Author Topic: 350 trivia  (Read 873 times)

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Offline BS Mechanic

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350 trivia
« on: February 08, 2017, 10:59:45 AM »
Here's an interesting slip of paper I just found in a small BS labeled plastic bag. 

I believe it was included in the tool bag when I purchased my new 350 in 1968.

Looks like the bag originally held two #130 jets and this note.
I don't remember well enough to be sure though, that was a few years ago!!

Online moonpup

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Re: 350 trivia
« Reply #1 on: February 08, 2017, 11:09:23 AM »
Living in Texas, I shall make note of this!  lol
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Offline slawsonb

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Re: 350 trivia
« Reply #2 on: February 08, 2017, 12:09:17 PM »
I've always run 130's in AZ.
...bert

Offline BRT-GTR

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Re: 350 trivia
« Reply #3 on: February 09, 2017, 07:03:18 AM »
              Great find BS, nothing wrong with your memory, look after that scrap of paper.  This maybe explains why the 130s never got to the UK.     80 degs F was never heard of back in the 1960s !!!!!!  70-75 was a hot summers day !!  :(
   We get 80+ now  :D but I think the temperature reference was Rockford's covering their backsides in case of overheating problems.

   This was shown in a Rockford Service letter, BSG-0062, dated 10-1-67, which stated the 140s were for break-in only and a set of substitute 130s were packed with the tool kit after Ser No. 16T1646. No mention of 80 deg F !!  It also says with the 130s , the float level was 15/16'' and the needle jet clip should be in the second from bottom position. Where did all those 130 jets go ?
           Brian.
« Last Edit: February 09, 2017, 07:07:13 AM by BRT-GTR »
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Online farmerdl

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Re: 350 trivia
« Reply #4 on: February 09, 2017, 09:50:08 AM »
I wonder what happened to all of those 130s also.  Of the 13 350s to come into my possession in recent years exactly four have had the 130s installed.

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Re: 350 trivia
« Reply #5 on: February 09, 2017, 10:35:32 AM »
Of the 6 sets in my possession, 5 have 130's and 1 (from Colorado) has 120's....
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Offline hardy

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Re: 350 trivia
« Reply #6 on: February 09, 2017, 05:58:46 PM »
Another thought, what about factory fitted idle jets? My bike had #30s in it and when I order NOS jets from RC #30s arrived yet the manual states 22.5, any thoughts guys, esp those with multiple bikes ;)

Ryan

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Re: 350 trivia
« Reply #7 on: February 11, 2017, 12:21:43 AM »
Hi Ryan, I checked a couple sets today and both had 30's vs. the 22.5's in them. So now, like you, I too am curious as to .... what's up?  ;D
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Offline hardy

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Re: 350 trivia
« Reply #8 on: February 11, 2017, 01:54:10 AM »
There wa a post a while ago about it, stating they run better with 22.5s, but I'm yet to find a supplier for the odd thread sized jet (0.75 pitch vs 0.7)

Online moonpup

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Re: 350 trivia
« Reply #9 on: February 11, 2017, 11:22:01 AM »
Ok, I decided to go ahead and check all 6 sets I have and all 6 have the 30's in them.

The manual says 22.5 is the standard. So that means either....

1 - 6 different previous owners changed them to 30's. (for whatever reason)
or
2 - The 22.5 is a misprint in the manual.
or
3 - 22.5 is correct in the manual, but maybe there was a service letter recommending they be changed to 30's. (again, for whatever reason)
Confucius say... "Better to have Bridgestone than Kidneystone"

Offline davis

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Re: 350 trivia
« Reply #10 on: February 13, 2017, 07:19:06 AM »
Of the eight or so used carbs I have had about 2/3's were #130's. I believe the NOS set had #140's. Hardy, take a look at Sudco #004-005 for pilot jets that fit. Double check my notes, but you should find a range of pilot sizes there.

- Bob

Offline hardy

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Re: 350 trivia
« Reply #11 on: April 13, 2017, 02:45:50 AM »
Just curious, but how many people are actually running 22.5 idle jets?

Online farmerdl

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Re: 350 trivia
« Reply #12 on: April 13, 2017, 04:04:56 AM »
My riders have 22.5s.  Needles all have clip in second from bottom grove. Everthing that I've seen with 30s was still running 140s with the needle clip clear in the top groove. Remember most of these bikes were sold by shops that were not dedicated bike shops and few people ever attempt to properly jet whatever they are riding. They get on, they start it, and it runs.  They're happy.

Offline BRT-GTR

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Re: 350 trivia
« Reply #13 on: April 13, 2017, 08:08:09 AM »
            Both my Rockford's GTR/GTO (late) manuals state 30 as standard for the pilot jet, another can of worms!,  which manual states 22.5 ?
 
    BS service letter BS-0067 states '' The Bridgestone 350 GTR will operate quietly - even at idle  (LOL)- and deliver maximum performance if it properly tuned ''.    It stresses the importance of idle speed sync for smooth slow running. I am having limited success in syncing my GTO tickover so decided to do some research and found this guide on the Kawatriple.com site, which use similar Mikuni carbs :-
           
                   http://kawtriple.com/mraxl/carb/carbadj.htm

   Lots of good tuning advise in here. I notice it does say that if the air screw adjustment is outside of the range 1 1/4  to 1 3/4 turns open, the idle jet is too small or too big. Our starting point setting is 2 turns open ! OK, this advise may not be applicable to our engines due to the disc valve induction but did BS move to a smaller 22.5 idle jet on some machines or was it a dealer/user mod. ?
     As soon as I have finished derusting the fuel tank and put some fresh juice in her, I will have another go at syncing the cylinders and let you know how I go on.
           Brian.
« Last Edit: April 13, 2017, 08:24:30 AM by BRT-GTR »
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Online moonpup

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Re: 350 trivia
« Reply #14 on: April 13, 2017, 08:32:01 AM »

            Both my Rockford's GTR/GTO (late) manuals state 30 as standard for the pilot jet, another can of worms!,  which manual states 22.5 ?
 

It's on the Technical Data page in the service manual that is in the downloads. However, it's not listed in the same manual I have in my possession.....?????
« Last Edit: April 13, 2017, 08:38:44 AM by moonpup »
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Online farmerdl

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Re: 350 trivia
« Reply #15 on: April 13, 2017, 09:30:10 AM »
Ok, I decided to go ahead and check all 6 sets I have and all 6 have the 30's in them.

The manual says 22.5 is the standard. So that means either....

1 - 6 different previous owners changed them to 30's. (for whatever reason)
or
2 - The 22.5 is a misprint in the manual.
or
3 - 22.5 is correct in the manual, but maybe there was a service letter recommending they be changed to 30's. (again, for whatever reason)


Sudco has them, or did two years back.

Online moonpup

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Re: 350 trivia
« Reply #16 on: April 13, 2017, 09:32:12 AM »
Ok, I decided to go ahead and check all 6 sets I have and all 6 have the 30's in them.

The manual says 22.5 is the standard. So that means either....

1 - 6 different previous owners changed them to 30's. (for whatever reason)
or
2 - The 22.5 is a misprint in the manual.
or
3 - 22.5 is correct in the manual, but maybe there was a service letter recommending they be changed to 30's. (again, for whatever reason)


Sudco has them, or did two years back.

Thanks, I'll check that out...  8)
Confucius say... "Better to have Bridgestone than Kidneystone"

 


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