Valve stem seals
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- TRX-Enthusiast
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Valve stem seals
I am gonna replace the valve stem seals on my TRX to try and improve the oil consumption issue. My question is...are there any special tools I will require, is there any thing I should be aware of (read careful). I am gonna take the motor out whilst I do it, because I am going to re-paint the front of the motor at the same time its out. I was considering replacing the rings but I am not sure how big a job this is. As always any help or advice is greatfully received. Thanks David.
- Killerwhale
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Re: Valve stem seals
Well, i think you´ll find out changing rings and hone it will be easier than the seals...but as you in there and want to less the consumtion of oil i would def do the rings. Get a ring compression tool (it also helps with 4 hands)....and then you need a valve compress toolie (left this to others so i never seen one IRL)Kenvis Repesco wrote:I am gonna replace the valve stem seals on my TRX to try and improve the oil consumption issue. My question is...are there any special tools I will require, is there any thing I should be aware of (read careful). I am gonna take the motor out whilst I do it, because I am going to re-paint the front of the motor at the same time its out. I was considering replacing the rings but I am not sure how big a job this is. As always any help or advice is greatfully received. Thanks David.
- dandywarhol
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Re: Valve stem seals
I'm with above If the valve seals were shot it would smoke on startup and when you open up after deceleration.
I've yet to see a smoky TRX/TDM but I have followed a few and oil burning can be smelt under aceleration, indicating glazed/worn bores/rings - I go for the glazed problem to be the problem
I've yet to see a smoky TRX/TDM but I have followed a few and oil burning can be smelt under aceleration, indicating glazed/worn bores/rings - I go for the glazed problem to be the problem
1996 TRX 850, blue, Ohlins 46HRCLS, Race Tech Gold Valves, 0.90 springs, Venom pipes, R6 brakes............
1974 Yamaha RD250A, Candy Blue
1998 Yamaha SZR660, blue of course
1967 Yamaha TD1C 250, Blue and white
1974 Yamaha RD250A, Candy Blue
1998 Yamaha SZR660, blue of course
1967 Yamaha TD1C 250, Blue and white
- M.V.
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Re: Valve stem seals
Agree on the rings verdict, I would still replace the stem seals as well though, they're cheap & it's not much extra work.
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Re: Valve stem seals
My thoughts exactley. Thinking about it...a dealer recently told me the bores on the TRX are plated, maybe Nikasil like on the RGV's etc. Forgive my ignorance, when you say hone, does that mean just cleaning up the bores or actually removing material, thanks again David.
- dandywarhol
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Re: Valve stem seals
Only TDM 900 bores are ceramic plated - the TRX is plain ol' steel (or maybe it's cast iron). The problem with honing is that you can end up with too much piston/bore clearance - what you want to do is to "glazebust" the bores - a process which scratches the bore surface. Glazing is common with engines which receive too gentle a running in period thereby the rings and bores never properly bed in.
Here's a pic of a glazebuster...................attach the spindle to a drill and run the buster up and down the bores to produce a cross hatching effect which traps the oil to aid bedding in. New piston rings should then be used BUT the bore needs to be thoroughly washed in soapy water to remove any dust or you'll end up with more trouble. Another method I've seen used is to leave the cylinder outside overnight after a rainstorm to produce rust on the bore surface - but I think I prefer the glazebuster.........................
Here's a pic of a glazebuster...................attach the spindle to a drill and run the buster up and down the bores to produce a cross hatching effect which traps the oil to aid bedding in. New piston rings should then be used BUT the bore needs to be thoroughly washed in soapy water to remove any dust or you'll end up with more trouble. Another method I've seen used is to leave the cylinder outside overnight after a rainstorm to produce rust on the bore surface - but I think I prefer the glazebuster.........................
Last edited by dandywarhol on Fri Oct 05, 2012 11:04 am, edited 2 times in total.
1996 TRX 850, blue, Ohlins 46HRCLS, Race Tech Gold Valves, 0.90 springs, Venom pipes, R6 brakes............
1974 Yamaha RD250A, Candy Blue
1998 Yamaha SZR660, blue of course
1967 Yamaha TD1C 250, Blue and white
1974 Yamaha RD250A, Candy Blue
1998 Yamaha SZR660, blue of course
1967 Yamaha TD1C 250, Blue and white
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Re: Valve stem seals
He must be confusing the TDM900 (which has a plated bore) with the TRX which has a reborable cast iron bore.
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Re: Valve stem seals
Thanks so much chaps...really appreciated.
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Re: Valve stem seals
Mine smokes on start up so I'm guessing I need to get the same done to mine
Whats a bike shop gonna sting me for this ?
Whats a bike shop gonna sting me for this ?