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Author Topic: TRIUMPH T20 CUB - MODIFIED  (Read 25968 times)
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Old Scrambler
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« on: May 22, 2011, 07:32:17 PM »

Hello to the group......or hopefully a few of you experts.  I visited the salt-flats for 5 days during the 2009 BUB event and got to meet several teams........most notably for me was Tom Mellor and his Trident.  I loved it but did not intend to return until I came up with a change of plans in the fall of 2010.  I had a basket-case '62 Cub that I thought would make a good looking flat-track replica to use as a pit bike.  I am mostly an idea person with only basic skills regarding mechanics and none for metal fabricating.  I don't like electronics and I can't do body work.  What I have done is research the basics and locate the local professionals to handle the things I can't do. About the fanciest wrench I own is a ratchet and socket set, and I can do a little polishing.

OK, enough about what I can't do........or don't know how to do...........I have been riding motorcycles since 1966.....mostly HONDA but a few others along the way including a '57 T110 Chopper. I used a 650 single dual-sport for a pit bike on the salt in 2009.

Back to the Cub..........I noticed that a few others had built replica flat-trackers so I decided to do something different.  My local machinist and biker expert agreed to work for SMALL $$$ and together we would build a bike to compete at Bonneville.  I figured for once in my life I would do something for real instead of just watching and dreaming.  The Cub seemed like a practical way to go fast slowly........ha ha.

I starded with a frame and motor but soon learned a later model had better main-berings. In November I started hunting for parts. By January  I came across a modified head and had gotten to know the bBritish suppliers so well that they had sent me Christmas cards. Hear is a look at the basic motor build........... 


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* DSCF4009.JPG (45.02 KB, 640x480 - viewed 292 times.)

* DSCF4099.JPG (62.6 KB, 640x480 - viewed 309 times.)

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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
Old Scrambler
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Going Fast - Slowly




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« Reply #1 on: May 22, 2011, 08:25:10 PM »

The motor has been together since February and numerous parts have been gathered to put together a modified frame.........I am running 21" wheels front and rear...........extended the swingarm using two originals and some bracing.........found some 30mm Ceriani forks.........and now fabricating alloy oil and gas tanks.  I would post more pics but the computer tells me this file name is already used.......help!
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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
Koncretekid
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« Reply #2 on: May 23, 2011, 10:23:48 PM »

Hey Old Scrambler!
Your motor is looking great.  You know you'll have to run against the 250's at BUB and SCTA, but if you use the stock venturi sized carb and a stock type exhaust system, I believe you can run M-PP (no record showing in 2010).  That is, modified frame with stock engine.  Internals can be modified as much as you want as long as you use the stock cases, cylinders and heads.  Just a thought.
As for posting more photos, you should be able to just log into the forum, and click on reply to your own post.  Don't try to change the subject line; just add in more text and click on "Additional Options", and add your new photos.
Tom
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We get too soon oldt, and too late schmart!
Life's uncertain - eat dessert first!
Old Scrambler
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Going Fast - Slowly




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« Reply #3 on: May 25, 2011, 12:35:53 PM »

I know how to go slow........but I don't know how to add to my own posts........several attempts tell me the file has already been posted.
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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
Seldom Seen Slim
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Nancy -- 201.913 mph record on a production ZX15!


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« Reply #4 on: May 25, 2011, 01:23:31 PM »

If, for instance, you're trying to post a photo - the file name may have already been posted by you -=- like maybe as a different photo but the file name got reused.  In that case you're usually best to post the photo to a file sharing site (Photobucket, for instance) and then link the photo into your post.  I've often tried to simply rename a photo (when presented with the "filename already used" message) only to find that I still can't get it to post.  So -- the Photobucket trick will work for sure.

If you're new to photobucket (or that ilk of sites) drop me a note and I'll try to walk you through the process.  Best -

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Jon E. Wennerberg
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« Reply #5 on: May 25, 2011, 02:14:09 PM »

Hey Old Scrambler!
Your motor is looking great.  You know you'll have to run against the 250's at BUB and SCTA, but if you use the stock venturi sized carb and a stock type exhaust system, I believe you can run M-PP (no record showing in 2010).  That is, modified frame with stock engine.  Internals can be modified as much as you want as long as you use the stock cases, cylinders and heads.  Just a thought.
As for posting more photos, you should be able to just log into the forum, and click on reply to your own post.  Don't try to change the subject line; just add in more text and click on "Additional Options", and add your new photos.
Tom

Tom,
I'm new to this, but in my 2011 SCTA rulebook, on page 111, it says you can run any engine you want in a modified frame class EXCEPT UG, UF, P and PP.  I have no idea if BUB lets you run production engines in modified categories, but that's why there's no record for that class in the book.  I like both of your projects a lot and at first considered building a bike in the 250cc or 350cc classes, and always spend time looking at the little bikes at speedweek.

~Scott
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Nortonist 592
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« Reply #6 on: May 25, 2011, 04:34:21 PM »

There is no modified frame / production engine class.  If you run a modified frame with a production engine you will be runnng against modified engines.  Also as you are running a Triumph engine you will have to run a Triumph frame to be in the modified class.  Page 114.
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Get off the stove Grandad.  You're too old to be riding the range.
Koncretekid
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« Reply #7 on: May 25, 2011, 09:02:00 PM »

In the BUB rules, it only says you can't run a production motor in A, APS, or S (page 44).  A friend of mine holds the 250 M-P record on an RD250 modified frame, stock engine, so I guess that's allowable. There are actually lots of examples in the BUB records, including some with MPS-P. I admit I haven't studied the SCTA rules.
Tom
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We get too soon oldt, and too late schmart!
Life's uncertain - eat dessert first!
Stan Back
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« Reply #8 on: May 25, 2011, 09:34:29 PM »

With only a little bit of study, you'll find a class (maybe not presently occupied) for perhaps anything.  It must be kinda a sport to pick a new un-occupied class every year.  Four miles and you're done.  the big complaint is you have to actually fit in, unlike other places.  But there's plenty of holes.  Fill one this year, paint the seat green next year -- new class.

(Too many cervezas?)
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wobblywalrus
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« Reply #9 on: May 25, 2011, 09:48:13 PM »

Our team ran modified partial streamliners with production engines in the AMA class in MPS-P.  The rules are clear and easy to follow.  "Modified" chassis rules supplemented with "Partial Streamlining" rules and the motor meets "Production" rules.  There is a lot of freedom in this class to build a nice and affordable lake bike.
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Nortonist 592
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« Reply #10 on: May 26, 2011, 12:22:26 AM »

Sorry I was thinking of SCTA rules.
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Get off the stove Grandad.  You're too old to be riding the range.
Old Scrambler
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« Reply #11 on: May 26, 2011, 09:59:21 AM »

Great Discussion............I need to do more reading.............trying more pics.........your comments are welcom regarding rules for my hoped for build to meet the M-PG class......

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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
Old Scrambler
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Age: 70
Location: Plymouth, WI
Posts: 629


Going Fast - Slowly




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« Reply #12 on: May 26, 2011, 11:18:36 AM »

Thanks to SSS...............


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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
Seldom Seen Slim
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Nancy -- 201.913 mph record on a production ZX15!


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« Reply #13 on: May 26, 2011, 11:30:23 AM »

Scrambler:

Next we'll work on putting some comments and maybe some blank space between the photos -- but you've got the basics down now.  Quick learner. . . cheesy
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Jon E. Wennerberg
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 Skandia, Michigan
 (that's way up north)
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Old Scrambler
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Age: 70
Location: Plymouth, WI
Posts: 629


Going Fast - Slowly




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« Reply #14 on: May 26, 2011, 01:16:18 PM »

Since SSS was so helpful..........I'll try a few more............
This is the rear wheel modified from a Honda XL350 front


The fuel tank mock-up...........will have a Monza cap but need to get the carb mounted before final design
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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
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