Triumphrat

nickletooth · 03-18-2008

hi guys, just about to get started on my front end conversion.to be honest i havent really done anything like this to a bike before so progress me be a little slow as i will be learning as i go.
i saw the nec thruxton and fell in love with it.and then saw a compleat 675 front end on ebay for 500 pounds, much cheaper than new ohlins with custom yokes.i figured if i get out of my depth or it just looks like too much cash to spend on machining i can just put it out on ebay again and go for the cbr600 f3 conversion i have seen posted here.
as you can see i have the f3 rear wheel i think it matches the daytona wheel pretty good.the 675 forks are 40 mm shorter than the thruxton but ithink that is ok, it should just give it a steeper rake.is rake measured from an imaginary 90 degree line from horizontal or from the bikes frame?if its from the frame then obviously the rake is the same no matter what forks i use?
any way i will try to post as many pics as i can and updates of my progress.i hope this thread will be of some use to anyone who drooled over the nec thruxton.

sweatmachine · 03-18-2008

Quote:

Originally Posted by nickletooth

it should just give it a steeper rake.is rake measured from an imaginary 90 degree line from horizontal or from the bikes frame?if its from the frame then obviously the rake is the same no matter what forks i use?

get an angle gauge with a magnet base, put it on the fork leg and it will tell you rake. A shorter front end = steeper (smaller) rake #s.

lookin good! I'm anxious to see your results.

texas94fs · 03-18-2008

yes yes I'm very interested in the results of this, that set up with some good rears and good tires should make the thrux handle like a 675 . . .hmm with a 904 and mikunis that set up could embarass lots of things! Best of luck!

Bottle_Fed · 03-18-2008

Very interesting, keep us posted

Greg

nickletooth · 03-18-2008

thanks for the encouragment.
i made a start this evening, the bikes up on stands, the front wheel is out,the caliper is tied back and the mudguard(fender) is removed.also the clipons headlight brackets and steering damper are slackend.i loosend the bolt in the top clamp ok but dont have an allen key bit large enough for the bolt in the bottom clamp.so i have stopped for tonight, i can pick one up tomorrow on my way home.
i've been using a haynes workshop manual its been pretty handy. i found it really usefull when i removed my carbs/airbox to install the fcr 39's
i know its a way to go yet but it feels pretty good to have made a start.

OKcarburetor · 03-18-2008

Are you going to change the springs and valving? The 675 is almost 100 pounds lighter than the thrux.

sweatmachine · 03-18-2008

Quote:

Originally Posted by OKcarburetor

Are you going to change the springs and valving? The 675 is almost 100 pounds lighter than the thrux.

good point, when I swapped the sv650 forks on my bonnie they were already set up by traxxion dynamics for the sv and the 150lb rider that owned it. I put them on my bike, which weighs a good 75-100lbs more than the sv650, and with my 250lb's on it the forks felt like jello. I could grab a handful of brake at 5mph and bottom them out instantly.

A few weeks ago I drained the fork oil and replaced it with 20wt, it made a huge difference, and the ride is now very good and firm (but not too firm).

nickletooth · 03-19-2008

i never thought about that to be honest. but thanks for pointing it out to me .do you think changing the oil would be enough? or should i change the springs also? perhaps i'll wait and see how it feels first.i hope to be able to loose quite a bit off the bike perhaps not quite a 100lbs though.i only weigh 154lbs wet so thats not too much of an issue.
so what do you think, wait or change oil now?
thanks Al.

Phil-1100 · 03-19-2008

I am jealous, I wanted USD forks when I modified my Bonnie, I fitted a Daytona 955i front end on mine, bloody brilliant mate, you will be able to work round problems like springs, speedo drive etc as you progress.

Keep us posted with developments
Phil

Phil-1100 · 03-19-2008

Here's mine

Ha, just found out how to post piccys