Big problem this time - bike sounds like a sewing machine and no power

[lb99]

head gaskets are usually a one use item , but sometimes you can repeatedly use them, but they crush the first time you torque the head down and dont spring back, your bike doesnt have a rocker cover gasket, although some bikes do.
just make sure the rocker cover and head are clean and smooth on the mating surfaces and maybe use a small amount of some sort of sealant (you dont need to glue it togeather) and you should be sweet

I am trying to get hold of the XR dude, his phone is engaged so at least someones home.

[xwhatsit]

OK, so I'll want a new head gasket then? Unless... I keep the crushed one I already have, because it'll be thinner and increase compression ratio! Muhahaha! No, anything more than about 8hp is too much for me, so I think I'll just get a new head gasket *sigh*.

Thanks for your time lb99! You know my first primary school teacher was from Blenheim, and she was a real cutie (my dad wanted to go to all the parent-teacher interviews haha), so you lot must be All Right lol.

[lb99]

anything more than about 8hp is too much for me, so I think I'll just get a new head gasket *sigh*.

DUDE, you can never have too much horsepower!

You know my first primary school teacher was from Blenheim, .......so you lot must be All Right lol.

uh, yeah except I grew up in Dunedin

[xwhatsit]

DUDE, you can never have too much horsepower!



uh, yeah except I grew up in Dunedin

Neeeehhh... I ride like a super-nana. I ride like a great-great-nana . I should've got a Velocette, like my grandpa had . I bet that would be more reliable than a Honda!

[lb99]

I bet that would be more reliable than a Honda!

Heap
Of
Nasty
Decaying
Alloy

dont worry Hondas outnumber everything else in my garage by 3 to 1

[Ixion]

Air cooled engine, you can usually reuse the head gasket unless it is visbibly damaged. Water or oil cooled is another matter. Check the price, they can be painful.

Sprocket, you should be able to get it with the camshaft , prolly not cost any extra.

The bearings, I'm not familiar with the single cylinder hondas. Only fiche I can find on line appears to be a slightly different engine (how many ruddy 250cc singles DID Honda make anyway!).

It may be a plain bearing with some other fitment, it's hard to tell from a picture. main thing is any plain metal bearing surfaces need to be reasonably free of damage and scoring.

Source a camshaft then sing out , some of us will come round and hold an ernest panchayet over the remains and see what can be done.

EDIT: Yep Velos were pretty reliable. Just bits fell off.

[lb99]

I talked to the guy I know, he says he can do a cam for $30 incl sprocket if he has a good one, so let me know if you want me to get him to look one out.

he reckons that the centre bearing in those heads is not too important, its only there to stop the cam from whipping about, so as long as the two outer ones are ok-ish then you should be ok, but it might be a bit noisy.

I thought I might have had you a whole bike for $75, but it turns out to be a cb125t (twin) so if anyone wants one then pm me for the number

[FROSTY:Me]

dude if it was me--i'd haul the barrel off and have a lil hunt in the bottom end for that bolt --actually even if ya hafta turn it upside down and give it a shake--that there bolt aint gonna be good for ya--ya dont want lockup number 2

[Ixion]

If the bolt went down the cam tunnel odds are its happily sitting at the bottom, in the primary drive case. Just have to take the cover off, need to do that anyway to change the camchain. Unlikely to have migrated into the chaincase itself, with any luck

Definately needs to be recovered, of course.

[xwhatsit]

Thanks all! Yeah, Ixion, I've been looking for a parts fiche for it for ages, but I've got nowt.

Sweet, so I can keep that gasket? It looks pretty good.

Hmm well all three of the bearing surfaces are pretty scored up, not just the centre one. As far as I can tell it's not warped, so that's good. With a new cam shaft I might check how it fits into the head, and if the stiffness in the old cam shaft is not just due to the shaft being bent.

lb99, that's great! Thanks so much for that! $30? That is so much cheaper than I thought. Obviously that comes with those wee little evil bolts too? I don't suppose he has a camchain too, or seeing as they're a wearable part I'd be better off asking Econohonda? Is that a XR250 cam, btw? *Manic grin from more horsepower*

$75 for a CB125T! ! Haha hell yeah I want it! But I can't have it . Stay away from bucket racing until I have my primary means of transport sorted and I can stop catching the bus :sob:.

No, I do plan to hoik that bolt out, I don't imagine I'd be doing the engine any favours by leaving it there. Hopefully I won't have to resort to shaking anything upside down, I doubt my puny forearms would be up to shaking any largish chunk of aluminium with any security .

[xwhatsit]

Wah! Check this out!:

http://www.trademe.co.nz/Trade-Me-Mo...n-78736168.htm

Reckon it's OK? Buy now for $80, who knows, could get it for less! Looks a bit corroded... and the end bearing looks quite different from my CB250RS head, where the tacho drive attaches, but could work? Don't care it's a different colour to the rest of the engine.

What does everybody think?

[xwhatsit]

Ooo yes! And this:
http://www.trademe.co.nz/Trade-Me-Mo...n-78258522.htm
Amazing the stuff you find when you look for mispellings...

See that's a whole bike. Oddly enough it has a knobbly rear tyre. Guy says it turns over but does not fire... does it look in too shit condition to scavenge parts off? Then again it's in Wanganui, wtf.

[lb99]

although that seller is a bit of an old pirate (Hi Terry), I think XRs had no rev counter drive, and just had a bung instead, I'd be a bit suss about that bike for $200 though, although that knobbly looks pretty good, its really rusty, check out the chain and sprockets, unless you need other parts, you could probably fix yours for cheaper.

[xwhatsit]

It won't just plug into the cam? The locking bolt for it is on the valve cover. Will it leak oil?

[lb99]

the rev counter drive should fit ok, is your head really fucked?, you should see if mister Ixion can check it out for you, he seems to be in the same city