staffy
Junior Member
Posts: 92
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Post by staffy on Dec 25, 2006 21:24:43 GMT -5
I have that problem with the exhaust flange bolt that is missing (and mutilated). I was thinking of changing the head over when the gasket went, well, the time is nigh. I am getting a bit annoyed of having specks of oil land on my left boot and my front guard which tells me my head gasket is on it's way out.
My options as i see it are this:
Good second hand head,
Rebuild a second hand to new cond (in a similar fashion as hopwheels has done),
Rebuilt performance or stock head,
Aftermarket job. (Someone's mentioned Daytona?)
As far as i can tell the bikes basically stock so i think the standard job might be the go. Agree/disagree? I did try and check the main jet cause i had a feeling someone's re-jetted it but i couldn't get the float bowl off!!!
Whatever i go for i'm now going to have the opportunity to put a new exhaust on the bike and get rid of the rubbish, 3 piece, baffleless hack job that someone put on it! (Any good Australian sources for exhausts would be handy)
So. . . . . . . who is worth talking to/emailing. I've tried deus but they haven't replied to my emails or phone calls (must be busy??!). Who's this daytona mob?
The bike's done 53'000km's. Could i get away with doing just the head and cam box or will it be necessary to look further into the cylinder barrel as well? (how long till rings are questionable?) Are all head/camboxes interchangeable through the model series? Ie: i have a 2/78 complianced bike with a 2J2 serial prefix, will an 80,81,82,etc fit and work? I've read a bit about some improvements in the later heads on this forum.
By the way, i'm in adelaide, if anyone has a matched head/cambox for sale, i'm interested!
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Post by StewRoss on Dec 26, 2006 1:11:06 GMT -5
Hi, Should be a few heads lying around the wreckers in Adelaide...try Japanese Dismantlers for a start (Churchill Rd???)...doesn't matter which year SR you choose. The latest ones have a fresh air port to reduce pollution, with a line bolted just below the exhaust port. These openings can be easily capped off with 6mm bolts and a small blanking plate. The TT/XT heads have a smaller inlet valve and less finning... There are plenty of other wreckers who could provide you with a SR head around Aus as well... Once the head is off the bike an engineering place should be able to drill the old stud out on a mill and replace it. At that mileage it'd possibly be good to replace the rings and hone the cylinder as well. New camchain as well. Have someone measure up the bore and see if an oversize piston is worth pursuing...Pitman's would do that for you if you don't want to do it yourself. My experience has also shown that it's better to get yourself a genuine gasket set and valve stem seals...the later model base gaskets are sandwiched metal and are much better...perhaps try Vanem or Deus... The Daytona heads are marvellous things but they are meant for fairly large diameter carbs....they're also about $2,500...or more... Sjef can fill you in on the details... You can possibly get an exhaust from Rod Tingate...they work well but you may have to wait though...(03) 9722 1884. Tell him I sent you... SR  |
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Post by sjef on Dec 26, 2006 4:08:58 GMT -5
hallo if you decide to buy another head at least buy one compleet with the the rockerbox, because this is a match with the clinderheadbase.when you buy a head with rockers and cam buy one from 84 or later because then the surface of the cam and rockers are hardened(less wearing). is there no way to get the stud out? if you are satisfied with the bikes performance stick to stock, if not there are plenty ways to increase power. depending on skill and money you have. The Daytona head is excellent but imho not without further action on the cylinderarea. its ment to suck in large volumes of air/fuel. about the 53000 km it is worth to check everything good. then again if all is fine and you are happy with the bike, why spend extra dollars? rings should last about 100.000km here in europe there are several sr with 100.000kmplus with the original engine.on the other hand if some parts are worn, why not invest the money for repair in some extra power? try www.vanem.com.au for daytonaparts. have ordered stuff there, good to do business with. regards sjef |
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Post by fenz on Dec 26, 2006 4:10:13 GMT -5
Hey Staffy
Let me know if you are going to replace the head as i might be interested in your old one.
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staffy
Junior Member
Posts: 92
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Post by staffy on Dec 26, 2006 21:25:13 GMT -5
Hey Staffy Let me know if you are going to replace the head as i might be interested in your old one. Maybe we could work out an exchange deal? I've posted some pics of the problem bolt before: sr500forum.proboards38.com/index.cgi?board=Exaust&action=display&thread=1165648482The problem is i'd rather have the parts fixed, reconditioned and assembled, ready to go on and replace the old gear. This in effect means i'd be looking for a cylinder, head and rockerbox to prepare ready to go on. It's kind of important as very soon it'll be my ONLY transport when i can't wrangle the car off the missus. The Daytona stuff is probably not for me for now. I'm pretty happy with the stockish bike. I felt that i should probably sort the rings, i just don't want to go much lower than that for now. Is it enough to hone, fit new rings and hope the gap is good or is it worth boring and going for oversize? Sjef mentioned post '84 model heads as an option. Does anyone if they're around in Aus. I thought the SR stopped coming over here in '82. There's heaps of threads on this site with some good info but i haven't seen any recommendations for South Australian cylinder head or machine shops. Anyone got a good one? Even better. . . . . Does anyone live in adelaide that can pop round for a look over a couple of beers and talk me through the whole thing??!! It's a fair step from doing cylinder head welch plugs and rockers on a commodore!! |
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Post by StewRoss on Dec 27, 2006 2:49:09 GMT -5
Hi, I don't personally know anyone there anymore to assist...I do know guys there who are geniuses but they don't do outside work anymore... For a standard rebuild it is fairly simple and any decent head place should be able to reseat the valves and hone the cylinder...try for a performance place, they are used to taking a bit more care. HRE are at Aldgate... Hanlon Race Engineering PO Box 223 Aldgate SA 5154 ph: 0407 400 074 Motor Cycles, Parts & Accessories--Retail Try also Hoey at Pooraka... Hoey Racing Motor Cycle Engineering Unit 3, 111 Research Rd Pooraka SA 5095 ph: (08) 8262 3600 Motor Cycles, Parts & Accessories--Retail Hanlon flow-ported the head for my Honda twin racer and did a really great job. The bike flies as well so they know what they're doing. For ease of mind go to Pitmans and have the bore checked for wear...they're used to doing this if you can't do it yourself and it shouldn't be onerous for them. They'll probably do it for free. Buy a new cam chain, top end gasket set and guide seals...being Yamaha you'll probably have to buy them separately, depending on the valve wear they may have to be replaced. Valves that are cut after they're worn can sometimes almost go knife edge on the head...bad for burning out the valve faces. Try HRE for having the valves recut as well (or Pitmans). Some car places can cut them to the wrong angle and this can wreck a good valve prematurely.  These bikes are very simple and relatively easy to work on...give it a go. SR  |
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staffy
Junior Member
Posts: 92
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Post by staffy on Dec 27, 2006 19:24:46 GMT -5
Cheers stew, exactly what i needed. I'll be definately calling those places. I was gonna go for new valves, chain, the lot. If i've got the thing pulled down it'd be a bit of a waste to do it half arsed.
I've had a few quotes from wreckers, one said $250 minus cam, rockers, etc and another quoted $300-400 complete (aussie dollars). Does this sound reasonable?
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Post by yamatopdog on Dec 27, 2006 20:30:05 GMT -5
Stew +Sjef,a little info on part # on later models?US manuals cut us off early
Stew if you could supply a part # for the base gasket,have a fresh top end but the base gskt is starting to leak.(although now that i know that i like the bike i may bump the compression a little or possabley a 540 kit)Sjef if you could do the same w/the rocker #s,i installed a megacycle cam during my rebuild and they sugested replacment rockers,but w no expanation,so w/such a low mile bike i did'nt replace them,athou since i a'm going in again i will.
Staffy, try ebay(i'm sure you have,but go international) i picked up a bare head w/matching cam box for $16us shipped
thanks to all!
Happy new year!
Bob
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Post by StewRoss on Dec 27, 2006 20:50:08 GMT -5
Hi, I have just looked at the gasket but there is no number on it. The later SR400 ones are 3HT-11351-00 (2003?), but I am not sure if these are the same as the one that I have here or not. This one has the paper either side of a metal centre. I am expecting a call from the guy who sold me this stuff later today so I will ask him then. He also sold me the later model rockers that have hardened inserts and the later model exhaust valve as well. All worth having for longevity. The exhaust valve has 5A8 on the face of the head and not 2J2 (583?). Megacycle usually won't warranty their cams if you don't use new or reconditioned rockers... SR |
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Post by StewRoss on Dec 27, 2006 20:51:33 GMT -5
Hi, Ah well it depends how much you want it...heh, heh...the prices often vary with the need. There are some wreckers in Sydney who bring late model ones in for wrecking as well. The last one to come to Aus (and the US and possibly the UK as well) was the H model ('81)...they would still have had them on the floor in '82 as well. A mate of mine bought a new one from Pitmans in '82. He got them to fit an E model tank before he picked it up. SR |
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Post by yamatopdog on Dec 27, 2006 21:12:05 GMT -5
thanks Stew, much thanks if you can supply the #s. i would'nt recommend using 400cc head gskets,had a 1200cc sportster w/1100 head gskets in the shop once,made a very cool sound!
Bob
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staffy
Junior Member
Posts: 92
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Post by staffy on Dec 27, 2006 21:56:44 GMT -5
Those part numbers would be very handy. Especially if they're for parts that are a major improvement on the originals. I hate leaky gaskets!! |
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Post by StewRoss on Dec 28, 2006 0:22:37 GMT -5
Hi, Shouldn't be a problem using the 400 gaskets as the bore of the 400 and 500 is exactly the same. Yamaha simply shortened the rod stroke to 62mm (...as I recall)... They even use the same barrel I understand. There should be heaps of more recent SR500 stuff around the place in any case. They kept making the 500 for many years after they ceased importing them to the US and Aus... SR |
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Post by sjef on Dec 28, 2006 18:44:05 GMT -5
hallo yamatopdog, cannnot help you with the rockerarmsnr,only have partsmanuals for 2j4. bought my rockers together with a megacyclecam and bearings as a kit from daytona few years ago.  regards sjef |
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Post by yamatopdog on Dec 28, 2006 20:15:16 GMT -5
Stew. thanks for the gskt #,will pass it on to my yamaha guy.Sjef are the rockers picured later yamaha pieces or an outside supplyer? thanks again,Bob
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