilled and removed a brass ball from a cross port and fit a 188-p4 jet tube and 5fp17 needle,  stock for 73 and up. viola! carburation, sorted.  this one will stay stock (the 71) but its just dismal the factory setting pre 73. the current replacement is a 159-p4 jet tube,  but these require a,hex jet vs round. as an fyi. however, what im going to do is retrofit a set of vm34s i have for the black 72. endless... lol.

#10

Turning Wrenches / reproduction caliper

Last post by MRDRcycle - June 23, 2026, 10:46:53 PM

Nevermind the torque spec. The caliper doesn't appear to fit/seat well.