Author Topic: Exhaust Studs (Read 36381 times)

Dead Eye · « **on:** 24 January 2013, 04:53:40 pm »

Hi all, what size are the exhaust studs? I can't for the life of me remember and I don't have a paper copy of the haynes (digital copy doesn't say). I'm fairly sure they are M10 but wanted to confirm before purchasing

GrahamB · « **Reply #1 on:** 24 January 2013, 05:04:39 pm »

Don't own a 600 but certain that all the Yamaha's I have ever owned have had M6 studs both ends or M6 one end & M8 at t'other. M10 seem huge for exhaust stud to me?

darrsi · « **Reply #2 on:** 24 January 2013, 05:08:24 pm »

http://www.ebay.co.uk/itm/Yamaha-FZS600-Fazer-Exhaust-Studs-Nuts-Pair-/150603687481?_trksid=p5197.m1992&_trkparms=aid%3D111000%26algo%3DREC.CURRENT%26ao%3D1%26asc%3D14%26meid%3D5104949684330945242%26pid%3D100015%26prg%3D1006%26rk%3D1%26sd%3D150603687481%26

ade the blade · « **Reply #3 on:** 24 January 2013, 05:11:31 pm »

m6 and torqued to 10 Nm

red98 · « **Reply #4 on:** 24 January 2013, 05:24:10 pm »

m6........10mm would be the size of the nut o/d or spanner/socket size

Dead Eye · « **Reply #5 on:** 24 January 2013, 06:47:04 pm »

You see, I knew 10 came in somewhere

gordon · « **Reply #6 on:** 25 January 2013, 09:39:34 am »

hi i,v got 92 nuts here in stanless steel if u message me i,ll post some down to you or go to screw fix a bag of 100 will cost you no more than £5

Dead Eye · « **Reply #7 on:** 25 January 2013, 10:46:35 am »

Thanks for the offer gordon, very generous of you, but my eagerness took over last night and I already have some on order. They were only about £3 or £4 so not too much to worry about

bozboz · « **Reply #8 on:** 25 January 2013, 08:29:00 pm »

Incase this helps anyone. I recently changed my rotten studs using 8 stainless hex bolts. I just dremeled off the ends, the size I used was M6x35. Standard exhaust studs measure M6x30ish, the extra 5mm really helps when putting the headers back on, just make sure the thread is good both ends before putting them in the head.

Dead Eye · « **Reply #9 on:** 30 January 2013, 12:01:48 pm »

Right, instead of opening a new topic on basically the same issue, I've managed to snap off the nuts on 6 of the 8 studs. The ones that snapped required so little effort compared to the two that behaved that I just had no chance of not snapping them really - they appear to be the originals and the bike has 84k on the clock so...

I popped out to B&Q this morning and bought some M6 nuts at the advice of red98 (damn delivery hasn't turned up for some others I ordered) and attempted the whole tighten two of them together to be able to remove the stud. No such luck, the stud is stuck fast and the nuts are just grinding away their thread (the stud seems less affected thankfully).

My only choice now is going to be to drill them out, right? Does anyone have any other advice... or a drill with decent bits? I'm otherwise rather buggered. I can pay in beer tokens

red98 · « **Reply #10 on:** 30 January 2013, 12:10:51 pm »

morning deadeye.......just read bozbozs post regarding the use of 6mm bolts.are you sure you have ordered the right studs as looks like he did the job with 6mm......with 6 broken studs it might be easier to remove the engine to do the job

.......have you tryed a stud extractor ?

Dead Eye · « **Reply #11 on:** 30 January 2013, 12:15:56 pm »

The studs I've ordered are proper replacements, but they won't be here till next week I expect. I was attempting to get the old studs out but they are having none of it

I may be able to do it with the engine still in place (might be fiddly) as the only thing that appears to be significantly in the way is the radiator. If it comes down to it, I'll just have to remove the engine which will be a whole lot of fun I imagine - can't be worse than a cage gearbox swap surely...

I haven't actually looked at any stud extractors (didn't cross my mind) so I guess that's my next move.

red98 · « **Reply #12 on:** 30 January 2013, 01:08:08 pm »

these extractors are bulky tools ,you might not have enough room

Dead Eye · « **Reply #13 on:** 30 January 2013, 02:11:55 pm »

Well it was going well... managed to go buy myself a stud extractor set, first one came out easy, next one snapped off with only 1 or 2 mm of the stud left outside of the head

red98 · « **Reply #14 on:** 30 January 2013, 02:27:29 pm »

your not having a lot of luck there matey

...another option for you...the studs that have broken off close to the surface cound be removed with an "easy out" its like a tapered, left handed screw.drill a small pilot hole and wind the "easy out" in anticlockwise,when it tightens all being well it will unscrew the stud and not damage the threads in the cylinder head

Dead Eye · « **Reply #15 on:** 30 January 2013, 02:49:00 pm »

Yeah, I've seen some sets like that as well, but the cheap ones are crap and the good ones are bloody expensive

Oh and me, luck, since when? This is news to me...

GrahamB · « **Reply #16 on:** 30 January 2013, 03:15:01 pm »

You might have to take engine out but have you tried welding a nut to the remaining piece of exhaust stud? Failing this it's drill out job but you need to be very accurate with drill centre. Feel for you. Just had to remove my old FZ750 engine to have 1 lousy stud drilled out.

Dead Eye · « **Reply #17 on:** 30 January 2013, 05:23:24 pm »

I don't have that sort of kit I'm afraid - even before the garage fire I didn't have a welder and the drill I had has been totalled

Looks like I have two Fazers that are busted, bloody typical. Time to try and remove the engine I guess, anyone fancy lending a hand? :P

His Dudeness · « **Reply #18 on:** 30 January 2013, 05:58:53 pm »

ring around a few local welding companies and see if you can get a price for someone to come out to you and remove them.

Ton13 · « **Reply #19 on:** 30 January 2013, 08:26:32 pm »

excuse my stupidness...
are these the bolts that hold the downpipes to the engine?
dont know what mine look like as they are just RUST $:\$

darrsi · « **Reply #20 on:** 30 January 2013, 08:38:05 pm »

Yup, that'll be them....

Dead Eye · « **Reply #21 on:** 30 January 2013, 10:59:51 pm »

Yeah, the damn things are prone to snapping and rusting quite a lot if they aren't looked after. Unfortunately this is exactly my issue.

The old pipes need to be welded quite a bit to be able to pass an M.O.T. regardless and I doubt they would have been suitable for this (metal is too thin now) so they had to come off sooner or later and with the state of the nuts and studs its no surprise they snapped, its just a pain in the ass. The first two came out without too much of a fight, but the subsequent 6 required probably half the amount of torque and just snapped clean off. I guess the metal had just been fatigued too much.

I'm trying what I can to get the bike fixed as fast as possible, but I have no undercover work space (since the garage hasn't been rebuilt yet) and the weather plus a heavy work load is not helping either. If I get extremely lucky and my boss decides that he loves me (not in that way you dirty foccers

) then I may be able to start, and potentially complete, the engine removal tomorrow / Friday. Then I just need to get the old studs out and get the engine back in...

kebab19 · « **Reply #22 on:** 31 January 2013, 11:30:58 am »

You could get maybe another decent cylinder head off ebay to keep the time spent off road to a minimum?

Stud removal can be a real boll1x. With 3 studs snapped off, I had to take one of my heads to a local engineering shop - I dunno what process they used but got 'em out in a day(!) Don't think I'd have ever got them out myself without ruining the head.

Dead Eye · « **Reply #23 on:** 31 January 2013, 01:23:27 pm »

Well my bike isn't my main form of transport thankfully and I work from home, plus the supermarkets delivery so I should be ok with it off the road

I've begun work today in removing the engine and I've just finished getting the carbs out, so time to move on to the next step. If I'm lucky I might be able to finish getting the engine out today, get it to a machine shop tomorrow then reassemble on Saturday? Granted that is quite an optimistic time frame :P

Dead Eye · « **Reply #24 on:** 31 January 2013, 04:53:36 pm »

Right, I am at the stage of removing the engine but im stuck

Can anyone tell me what size this nut is. It is behind the oil filter at the front of the engine - I've removed the filter already obviously but the stud is hitting the frame just enough to prevent the engine from coming out.