59 triumph bonnie TECH HELP NEEDED - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 59 (permalink) Old 07-25-2019, 09:39 PM Thread Starter
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59 triumph bonnie TECH HELP NEEDED

I found a barn find that someone just let go and was seeing if someone could help out in the Milwaukee area to do a valve lap on her one cylinder is at 155 and the other is 120 psi I was told this thing will not run like this
Any input would help me out tremendously also the carbs are all gummed up and cables were rotten any help buds would save me help me gain knowledge of this awesome bike
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post #2 of 59 (permalink) Old 07-26-2019, 11:07 AM
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More important is the condition of the sludge trap inside the crankshaft.

The likelihood is that a bit of running after sitting in an old barn with one valve open, will settle things down with respect to the valves & seats. BUT (and that's a big ol' but) it may also cause harm to the crank if it is getting insufficient oil flow!

Therein lies the dilemma - I was always overly tempted to just ride them and enjoy the bike rather than paying the big bucks to refurb or restore the bike to ensure a long, satisfying life.

Flip a coin and take your chances? It's YOUR decision, it costs less to rebuild an engine that hasn't failed...

...and last I checked, they ain't makin' them '59 Bonnies any more!

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post #3 of 59 (permalink) Old 09-08-2019, 08:53 PM Thread Starter
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Here are the pics of the bonnie as of now
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post #4 of 59 (permalink) Old 09-09-2019, 03:47 AM
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Hi Trumpetrider,
First you need to verify that the frame and engine numbers match, then you need to verify it is actually a 1959 first year Bonneville.
These are worth a small fortune if they are in original condition. (20,000 + in the UK)
http://www.classicbike.biz/Triumph/M...ALLmodelsC.htm
There were only about 1700 built in 59 and I expect that not that many survived, they almost immediately had a facelift where the nacelle clocks were changed for more sporty items.
It looks like the ‘chop’ on your bike was not that extensive, retaining lots of original parts. If you are very lucky you have a box with the original bits in.
This will still have some added value as a basis for someone to restore, but getting all the original items will be difficult.

As it is, get it running and enjoy it.

Regards
Peg.

Quick fixes are named after how long they stay fixed, not how long it takes to make them.

Last edited by Rancidpegwoman; 09-09-2019 at 03:56 AM.
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post #5 of 59 (permalink) Old 09-09-2019, 03:56 AM
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Originally in Light blue and orange, 451made in dark blue grey.
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Quick fixes are named after how long they stay fixed, not how long it takes to make them.
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post #6 of 59 (permalink) Old 09-09-2019, 06:47 AM
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If you want to bobber or chopper a Triumph I suggest doing it to some other model. As RPW said, if it is a true Bonneville and a '59 then - like RPW - work on getting it back to original. If you had this one original and in excellent condition you could build 2 bobbers out of other models and have change left over. In fact - if the motor is a genuine '59 Bonneville [and assuming the rest of the goods are just bits and pieces] - then the motor alone would be worth a good running '70's Bonnie.

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post #7 of 59 (permalink) Old 09-09-2019, 09:12 AM
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So, were you able to fire it up?

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post #8 of 59 (permalink) Old 09-09-2019, 02:00 PM Thread Starter
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no i didnt i dont have spark
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post #9 of 59 (permalink) Old 09-09-2019, 02:23 PM Thread Starter
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the title i have is t120027809
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post #10 of 59 (permalink) Old 09-09-2019, 03:35 PM
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Hi Trumpetrider
It looks like it is a very much sought after late 59 model.

Did you take the number off of:
A)The Frame
B)The Engine
C) Both frame and engine, this is most important for value, a matched numbers bike will be worth a great deal more than a mixed numbers bike.

I see your car is registered in Wisconsin, this information is useful in your profile as other members close to you can recommend good local services and parts suppliers.

If you want more information about your bike, manufacture day, original colours, where it was first shipped, etc. Then the original factory records are kept in the UK, by the VMCC.
They are quite strict with their information and won’t send it to just anyone, you have to send photos of the frame and engine numbers and a side view of the bike to show the bike is in your possession, (and their fee) then they will send you a typed out certificate with all of the details, in this case it is probably worthwhile as you have a sought after motorcycle.

https://www.vmcc.net/Factory-Records

Regards
Peg.

Quick fixes are named after how long they stay fixed, not how long it takes to make them.

Last edited by Rancidpegwoman; 09-09-2019 at 03:37 PM.
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