Exhaust Exhaust Pipe problems

Discussion in '2-Stroke Engines' started by Canon, Feb 9, 2010.

  1. Canon

    Canon New Member

    I was tightening a loose nut on one of the two engine bolts that holds down the exhaust pipe when one sheared off because I tightened it too much. Any ideas on what to do? I have a feeling that removing the exhaust pipe completely is a bad idea hence the existence of the exhaust pipe, but I dont know what else to do.

  2. You will need to buy a bolt extractor to extract the sheared bolt and then u will have to replace the bolt.
  3. AussieSteve

    AussieSteve Active Member

    As CabinFever1977 said, buy a set of bolt extractors, 'Ezy-Out' or similar. They have a tapered shaft made of hardened steel, with a LHS, (reverse) thread and a sever pitch.
    The idea is to drill a hole down the centre of the broken bolt, (to the size recommended for that size ezy-out), then screw the ezy-out anticlockwise until it bites and then you can unscrew the broken stud to replace it.
    Good luck.

    ... Steve
  4. mattman

    mattman New Member

    Running the engine without the exhaust hooked up will burn it up eventually.

    A few tips if you decide to use an ez-out/screw extractor:

    They are usually considered a 'last- ditch' effort. Try other ways to extract the bolt first.

    Drill the pilot hole perfectly straight. Ding the center of the bolt with a punch to keep the bit from walking, Start with a small bit and go larger.

    Ez-outs and screw extractors are notoriously brittle. Very hard metal, like carbide and nearly impossible to drill out. You don't want to break one off.

    Heating/cooling cycles have probably frozen the stud in tight, so you will probably have to heat the area around the threads to loosen it up some.

    That's all i got, sorry to hear that happened. Good Luck!
  5. AussieSteve

    AussieSteve Active Member

    Generally, there's no drama removing these studs if you take it easy. No need for a torch - they (usually) don't bind very hard.
    As mattman said, if there's any stud protruding, try other methods first.
    Otherwise, drill the hole and try the ezy-out, but not with excessive pressure. Be sensible and you won't break the ezy-out.
    My bet is that it will come straight out.
    Then, if that fails, use heat. (To remove a very tight end cap on my bottom bracket without damaging the paint, I found that a hair dryer can do the job. I was at my wits end after 2 days but didn't want to re-paint. Worked like a charm.) Worth a shot if you're stuck and don't have a torch.

    ... Steve
  6. Al.Fisherman

    Al.Fisherman Active Member

    If drilling is needed, consider the first hole small and the second use a left hand drill bit.

    Steve...Question? In the land downunder is the term normally "anticlockwise" or counter clockwise, used....just wondering?
  7. AussieSteve

    AussieSteve Active Member

    Hi Ron.
    Are left-hand drill bits very common? I've never seen one.

    I think it's about 50/50 between anti- and counter-
    Depends on which school you went to.

    ... Steve
  8. Pablo

    Pablo Motored Bikes Sponsor

    I second the left hand drill bit - most all well stocked tool places have them. I do believe even Sears has them. Sometimes they are in a kit with various sizes and some lousy extractors. I can't imagine the stud being all that tight in the hole though.
  9. AussieSteve

    AussieSteve Active Member

    We live and learn. A number of times, (not on these engines), with a RH drill bit I've made things worse while drilling by screwing the stud further in.

    P.S. Paul, the shift kit is great. Had a few rides now. Just need to get my engine running better, then play with gearings. Even as it is, though, I couldn't imagine going back to no gears. Today I almost idled down the road at my old top speed. And in my gravel driveway, I won't be falling off any more from too tall a gearing.
    I'll write more in a few days, after tuning and more testing.

    ... Steve
  10. Al.Fisherman

    Al.Fisherman Active Member

    Steve, although common you need to ask for them. Along with tool suppliers that carry them you can get them on E-Bay. I'd venture to say that when a bolt breaks in these engines that didn't have lock tite on it the LHD will thread most of them out.

    http://shop.ebay.com/items/left hand drill bits?_dmd=1&_sop=12
  11. tom80

    tom80 New Member

    I like the square easy outs myself. Once you tap them in you can turn left or right to help work bolt loose.
  12. AussieSteve

    AussieSteve Active Member

    Checked out your link, Ron, 64 sellers on eBay US. Out of interest, I did the 'left hand drill bits' search on eBay Australia - 1 result - a set of 3 drill bits.
    Our local hardware has never heard of them either.

    It seems that in some fields, we're missing out quite a bit here. Too small a population at a mere 2x million. 22-24 now, I think
    Our TV's were always third-world type models, intended for Czechoslavakia, Poland, Romania etc. No hue and tint controls, etc, etc. A lot of the CRT TV circuit boards that the US saw had only about 3/4 of the components mounted, when for sale in OZ.
    Nothing much has changed.
    Back to LH drill bits, when I need them, I'll order from the US or Asia, not here.
    (I'm pretty sad to have to say these things, too.)