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Thread: CBR TF125 Bucket Racer

  1. #1
    Join Date
    15th August 2011 - 12:25
    Bike
    2000 Honda VFR800
    Location
    New Plymouth
    Posts
    5

    CBR TF125 Bucket Racer

    Hi all,

    I've been working on this little project for quite a while now.
    I had been looking for something as a bit of a bucket racer project for a while when my brother ended up with an MC19 CBR250 that he was parting out.
    So I snapped up the rolling frame and then managed to stumble across a cheap TF125 so the project was away.

    This is when the pallet arrived with all the bits.
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  2. #2
    Join Date
    18th May 2007 - 20:23
    Bike
    RG50 and 76 Suzuki GP125 Buckets
    Location
    Auckland
    Posts
    9,792
    .
    Looks Great. ..... Should make a super Bucket. If you want to try your hand at two stroke tuning go here:- https://www.kiwibiker.co.nz/forums/s...tuner/page2000


  3. #3
    Join Date
    25th March 2004 - 17:22
    Bike
    RZ496/Street Triple R/GasGas/ etc etc
    Location
    Wellington. . ok the hutt
    Posts
    16,767
    I've got a thread on TF build as well. If it ever gets finished. Largely just the wiring to finish that I left to the owner. . . Who is electrician. . . We'll he did get the pipe on last week.

    https://www.kiwibiker.co.nz/forums/s...-s-TF125-build
    I've been told. Dreaming`s free.
    Think I'll go, back to sleep.
    Everybody listen, voices in my head
    Everybody listen, do yours say, what mine says?

  4. #4
    Join Date
    15th August 2011 - 12:25
    Bike
    2000 Honda VFR800
    Location
    New Plymouth
    Posts
    5
    I've read your thread, looks like a hot little motor! Can't wait to start into that level of development on mine.

    I keep meaning to update this but I'm not very good at adding the photos.

    I've had mine on track now for a couple of months.
    Initially I just got it going as a completely standard TF. I got lucky that the standard rear sprocket on the CBR and the TF front sprocket seems to be pretty spot on for our Taranaki track and current power levels.

    I chopped up the standard TF pipe and made it fit just to get it running, did a couple of club days like that but it was so choked up by the pipe. Then my brother brought a box of parts for a TF185 that he has in another bike and it came with a frankenstein chamber from a CR80. Its huuuge compared to the standard TF one, I made it fir hoping for a quick and easy gain as I'm not in a position to build a proper tuned pipe yet. It pulls brilliantly out of the turns now but won't rev very far.

    Currently I get absolutely creamed by the FXR's in a straight line...

    I ran the bike at Edgecumbe and managed to fit mid field B-Grade which I was stoked with. The track really suited the bike as its very quick in the turns. I couldn't pass very easy as the other bikes would get a gap at the end of all the straights, but once I got through I could hold my position very well.

    I've just added a flat slide carb so I'm hoping to get out to the track for a tuning attempt tomorrow.
    Hopefully I'll learn a thing or two, I don't know anything about squish bands or timing curves at this point so I am just going to start rich and keep an eye on plug colour and head temp. I've brought an old Alfano kart computer to watch the head temp, hopefully I won't kill it!

    Currently saving for an ignitech and working on getting my workshop organised. Then I'll get into building a spare engine I have and start playing around with some machining. Might have to read some books...

  5. #5
    Join Date
    15th August 2011 - 12:25
    Bike
    2000 Honda VFR800
    Location
    New Plymouth
    Posts
    5
    Pic from edgecumbe
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  6. #6
    Join Date
    25th March 2004 - 17:22
    Bike
    RZ496/Street Triple R/GasGas/ etc etc
    Location
    Wellington. . ok the hutt
    Posts
    16,767
    Cool. Yeah buy a degree wheel and measure the port timings. They are stupidly stupidly low on exhaust timing especially. Can't see how they would rev much past 7000,rpm, maybe 6.
    I've been told. Dreaming`s free.
    Think I'll go, back to sleep.
    Everybody listen, voices in my head
    Everybody listen, do yours say, what mine says?

  7. #7
    Join Date
    12th February 2004 - 10:29
    Bike
    bucket FZR/MB100
    Location
    Henderson, Waitakere
    Posts
    3,761
    Same with the piston port. All designed for the cow cocky to tootle around the farm. I went 200' exhaust and piston port on my TS100 and it was sweet. I'd go for a bit less now. I also devconned over the reed valve hole to clean up the intake port. The reed valve is purely to give a bit of overrev beyond what the piston port is tuned for(my theory). If the piston port is tuned properly you don't need the reed. I had a generic design Wobbly pipe on it which was pretty good.
    You need a pipe and a MX ignition, or better. As Dave said, measure everything. It might take a whole weekend. Compression is good but only with the right ignition, and get the squish nice and tight.
    It'll drive you crazy doing it but the "zing" is well worth it once sorted.

  8. #8
    Join Date
    12th February 2004 - 10:29
    Bike
    bucket FZR/MB100
    Location
    Henderson, Waitakere
    Posts
    3,761
    Once you get it revving, 10-11,000rpm sort of thing you'll find it vibrates real bad. Like breaking bits off the chassis bad. Again it has been made to be sweet for the farmer. All you need to do to fix it is press a slug of aluminium into one of the holes in each crank wheel. There are 2 holes in each wheel, one in front and one behind the big end pin. Actually the 125 might not like going that high but it might be worth considering the balance if you find it does vibe.

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