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Thread: Honda HRC 450RR

  1. #1
    250rfan's Avatar
    250rfan is offline Sickest custom 450R ever. Arm chair racerJust too addicted
    Join Date
    Mar 2006
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    SCOTLAND - UK
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    474

    Honda HRC 450RR

    I'M GOING TO PUT A 2006 TRX 450eR WITH HRC POWER UP KIT, INTO THIS 85 250r
    ROLLER,,,,,,

    Any suggestions on how to go about it?????,
    Attached Thumbnails Attached Thumbnails 250r Roller.jpg  
    Last edited by 250rfan; 10-21-2007 at 02:21 PM. Reason: change title



    1986 ATC 70
    1985 ATC 250R - Hondaline Special
    1985 ATC 250R - Flat Track 'Privateer'
    1985 ATC 250R - HRC 450RR.
    1986 ATC 250R - HRC Flat Track.
    1998 Honda Laegers TRX 250R (CT 350 PV) N/F cr500 link.
    1998 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    1999 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    2016 Yamaha Laeger's Banshee YFZ 350 (DRI 350) N/F cr500 link.

  2. #2
    3leggeddog's Avatar
    3leggeddog is offline The sun shines on a dogs ass every now and then Got the holeshot
    Join Date
    Nov 2004
    Location
    ohio
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    2,534
    yeap,sell that roller,and use a 350x roller instead.it will makeyour life alot easier
    Full Walsh CRF 450 hybrid 250r

  3. #3
    Join Date
    May 2006
    Location
    Ohio
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    593
    350x engine cradle is alot bigger. Whenever i see swaps that what i see people use. I mean it doesn't look as good as a R..but you could always swap parts i think...

  4. #4
    250rfan's Avatar
    250rfan is offline Sickest custom 450R ever. Arm chair racerJust too addicted
    Join Date
    Mar 2006
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    SCOTLAND - UK
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    Hrc 450 Rr

    Okay guys, here goes, first things first -
    As you can see in the picture, i have removed the original engine mountings, basically so i can see what room i have to play with.

    I know i'll have to lower the bottom part of the frame, to accept the 450 engine, i guess about 2" or so. This will obviously lead to losing some ground clearance, but am not bothered about that.
    Attached Thumbnails Attached Thumbnails 450r 015.jpg   450RR frame mod.jpg  



    1986 ATC 70
    1985 ATC 250R - Hondaline Special
    1985 ATC 250R - Flat Track 'Privateer'
    1985 ATC 250R - HRC 450RR.
    1986 ATC 250R - HRC Flat Track.
    1998 Honda Laegers TRX 250R (CT 350 PV) N/F cr500 link.
    1998 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    1999 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    2016 Yamaha Laeger's Banshee YFZ 350 (DRI 350) N/F cr500 link.

  5. #5
    Join Date
    Jun 2005
    Location
    Jackson MI
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    1,686
    Before you cut anymore on the R frame, measure the height of the carb on the 450r engine. I will never clear the top of the shock. You would have to lower the shock alot to make It fit.



    Last edited by Jason Hall; 10-19-2007 at 07:00 AM.

    83 ATC 60-R Cr60 converted with Zinger parts.
    83 ATC 70.
    83 Tri zinger
    ATC 85-R Cr85 engine on shortened 86-R frame.
    ATC450AF
    86 310-R Drag racer
    440 snowmobile powered custom built.
    87 Cr 500 Converted to Drag racer

  6. #6
    250rfan's Avatar
    250rfan is offline Sickest custom 450R ever. Arm chair racerJust too addicted
    Join Date
    Mar 2006
    Location
    SCOTLAND - UK
    --
    474

    Hrc 450rr

    [QUOTE=Jason Hall;543453]Before you cut anymore on the R frame, measure the height of the carb on the 450r engine. I will never clear the top of the shock. You would have to lower the shock alot to make It fit.

    Okay,
    Thanks for the suggestions guys, firstly am not interested in building this bike using a 350x frame and running gear, it's definitely going to be the 250r the R looks better and handles better than the X , IMHO.

    Thanks, for pointing out the shock issue's Jason, i have done some measuring and yes i will have to lower the top shock mount about 1", but thats because i want to keep the ride height the same as standard 250r, as for the carb - the issue will not be the carb hitting the shock but the carb hitting the upper frame tube, i have two options -

    Option 1 - cut out a piece of the upper frame tube so the carb fits.

    Option 2 - Obtain a shorter carb (aftermarket).

    I should have stated earlier, i am going to use the complete back end of the 450r on this project. So as the 450 rear shock is shorter i will have to lower the shock mount to keep the ride height the same as standard 250r.



    1986 ATC 70
    1985 ATC 250R - Hondaline Special
    1985 ATC 250R - Flat Track 'Privateer'
    1985 ATC 250R - HRC 450RR.
    1986 ATC 250R - HRC Flat Track.
    1998 Honda Laegers TRX 250R (CT 350 PV) N/F cr500 link.
    1998 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    1999 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    2016 Yamaha Laeger's Banshee YFZ 350 (DRI 350) N/F cr500 link.

  7. #7
    250rfan's Avatar
    250rfan is offline Sickest custom 450R ever. Arm chair racerJust too addicted
    Join Date
    Mar 2006
    Location
    SCOTLAND - UK
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    474

    Hrc 450rr

    Okay, here's some pics of the start of the frame alteration, as you can see i have cut the frame in 2 places, i have the rear end and axle on adjustable jacks, so i can keep the frame square and level while modification takes place.


    You can't really see it in these pics but i have heated the 2 front lower frame tubes and used the leverage of the now cut and seperated lower sub frame to bend them causing a gap of 2.125" between the main frame tubes and the rear sub frame tubes. The bending of the front tubes aslo puts them in the correct angle for when i come to cut and splice that area.
    Attached Thumbnails Attached Thumbnails 450r 018.jpg   450r 019.jpg  



    1986 ATC 70
    1985 ATC 250R - Hondaline Special
    1985 ATC 250R - Flat Track 'Privateer'
    1985 ATC 250R - HRC 450RR.
    1986 ATC 250R - HRC Flat Track.
    1998 Honda Laegers TRX 250R (CT 350 PV) N/F cr500 link.
    1998 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    1999 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    2016 Yamaha Laeger's Banshee YFZ 350 (DRI 350) N/F cr500 link.

  8. #8
    250rfan's Avatar
    250rfan is offline Sickest custom 450R ever. Arm chair racerJust too addicted
    Join Date
    Mar 2006
    Location
    SCOTLAND - UK
    --
    474

    Hrc 450rr

    Okay, here are some pics of the frame now lowered, i have inserted pipe inside the frame tubes to give the cut sections a stronger join. Then placed OEM pipe over the inserts, welded then ground to flush, this keeps the frame looking like it was never joined.
    Attached Thumbnails Attached Thumbnails 450r 027.jpg   450r 028.jpg   450r 029.jpg  



    1986 ATC 70
    1985 ATC 250R - Hondaline Special
    1985 ATC 250R - Flat Track 'Privateer'
    1985 ATC 250R - HRC 450RR.
    1986 ATC 250R - HRC Flat Track.
    1998 Honda Laegers TRX 250R (CT 350 PV) N/F cr500 link.
    1998 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    1999 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    2016 Yamaha Laeger's Banshee YFZ 350 (DRI 350) N/F cr500 link.

  9. #9
    Join Date
    Sep 2004
    Location
    springville, PA
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    6,188
    your biggest issue is like stated, carb routing.

    When we did it to brapp's 250r it was misleading because everything lines up (swingarm and sprockets) but in order to fit it with some room we either were going to drop the cradle or give the top frame a trim job and make it like a tri-z. We went with a tri-z method, frame was destroyed beyond repair and now the 450r engine is in a 350x
    Nate

    The Myth, The MAN, The Legend
    R.I.P HRR

    Quote Originally Posted by honda250sx View Post
    Fact: Dr. Death is Bob from Enzyte.

  10. #10
    250rfan's Avatar
    250rfan is offline Sickest custom 450R ever. Arm chair racerJust too addicted
    Join Date
    Mar 2006
    Location
    SCOTLAND - UK
    --
    474

    Hrc 450rr

    Here's some more pics of the frame,

    Pics 1,2,4 show the finished main frame tubes.

    Pic 3 shows the rear sub frame re-strightened with inserts installed ready for the OEM pipe to be overlayed then ground to flush.


    This is the part of the build i've been waiting for - to see how the 450 engine sits inside the 250r frame. I dont need to weld up the front down pipes to check if the engine fits, so i have put on the radiators and one of the radiator hoses in preperation for the engine installation.
    Attached Thumbnails Attached Thumbnails 450R FRAME MODIFICATION 001.jpg   450R FRAME MODIFICATION 002.jpg   450R FRAME MODIFICATION 003.jpg   450R FRAME MODIFICATION 004.jpg  
    Last edited by 250rfan; 03-15-2008 at 09:49 AM.



    1986 ATC 70
    1985 ATC 250R - Hondaline Special
    1985 ATC 250R - Flat Track 'Privateer'
    1985 ATC 250R - HRC 450RR.
    1986 ATC 250R - HRC Flat Track.
    1998 Honda Laegers TRX 250R (CT 350 PV) N/F cr500 link.
    1998 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    1999 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    2016 Yamaha Laeger's Banshee YFZ 350 (DRI 350) N/F cr500 link.

  11. #11
    250rfan's Avatar
    250rfan is offline Sickest custom 450R ever. Arm chair racerJust too addicted
    Join Date
    Mar 2006
    Location
    SCOTLAND - UK
    --
    474

    Hrc 450rr

    your biggest issue is like stated, carb routing.

    When we did it to brapp's 250r it was misleading because everything lines up (swingarm and sprockets) but in order to fit it with some room we either were going to drop the cradle or give the top frame a trim job and make it like a tri-z. We went with a tri-z method, frame was destroyed beyond repair and now the 450r engine is in a 350x

    Ye, i was wondering how you guys were getting on with your 250/450r project.

    So you went down the 350x route, i guess you'll be watching how my project turns out now.



    1986 ATC 70
    1985 ATC 250R - Hondaline Special
    1985 ATC 250R - Flat Track 'Privateer'
    1985 ATC 250R - HRC 450RR.
    1986 ATC 250R - HRC Flat Track.
    1998 Honda Laegers TRX 250R (CT 350 PV) N/F cr500 link.
    1998 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    1999 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    2016 Yamaha Laeger's Banshee YFZ 350 (DRI 350) N/F cr500 link.

  12. #12
    Join Date
    Jan 2007
    Location
    Masshole
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    2,191
    I hope it turns out good for you using the r frame. If it is possible to not destroy the frame in the process, i think you will end up with a much better machine handling and looks.

  13. #13
    Join Date
    Jan 2007
    Location
    Frewsburg NY
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    1,169
    Well I must say you are dong things the right way with making all your welds non visible.

  14. #14
    250rfan's Avatar
    250rfan is offline Sickest custom 450R ever. Arm chair racerJust too addicted
    Join Date
    Mar 2006
    Location
    SCOTLAND - UK
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    474

    Hrc 450rr

    Well, here's the engine in the frame, the TRX 450 rear swingarm and exhaust are also installed .


    The radiators are position'd at the Hrc short coarse kit position ie - 1" back from standard. I was planning on running the HRC short coarse kit on this bike, but after some advise from other board members, i have decided to use the short coarse kit as a second option, i will be running the standard OEM fuel tank.


    So the radiators will sit 1" or so forward than in this picture, the 450 swinger is on with no altering to the frame needed for the main Swingarm/pivot bolt to be installed.

    However, there is some alterations to be made before fitting the lower shock linkage to the frame, and also to fit the top of rear shock to the frame.
    Attached Thumbnails Attached Thumbnails 450R FRAME MODIFICATION 005.jpg  



    1986 ATC 70
    1985 ATC 250R - Hondaline Special
    1985 ATC 250R - Flat Track 'Privateer'
    1985 ATC 250R - HRC 450RR.
    1986 ATC 250R - HRC Flat Track.
    1998 Honda Laegers TRX 250R (CT 350 PV) N/F cr500 link.
    1998 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    1999 Honda Laegers TRX 250R (Sparks 330) N/F cr500 link.
    2016 Yamaha Laeger's Banshee YFZ 350 (DRI 350) N/F cr500 link.

  15. #15
    Join Date
    Jun 2005
    Location
    Jackson MI
    --
    1,686
    Well, looks like your makin It fit. Looks ((SWEET)), did you test fit the tank? Does It clear the engine? The only thing I personally would'nt want is the loss of ground clearance. Other than that It looks like It belong's their. It's pretty amazing what you can do when you are determined. You said you wanted It In the R frame & your doing It. You are obviously very handy and also determined, Nice Work. I wonder if you could use an older valve cover to gain some space on the top. The older engines did'nt have the big square breather on the top.

    83 ATC 60-R Cr60 converted with Zinger parts.
    83 ATC 70.
    83 Tri zinger
    ATC 85-R Cr85 engine on shortened 86-R frame.
    ATC450AF
    86 310-R Drag racer
    440 snowmobile powered custom built.
    87 Cr 500 Converted to Drag racer

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