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Post by strick on May 31, 2008 22:25:22 GMT -5
I am on the final assembly of my street tracker. I rebuilt the top end with a new overbore high compression piston, new valve and new valve springs, swing arm & steering bearings, etc.
I was attaching the oil lines today (engine in bike) and was about to install my new Thumperstuff oil line when I notice I do not have the metal line that runs from the case (just below the cam chain tensioner) to the intake rocker assembly on the right side. The metal one that runs behind the head and in front of the carb. I bought the bike in not running condition. It had a BADLY stuck exhaust valve. The only oil line that ran from the case below the tensioner was rubber line that ended up at the exhaust rocker.
Question - is that O.K. and 'good enough' or should I order the metal line to use in conjunction with the Thumperstuff line (part # 1102)?
It seems the previous owner did many modifications to the bike: header with supertrapp tuned exhaust, aftermarket shock, K & N filter and now I discoverd the oil line conversion.
As always, thanks guys (mates)!
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Post by malakiblunt on Jun 1, 2008 3:04:03 GMT -5
Hi Strick
i dont no the spacifics of the thumper oil line kit, but the standard bike just has one metal line, to the intake side of the head, ( not the rocker plug) were the modified line, simpley runs to the exhaust rocker plug, the yamaha kit is just a longer metal line, or i have just modified my bike and used a braided brake hose to run from the crankcase up to the exhaust rocker. replaceing the metal line.
Though as the oil system is low pressure i geuss a plain rubber line would be ok, though valunable to damage.
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Post by aero on Jun 1, 2008 4:23:22 GMT -5
I modified my 1979 SR with the oil line from a later bike, The Street tracker I'm building will have a home brewed oil line going directly to the exhaust valve rocker pin. The kit consists of a rear brake line that has been sitting around so long I've forgotten what it fits, a set of aluminium replacement rocker pin end caps that came fitted to a basket case engine and some banjo bolts I made from 10mm stainless steel allen srcews. You can buy a kit for about £20 in the UK and I did wonder if the time it took me to make everything fit together was time well spent? Modified with Yamaha oil line  My attempt  I certainly wouldn't rely on the old standard set up with the oil feed going to the back of the head. Even Yamaha binned that arrangement. I believe feeding the oil direct to the exhaust rocker, combined with the later type rocker arms will prevent early failure of the valve gear. I'm not entirely convinced that the standard oil pump has enough extra capacity to supply oil directly to both inlet and exhaust valves, and on a road engine wouldn't think you'd need to. |
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sven
Full Member
Posts: 166
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Post by sven on Jun 1, 2008 4:50:51 GMT -5
... I did wonder if the time it took me to make everything fit together was time well spent? Surely! Your oilfeed looks very nice! Are the banjo fittings stainless steel or chromed brass? |
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Post by aero on Jun 1, 2008 5:12:09 GMT -5
Everything is stainless, the brake line ends are polished, but the bolt heads I tend to remove the numbers and leave them as machined. Spent ages so far turning bolt heads down and making special bolts. Must get out some more!
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Post by stevec5000 on Jun 1, 2008 7:56:27 GMT -5
If you use rubber hose it has to be able to withstand high temperatures since the head normally runs about 300 deg. F.
I suppose braided brake lines would be fine since they normally have teflon tubing inside.
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Post by malakiblunt on Jun 1, 2008 10:55:42 GMT -5
yes made an oil line like aeros, useing an old brake line, i drilled and threaded the rocker plug for a standard banjo bolt and i built up the crank case banjo bolt with braze then tuned it down to fit the bajo (the yamaha banjos are smaller than standard brake ones) if only i had an oil pump that catualy worked it would be great!!  |
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Post by caferacercarl on Jun 2, 2008 3:38:17 GMT -5
The rubber line you had would have been an aftermarket one, they sold heeps of them here, I use the one Aero so nicely provided a lovely clear picture [ and explanation] of, the oil pump is cheap to rebuild as is accesible under the clutch ,remember to replace the two little oil seals in the pump as well. cheers.
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sven
Full Member
Posts: 166
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Post by sven on Jun 3, 2008 11:38:30 GMT -5
... I'm not entirely convinced that the standard oil pump has enough extra capacity to supply oil directly to both inlet and exhaust valves... No problem! |
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Post by frankyb on Jun 3, 2008 19:36:14 GMT -5
Hi guys, my oil lines came from mark at thumper stuff, and are the two line kit that goes up over therocker cover to both rocker spindles as individual fittings. They are rubber lines with a braided nylon type sleeve, and are as good today as when they were first fitted about two years ago. And yes aero, the standard oil pump seems more than capablein supplying more than enough oil to both valves. This particular bike is raced on the dirt, and as such is probably subject to a lot more abuse than most road bikes, so Iguess maintenance is more intense to compensate. Cheers Franky b.
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Post by StewRoss on Jun 4, 2008 3:05:05 GMT -5
I run both standard Yam oil lines together on my road bike...no worries. Just need a longer banjo bolt, or make one like I have here.  SR  |
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rei97
New Member
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Post by rei97 on Aug 22, 2008 2:27:59 GMT -5
Hi,
never take that 48T line (especially the crome type) without the rubber bushing in the middle, because it will break sooner or later from its Vib response.
Regards
Rei97
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