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Which Can???

Discussion in 'Maintenance' started by stubbsy, Aug 20, 2013.

  1. stubbsy

    stubbsy Member

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    Just a quick few questions on mufflers/slip ons.

    Which mufflers are louder short or long mufflers?

    does engine make a difference in choice of muffler (ie 250cc only 4 cylinder /vtwin/ parallel twin or thumpers )?

    Would you consider drilling holes/debaffling stock exhaust?

    Thanks
     
  2. risky

    risky risky

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    you can have a straight through pipe as long as you like and it will be loud. mufflers have baffles to deaden the sound otherwise it says'' officer sir, i am richard cranium and please book me.''bikes attract enuff attention so quietness with performance says ;i am a good little boy and not harassing the neighbourhood. must be that loud bike that went past me.''
     
  3. Phil

    Phil Senior Member Contributing Member

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    Hey Stubbsy
    What are you chasing??? noise, performance, looks. Bigger is not necessarily better nor louder, the internals dictate that. It matters not which engine you have. Considering the classic that is your bike, I wouldn't destroy your original cans, fit something else and preserve what you have. One day you may wish to completely re-store what you have, you'll thank me for hanging on to the original cans.
     
  4. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  5. stubbsy

    stubbsy Member

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    thanks for the replies i might take your advice phil and keep the mufflers when i put slip ons on. So i can go back stock if i wish.
     
  6. risky

    risky risky

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    top idea. avoid too much noise.... i remember a richard in west wyalong in the 70,s who had a loud bike. the local sergent gave him a lot of fines and suggested helive in sydney but allowed back one weekend every 6 weeks. said richard did not take advice so collected more blueys to pay plus court costs and in the end became a very quiet boy.
     
  7. Phil

    Phil Senior Member Contributing Member

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    Wise move my friend, because your bike is a little rare, hanging onto the original mufflers is a smart move.:thumb_ups:
     
  8. stubbsy

    stubbsy Member

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    Just curious with getting my slip ons how long can I wait before i have to rejet the carb?
    Will running it for a few weeks without the rejet kill the engine?

    Thanks
     
  9. risky

    risky risky

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    read the exhaust and plugs. will depend on scavenging effect. if toooooooo lean will melt pistons, tooooo rich will foul plugs. heat range on plugs may also need looking at.blistered plugs are a no no. hope this helps. the pipes may not change anything except sound frequency. look at the pipe end after first ride... black means rich and white means lean. see if new cans show different colour to the old ones.
     
  10. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    IMHO of course!
    Back in the old days, when men were men and dynos were scarce, this was my chosen method for selecting main jet size. Keep going smaller until it starts to miss on a wide open throttle. Use one gear lower than top so the engine can pull it without too much effort. I used to use this method at the track and I could hear that distinct note as my rider tried to pull peak revs. It is almost like a misfire. Then go back up one size on the main jet and Robert is your mother's brother. It will be a rocket!
    Reading spark plugs is a bit of a grey art and definitely one of the most wrongly interpreted subjects known to man. I always used new or very close to new plugs and a magnifying glass and light to inspect that little tan ring at the base of the porcelain. You need to go through the plug chop routine and then follow the attached image as a guide.

    Now on the internet and elsewhere you will find a lot of old wives tales along with pics of spark plugs taken from Austin A40s and such. The "here is a spark plug from an Austin A40 that has burnt 85 gallons of oil and it is black and wet" type of thing, but we aren't really concerned with them. Our focus is more on high performance motorcycle engines.


    how to read spark plugs.jpg
     
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    Last edited: Aug 28, 2013
  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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  12. stubbsy

    stubbsy Member

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    Cheers guys great info very helpful.
     
  13. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    That is a good guide to reading plugs. All helps to know what the insides are doing.
     
  14. zixxer

    zixxer Well-Known Member

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    i put a shorty ebay can on mine and it does sound good but does seem to run richer and performance is not as great as the stock can.
     
  15. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    The shorty can may be working more efficiently and therefore requires leaner jetting.
     
  16. zixxer

    zixxer Well-Known Member

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    that is possible aswell, it has basically no restriction in the can compared to the stock can where its a maze of baffles inside. I plan to change to a longer can soon anyway as the shorty is much to loud.
     

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