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Old 07-13-2009, 05:18 PM   #1
peterdallan
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Default Best donor bike

Hi,

Going through this forum, virtually all the Triumphs feature a non duplex frame. Is this just for styling or because they are more plentiful. I would like to build a Triumph bobber style bike, is there an 'ideal' donor bike to base the build off?

cheers

Peter
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Old 07-13-2009, 05:26 PM   #2
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Default Re: Best donor bike

If you mean "duplex" in the purely traditional sense, as in the one Triumph used from 1960-'62.....well, the oil-bearing frames started in '71 with "duplex" dual downtubes.

And those oil-frames can be fitted with weld-on rear section, or easily cleaned up for a swingarm custom. I suppose "bobbing" is in the eye of the beholder, these days.

But yes the most common 650 '63 - '70 frames were single-downtube.
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Old 07-14-2009, 02:40 AM   #3
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Default Re: Best donor bike

This is the frame I am looking at.

Any thoughts to suitability?

http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=330343526536

Peter
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Old 07-14-2009, 06:58 AM   #4
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Default Re: Best donor bike

Quote:
Originally Posted by peterdallan View Post
This is the frame I am looking at.

Any thoughts to suitability?

http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=330343526536

Peter
It depends what you want to end up with. The number plate chasers are on it already so it will go for a fair bit more. Why not get a single downtube and a letter from the science museum or owners club for dating for a quater of the price?
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Old 07-14-2009, 07:49 AM   #5
M.O.Ther
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Default Re: Best donor bike

Just an opinion, but I would think you would be a lot better off starting with a complete motorcycle. Starting with just a frame will nickle and dime (or pence and pound) you to death and you'll spend A LOT more money in the end.
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Old 07-14-2009, 08:02 AM   #6
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Default Re: Best donor bike

i agree with M.O.ther, i'd start with a complete, running bike, unless you've done this before. i'm guessing you HAVEN'T done this before, judging by your inquiry. and there's nothing wrong with that.
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Old 07-14-2009, 08:32 AM   #7
peterdallan
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Default Re: Best donor bike

Hi,
Thanks for the advice. I will go along the route you suggest and look for a complete bike.

Question, and I know this is subjective, but is there a model that has particularily lent itself well to a bobber conversion, assuming not too bothered whether unit or pre unit?

Peter
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Old 07-14-2009, 10:31 AM   #8
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Default Re: Best donor bike

I agree about starting w/ a complete bike. As far as an ideal donor, well there are alot of opions. Pre-units are expensiveto buy and to rebuild. For unit construction (pre OIF's) 69 and 70 are great, but pricey. To save alot of dough, look for an OIF model. They're not as collectable, so they're alot more affordable. And they're more pleantiful. But they do require a weld on hard atil instead of the bolt on varity available for pre-OIF's. Also, TR6's (single carb heads)Trophys and Tigers tend to be a little cheaper then the more famous Bonnivilles. I've never found the performance to be noticably diffrent, infact the single carbs produce more bottom end torque. And they're eaiser to tune. Check out the OIF thread for some ideas. Oh, one more thing. The trans on 71 and 72 uses a leaf spring for the index instead of plungers. They suck to work on! And, the early 5 speeds(73-74) had issues with jumping out of gear and poor shifting, But don't let this scare you away from one these bikes if the deal is good, they can be made to work properly. So for my money I would look for a 76-79, 750cc.if you don't mind that they shift on the wrong side. Plus they have disc brakes.

Last edited by speedfiend; 07-14-2009 at 12:19 PM.
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Old 07-14-2009, 12:44 PM   #9
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Default Re: Best donor bike

Read this please:

http://www.jockeyjournal.com/forum/s...h+build+bobber

This guide will get you started right.
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Old 07-14-2009, 01:26 PM   #10
peterdallan
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Default Re: Best donor bike

cheers everyone, food for thought there.

Appreciate it.
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Old 07-14-2009, 02:27 PM   #11
Destralo Roach
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Default Re: Best donor bike

Quote:
Originally Posted by 6T Sinner View Post
Read this please:

http://www.jockeyjournal.com/forum/s...h+build+bobber

This guide will get you started right.

Nice one, when ya getting back up this way????

And remember that 80% of all britt bike got sent out of England, so finding a doner will be tough, I only seen a few when I was there back in the 80's....Roach.
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Old 07-14-2009, 10:52 PM   #12
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Default Re: Best donor bike

Roach,
No plans for heading North as of yet. The damn weather here is too nice! My Triumph's still in a million pieces but looks promising. As soon as it starts coming together I'll let you in on my photos... Keep the faith!
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Old 07-14-2009, 11:00 PM   #13
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Default Re: Best donor bike

Lets not forget time....... which alot of us lack!


Quote:
Originally Posted by M.O.Ther View Post
Just an opinion, but I would think you would be a lot better off starting with a complete motorcycle. Starting with just a frame will nickle and dime (or pence and pound) you to death and you'll spend A LOT more money in the end.
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