Ollie 's 750/4...

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Prof
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Ollie 's 750/4...

Post by Prof » Wed Feb 25, 2009 2:06 pm

Email from Ollie...

OK I’m gunna post a picture of the rolling chassis. I fitted the front end this afternoon.

Now I can see how that basket case looked before it was pulled off the road.

Image
As you can see from the pic, the lower frame rail is far from parallel with the road.

I can do several things and I need some input.

First option is to cut the frame and weld in some slugs that will stretch the front frame tubes, alter the rake a bit but leave me with standard trees, and the bottom rails, level with the road

The second option is to cut the frame at the neck and alter the rake angle of the neck, leaving the stretch of the frame the same.

Next option is to have a set of raked triple trees made that will also level the bike out but also interfere with the trail and handling. Keep in mind that this bike will never see a race track.

Personally, I'm with the slugs in the front frame rails.

A little cut will also be needed to the backbone, and that’s OK as well.

The opinions of the esteemed members of this illustrious forum are now required.

Cheers Olly
Chopit'nrideit... Prof

Chucky
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Post by Chucky » Wed Feb 25, 2009 2:46 pm

Well my opinion is dont modify the frame at all, just shorten up the fork legs to get the bike sitting level it'll look cool as hell and handle well.

chopperal
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Post by chopperal » Wed Feb 25, 2009 2:56 pm

Wot he said

al :)

78gold
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Looks

Post by 78gold » Wed Feb 25, 2009 3:38 pm

Well guys,
IMHO :roll: if you want a compact bobber look then shorten the fork legs and you will get a tidy bike that will handle well.
However if like me you like the more chopped look with plenty of open space around engine etc, which I think really sets choppers apart from modern bikes, then I would go with the slugs in the frame rails. Bearing in mind your comment about not hitting the race track handling shouldnt be greatly affected.
Anyway since when did a chopper put handling ahead of beauty :lol:
Regards
Nigel
Nigel
78 Gold

Cromag
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Post by Cromag » Wed Feb 25, 2009 4:14 pm

check out some fairdinkum ol skool chops, plenty had that canted up at the front look, personally i think it looks fantastic, keep it as it is.

If you end up shortening the forks, just cut some PVC two bits to the same length, and slip them over the damper rod..it'll stop the forks reaching full extention and its reversable if ya change your mind.

Keep the pics coming.

Prof
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Post by Prof » Wed Feb 25, 2009 4:24 pm

I've ridden a few bikes with stock length forks and rake recently and am horrified at how unstable they are. Knowing what (I think!) I know about rake and trail plus some interesting on road experiences, there is no way I would build a bike with less than 40 degree rake and 4" extensions. Much more pleasant than stock by the time you hit 2nd gear and definitely much safer.

In your case, lengthening the down tubes may be the better way to go rather than raking the steering head. Reason I say this is two fold: 1. it will be easier than cutting and rewelding the lower top tube. 2. you can get away with less rake with the same length forks.

You can also drop your front a couple of inches with a 19" front wheel which will also have less flop at very low speed. Twenty and twenty one inchers were originally used to get some height and trail with out the cost of extensions.

40 degrees is probably getting to the max you want with telescopics.

Raked triple trees are out unless the trail you end up with is over 6" which it won't be in this case. As laid out on the "Definitions" webpage raked triple trees are only safe when they are used to bring trail back to no less than 3 1/2".
Chopit'nrideit... Prof

pommychopper
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Post by pommychopper » Wed Feb 25, 2009 5:52 pm

Shorter forks. :D

Bacca

Post by Bacca » Thu Feb 26, 2009 12:28 am

Try slipping the forks through the trees a couple of inches to shorten the forks & see how it looks.
It would be past the 550mm rule at present wouldn't it be?
Weight of engine etc would bring the forks down a little too.

I don't mind it how it is either, just like the old chopper pics in the '70's mags.

Bearcx
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Post by Bearcx » Thu Feb 26, 2009 10:38 am

I'd make it parallel to the ground, so the seat brace is vertical.
The brave may not live long, but, the cautious do not live at all.

Neo Dutch
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Post by Neo Dutch » Fri Feb 27, 2009 5:43 pm

Slide the forks down through the clamps until it sits level. Get another top clamp and stick it on the top of the tubes, stick on some bars and there you go..... Instant coolness.
Don't let your luggage define your travels.

74chopper
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Post by 74chopper » Sat Mar 07, 2009 10:18 am

looks great as is mate, when you put pipes on that baby shell be pretty close to the ground
Cheers Rob
750/4 choppers Rock

roach
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Post by roach » Sat Mar 07, 2009 11:03 am

by the time you throw the motor and everything else in the forks will drop a few inches from all the weight and itll sit pretty rite

chopperal
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Post by chopperal » Sat Mar 07, 2009 5:45 pm

Yoiu could also slide the forks up the trees till it sits how you want it
then tighten the trees and put a set of clip ons on the extra. :D


cheers, al :)

Neo Dutch
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Catch up.

Post by Neo Dutch » Sat Mar 07, 2009 10:38 pm

Welcome to last Friday Al.
Don't let your luggage define your travels.

chopperal
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Post by chopperal » Sun Mar 08, 2009 9:46 am

Thanks for the welcome ND

You wouldn't need another set of trees.

If he slid the forks up through the trees (I think that's what you meant too)
he'd probably have enough fork protruding above the top tree to clip
the bars to.

So, the bars would clip ABOVE the trees





cheers, al :)

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