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Topics - 1976RD400C

#1
So my cleaner stopped working at the 11th month of a 1 year warranty. Emailed Vevor and they immediately replied and connected me up to the Chinese manufacturer. They said send a video showing what's up. I did. They very quickly asked if I could pull the bottom off and look at the circuit board and take a pic. They sent a video of how to disassemble. I looked and saw a resistor was damaged. Sent a pic. They said send a pic of the part number on the board. They said a new board is on its way shortly. 2 days later they send tracking number. 2 days later at 9:30am DSL delivers it, from China. It looks updated with a fan on it. Popped it in and bingo, all good. Wow!
#3
Out for Delivery

Out for Delivery, Expected Delivery Between 9:00am and 1:00pm

MELROSE, NY 12121

November 10, 2023, 9:02 am

 
Arrived at Post Office

MELROSE, NY 12121

November 10, 2023, 8:51 am

Departed USPS Regional Facility

ALBANY NY DISTRIBUTION CENTER

November 10, 2023, 6:00 am

Arrived at USPS Regional Facility

ALBANY NY DISTRIBUTION CENTER

November 9, 2023, 3:31 pm

Departed USPS Regional Facility

SPRINGFIELD MA NETWORK DISTRIBUTION CENTER

November 9, 2023, 2:44 pm

Arrived at USPS Regional Facility

SPRINGFIELD MA NETWORK DISTRIBUTION CENTER

November 9, 2023, 9:20 am

Departed USPS Regional Facility

KNOXVILLE TN DISTRIBUTION CENTER

November 8, 2023, 9:36 am

Processing at USPS Facility

HAZARD, KY 41701

November 6, 2023, 1:26 pm

In Transit to Next Facility

November 5, 2023

Arrived at USPS Regional Facility

KNOXVILLE TN DISTRIBUTION CENTER

November 4, 2023, 11:10 pm

Arrived at USPS Regional Facility

SPRINGFIELD MA NETWORK DISTRIBUTION CENTER

November 2, 2023, 9:16 pm

Processing at USPS Facility

SARATOGA SPRINGS, NY 12866

November 2, 2023, 12:07 pm

Arrived at USPS Facility

MELROSE, NY 12121

November 2, 2023, 8:54 am

Departed USPS Regional Facility

ALBANY NY DISTRIBUTION CENTER

November 2, 2023, 6:08 am

Arrived at USPS Regional Facility

ALBANY NY DISTRIBUTION CENTER

November 1, 2023, 2:50 pm

Arrived at USPS Regional Facility

JERSEY CITY NJ NETWORK DISTRIBUTION CENTER

November 1, 2023, 2:51 am

Departed USPS Regional Facility

KEARNY NJ DISTRIBUTION CENTER

November 1, 2023, 2:40 am

Arrived at USPS Regional Origin Facility

KEARNY NJ DISTRIBUTION CENTER

November 1, 2023, 2:05 am

Accepted at USPS Origin Facility

RAHWAY, NJ 07065

November 1, 2023, 12:50 am

Shipping Label Created, USPS Awaiting Item

RAHWAY, NJ 07065

October 31, 2023, 8:59 am
#4
Turning Wrenches / Bone stock bike jetting?
May 10, 2023, 05:29:37 PM
Do I dare put a 120 main in it? It has a 130 now and stops revving at 8000, even in the low gears. Stock is 115. Everything is stock, air box with snorkel, OEM air filer with tubes inside, exhausts, reeds. Non ethanol gas being used. It runs great other than the top rpm. As I recall they should hit 8500 going through the gears. Man, a stock 400 sure has some grunt in the mid-range.  :burnout:
#5
Show Off / My fleet of Yamahas, ready to roll
April 30, 2023, 01:09:38 PM
I like to let the YL feel like a big shot and lead the pack.  :vroom:

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#6
Turning Wrenches / IT175 pistoned RD400 motor
April 05, 2023, 09:17:08 AM
I bought a parts lot yesterday and it included a 400 motor with modified cylinders for IT175 pistons. It looks like it has a hot port job, big reeds, 34mm flatslide carbs, and is a 67mm bore. I'm a little bit afraid of it.  :eek:  Anyone have any knowledge on how well the pistons with a higher pin placement works out?

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#7
Page down to the sold ones also. Curious what the YL1 will bring too.
https://bringatrailer.com/yamaha/?q=yamaha
#8
General Chatter / Just wonderful, a Noreaster
March 14, 2023, 07:26:29 AM
It's only half way done with what's it's going to do.  Power just went out.
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#10
eBay/FB Marketplace/Craigslist watch / TZ125 on BAT
February 07, 2023, 10:06:52 AM
I hung out with a teenager at track days that had one of these. The thing would accelerate as fast as my hot rodded SV650 and when it came to braking and flicking it through the turns, the kid would go right by the guys on 600 SS bikes.  :thumbs:
https://bringatrailer.com/listing/1997-yamaha-tz125/#comments-anchor
#12
General Chatter / How not to pay tax on Ebay sales
December 16, 2022, 07:56:42 AM
I'll start a new topic on questions asked on SoCal250's post. This link explains how to deduct those 1099-K forms Ebay and Paypal will be sending out for anyone that received $600 or more in gross sales for your used stuff. You will be getting these 1099-K forms even if you got any money transferred to you through Paypal for any reason. I don't think friends and family payments will be included. This guy does a good job on how to file the proper forms to prove you didn't make money selling your used stuff that cost more than you sold it for and no tax is due.

https://www.youtube.com/watch?v=O_mz6Lk0alg&t=0s
#14
Turning Wrenches / Wossners in, my bike has its mojo back
September 16, 2022, 03:49:16 PM
All set with some new pistons. I did a compression check before I started it and was 145 on each cylinder. I'm going to check that compression often.  It started right up and sounded fine. Took it for its fist run and it runs much cooler and both cylinders are within a few degrees of each other, better than it has ever been since a restore 12 years ago. I have the HPI timing retarded a bit and now will advance it some for a better mid range. I still have no idea why the ProX rings failed. I sent a email to ProX asking about some identifing marks on the pistons to prove they are really ProX. No reply. No more buying pistons on Ebay for me. Fancy rearsets work good. Total cost for the failure about $700, crank rebuild, pistons, seals and gaskets. The crank was not new but it was well within spec and as the rings and pistons were getting torn up it took out a lower rod bearing.  :thumbs:


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#15
So, I tried these ProX pistons after using the 2 sets Wisecos for the last 10 years with no problems except a crack forming from excessive clearance, they didn't work out. I had about 150 miles on them and noticed the power was no where near the Wisecos. Anyway, I loaded my bike up along with my SV for a track day yesterday. After lunch I fired up the RD and the first run, down the straight I come, where's the power!? Not there. It was running 20mph slower compared to the Wisecos. Ran it for the one session and said I better park it. Tore it down this morning and wow. My cylinders are torn up and a another rebuild is needed. I don't get it. I scraped the coating off a little on the pistons, like the Chuck suggested, measured, set up clearance at .0019". Check cylinder taper and roundness, within .0002". Should be good to go. I don't think I did anything wrong?? I guess I'll try again. I almost looks like it was eating dirt but I have foam air filters. I never saw anything like this. It seems the rings didn't seat, maybe because of the coating? There is severe wear above the exhaust port and the piston skirt is wearing the cylinder below the intake port. The Wisecos didn't wear the cylinders anything like this severe. Contemplating what to do next. After riding the SV, I think the RD can barnstorm through the back section of the track better, it is so flickable compared to the SV that I have to plan and guide through the turns. I just want the power back like it used to have. I didn't take the kickstand off the RD and had a moment when it hit in a turn with a dip. The photographer was at that turn, maybe he got a pic.

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#16
Turning Wrenches / Clearance on a coated ProX piston?
August 04, 2022, 08:51:36 AM
I'm going to try a set of these on my bike after using Wisecos. Should I allow anything in the clearance for that coating to wear off? If and when the coating comes off how much smaller will the piston be? I have a real good hone and bore gauge and can get the bore just about within .0001"-.0002". I'm thinking set the clearance at .0018" measuring the piston with the coating on it???  Thanks

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#17
Turning Wrenches / Rebuilding an old Ebay crank
July 29, 2022, 08:37:27 AM
Maybe next time let go of the throttle when it starts knocking  :umm:

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#18
I bought this a couple weeks ago. Gave it a complete checkup. Hone and new rings, fix wiring, new battery, set timing, complete carb clean, new chain and sprockets, 15-40 oil in the forks, left side switches, shim washers on clutch springs to prevent slipping, a couple decals, and lots of cleaning. It runs great. What a hoot. Can't wait to get it out on the open road. Progressive Insurance says it will be $12 to add it to my existing policy. I see on BaT auction they are going for some nice coin.







EDIT: fixed image link code
#19
Turning Wrenches / Oil pump problem
June 13, 2022, 01:54:44 PM
I'm sprucing up the 100 Twin Jet and have the cylinders off for hone and rings. I noticed over the course of several days, the oil lines to the cylinders, that use banjo bolts to hold them on, are leaking oil out. Maybe about 1/4-1/2 teaspoon out of each line. The oil tank is full. I'm worried that if this isn't addressed, it will leak down oil into the motor while parked. Any ideas why the pump is doing this? Thanks