Page 8 of 14 FirstFirst ... 678910 ... LastLast
Results 106 to 120 of 200

Thread: 2010 weapon

  1. #106
    Join Date
    4th August 2007 - 17:55
    Bike
    NSR300 F3, ME BUCKET
    Location
    Wellington
    Posts
    2,656
    Quote Originally Posted by SS90 View Post
    Ok, what you have is called "open loop" (basically, this is an older system that does not use an o2 sensor to calculate, and adjust fueling, it relies on a predetermined fuel curve)

    It's simply a cheaper system.

    take your header in to the muffler shop, and simply get them to cut the cat out, and replace it with a straight bit if tube (inexpensive really).

    I guarantee you you will gain power, and won't have problems with fueling.

    It's been done before.

    If you make the header 660mm long from the valve then into a good muffler that should work nice at 10000 rpm if it makes its power in another rev range add 50mm to move power down the rev rang (ie 710mm header length = 9500) or shorten it to move it up the rev range (ie 610mm header length = 10500). Header dia I would leave as standard 4 now. Bigger might not be better for you yet. A good header length for an FXR is around the 500 550mm from valve as they make there power at higher revs.

  2. #107
    Join Date
    24th July 2008 - 18:01
    Bike
    Honda RS 125 1992
    Location
    Taupo
    Posts
    717
    Now that is very good advise max read it more than once .

  3. #108
    Join Date
    15th September 2004 - 22:33
    Bike
    Hornet 900
    Location
    Capital town
    Posts
    3,471
    This forum may help with info, it seems to be pretty active.

  4. #109
    Join Date
    17th February 2008 - 17:10
    Bike
    gp125 rg50 rs125hybrid
    Location
    Helensville
    Posts
    2,882
    Blog Entries
    2
    "Instructions are just the manufacturers opinion on how to install it" Tim Taylor of "Tool Time"
    “Saying what we think gives us a wider conversational range than saying what we know.” - Cullen Hightower

  5. #110
    Join Date
    16th November 2009 - 14:57
    Bike
    cbr,streetstocker
    Location
    auck
    Posts
    1,022
    OK, i jsut took to the aroudn the block, it goes great!, at first i thought, this feels un responsive, but after gunning it a few times, the whole engine rev's have changed, now it likes being short shifted {not revved out} and now it pulls away better in 3rd from a standing start {which it couldnt do before}

    Also it's not loud!, as now it almost gets quieter when your riding it, I realy do like the bike like this, as it pulls better and has a much better ommff when you pull back the accelerator.

    There is room for the better exhaust system, but at the moemnt its not my top piority, as the bike is fast enough as it is.

  6. #111
    Join Date
    23rd January 2004 - 12:00
    Bike
    ninja 250
    Location
    Christchurch
    Posts
    5,024
    Quote Originally Posted by richban View Post
    If you make the header 660mm long from the valve then into a good muffler that should work nice at 10000 rpm if it makes its power in another rev range add 50mm to move power down the rev rang (ie 710mm header length = 9500) or shorten it to move it up the rev range (ie 610mm header length = 10500). Header dia I would leave as standard 4 now. Bigger might not be better for you yet. A good header length for an FXR is around the 500 550mm from valve as they make there power at higher revs.
    Do you recommend a standard header diameter size for the FXR as well? Is there any advantage with a larger diameter header pipe?

  7. #112
    Join Date
    16th November 2009 - 14:57
    Bike
    cbr,streetstocker
    Location
    auck
    Posts
    1,022
    My header got made bigger my "customchambers" and he knows what he's doing so i guess it is better to makei t bigger

  8. #113
    Join Date
    4th August 2007 - 17:55
    Bike
    NSR300 F3, ME BUCKET
    Location
    Wellington
    Posts
    2,656
    Quote Originally Posted by gav View Post
    Do you recommend a standard header diameter size for the FXR as well? Is there any advantage with a larger diameter header pipe?
    With my worked engine I have gone up one size and staged it. Its 1" 1/8 for the first 200 then 1" 1/4 for the next 100 and then 1" 1/2 for another 100. Then into me fruity muffler. Its all unproven but the bike is going good. The engine is designed around peak torque being 12000rpm. Max horsepower should be above the limiter somewhere.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	IMG_0152.jpg 
Views:	27 
Size:	71.9 KB 
ID:	192832  

  9. #114
    Join Date
    16th November 2009 - 14:57
    Bike
    cbr,streetstocker
    Location
    auck
    Posts
    1,022
    my bike is running a 1" straight through pipe to a steal muffler with a 2cm opening

    beat that

    did i mention its got usd fork??, hahha serious performance
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	da monsta.jpg 
Views:	25 
Size:	40.6 KB 
ID:	192836  

  10. #115
    Join Date
    23rd January 2004 - 12:00
    Bike
    ninja 250
    Location
    Christchurch
    Posts
    5,024
    Thanks for that, looks very neat!

  11. #116
    Join Date
    23rd January 2004 - 12:00
    Bike
    ninja 250
    Location
    Christchurch
    Posts
    5,024
    Quote Originally Posted by woodyracer View Post
    my bike is running a 1" straight through pipe to a steal muffler with a 2cm opening

    beat that

    did i mention its got usd fork??, hahha serious performance
    You shouldnt steal mufflers Max ....

  12. #117
    Join Date
    16th November 2009 - 14:57
    Bike
    cbr,streetstocker
    Location
    auck
    Posts
    1,022
    Quote Originally Posted by gav View Post
    Thanks for that, looks very neat!
    why thanksyou, i think it turned out good.

  13. #118
    Join Date
    16th November 2009 - 14:57
    Bike
    cbr,streetstocker
    Location
    auck
    Posts
    1,022
    Quote Originally Posted by gav View Post
    You shouldnt steal mufflers Max ....
    i am speaking chinenglish......duh!

  14. #119
    Join Date
    4th August 2007 - 17:55
    Bike
    NSR300 F3, ME BUCKET
    Location
    Wellington
    Posts
    2,656
    Quote Originally Posted by gav View Post
    Do you recommend a standard header diameter size for the FXR as well? Is there any advantage with a larger diameter header pipe?
    Gav. I didn't really answer the question coz the truth be told I don't know. Its one of those how long is a peice of string questions.

  15. #120
    Join Date
    16th November 2009 - 14:57
    Bike
    cbr,streetstocker
    Location
    auck
    Posts
    1,022
    the advantage with a larger header pipe is "back pressure", so basicaly what you want is a pipe sized to accomodate both back pressure for bottom end and a pipe that isnt too fat so you can get top end power. The standard diameter on a fxr is good, but its double wall steal so its better to get a new one made so its lighter. But for kart tracks i find you want bottom end over top end, so a nice big fat header is nice.

    The "bananna" bucket has a huge fat header and a 1" straight through muffler, it may pop wheelies like no other gs125, but its got no top end so you are left for dead on the straights. Its down to "What do you want your bike to do?"

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •