Hi all.. new to the site but see a lot of experience being shared here.. hoping i can impose from time to time.

I am gearing up for a complete restoration of a 1970 360 RT1 that Ive held onto since High School.. The bike has been in dry storage, dry climate.. 

As Im doing the takedown i am sorta shopping  for parts. 

Regarding part numbers in my Parts and Service manual 70-71, many part numbers are still available as the book is calling out.. 

I read a article here written by administrator that laid out a lot of info..

First 3 numbers, first year used.. ie:214 / 1970

Next 5 are the part id.. prefaced by a W if memory serves referencing a group..  ive not seen that yet

Next 2 a revision.. 

My question to the experts concerns interchangeable parts through models and years. 

For example:

My manual calls out a lighting coil (2) / stator plate
275-81314-20

Is a 233-81314-20 the same application/part .. just a earlier year and would it work if that part was needed. 

Id appreciate any incite. 

Cheers,

Drac


 

Hi,

I am by no means an expert but I was pointed down this route when I first joined.  if you look in the “how to” section in the tech library 
there is a thread called decoding Yamaha part numbers (or something like that).

yamaha-enduros.com/index.php/workshop/de...-yamaha-part-numbers

this shows you the first 3 numbers are actually the model code. 

for fitting to various models I was pointed to the cmsnl web site.  www.cmsnl.com/en-gb/yamaha-rt1-1970-usa_...ghting-2_2758131420/

Look up you part and it shows what other models that part was used on. It’s a really good place to start looking.   The partzilla website also does this I think. www.partzilla.com

hope this helps and I am sure I will be corrected if incorrect.

cheers. 

I agree with Ian (Tinker man).

Generally I try to stick to the specific part for a specific bike. However, it is quite possible that other parts can be "made" to fit with little bother.

Regarding your lighting coil, CMSNL has a photo of the 233....... part, and this has 5 wires. There are new 275..... parts on fleabay, and these show 4 wires, so maybe a fitting issue here. Also, they might be different sizes.

CMSNL and Partzilla often show if a part has been replaced (aka superseded). 

Regarding your stator plate question . The 233 prefixed plate is for a 250 primarily  . The 275 plate is for the early 360 . 
The early 360 had a cam advance mechanism in the flywheel . The 250 did not .
The flywheels and stator plates have to match , as the ignition points are mounted in slightly different positions .
Technically you could install a complete 250 system on your 360 , but that could be problematic .
The 360's had a bit of a reputation  for a nasty kickback , when attempting to start .
With the 275 stator , the timing is retarded for initial starting . With a 233 stator it would be on full advance already .
In 1971 Yamaha fitted a compression release to the cylinder to further assist starting , and in 72 abandoned the 
ignition advancing stator and flywheel . It has been suggested previously that rearding the ignition from factory settings
a bit , also reduces the kickback tendency .

You left off "signed, Chester"
Need to be old to get this, I think

You kind of answered your own question...  in general, Yamaha is pretty darn good about KEEPING the part numbers the same for parts that are the same.  

For example, a 1968 DT1 has the same front axle part number as a 1978 DT250 because the part is functionally the same.  They generally don't "rename" the same part every time a new model came out or you'd have a dozen different part numbers for that same axle.  

When you're talking about things like ignition systems, Yamaha often did keep the same "mounting" though the individual parts are often NOT the same.  For example, you can install a COMPLETE ignition (matched stator and flywheel assemblies) from a 1973 DT3 onto a 1969 DT1 but that does mean any of the individual ignition components will swap.  

Mark.. 

Thanks for that..

Yes, i get the infinite amount of part numbers that would create if every model had a new number.. 

It would be something if somewhere there was a crossover reference for interchangeable parts like one saw in the days of the old muscle cars.  

Every bone yard had one.. 

I appreciate your time and others who have responded.. 

 

There kind of is. But it's certainly not the be all, end all.  More of just a guide some people find helpful. zedder.com/

I have Zedder and it shows this:

part # 275-81314-20  70-71 RT1

part # 233-81314-20 69-73 DT250's and 72-73 RT2/3

take it for what its worth. 

Mark, 

Thanks for that link..  I’ve made a inquiry with Steve Zedder on the software via email..  waiting to hear back.  

Again, I appreciate your time and input..  

Drac