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TTR125 leaking out of the cam chain tensioner bolt
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TTR125 leaking out of the cam chain tensioner bolt - February 12, 2015, 12:16 AM

I just put on the big bore kit on the TTR125, now when it runs there is air coming out of the cam chain tensioner screw thing.

What Im not sure about is whether or not the space in the cam chain is supposed to be under pressure like that, and I just need a new tensioner with a good oring.

Or, is it something like a valve or a gasket leaking and messing up compression?
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February 12, 2015, 08:31 AM

The pressure in the upper system at the cams is the same from the lower end, which is not a lot, but certainly enough to push air through open points. Which specific bolt do you feel air from and is it pulsing or constant?


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February 12, 2015, 10:35 AM

It seems to be constant, its a very small amount, and its from the bolt that you use to release the pressure on the chain tensioner, its in a separate assembly that attaches to the cylinder http://i.ebayimg.com/00/s/OTYwWDEyOD...Thybv/$_35.JPG

The other thing is last night, when the bike was idling, i felt a burst of air through the same bolt and it died. The bike starts up and revs fine though, and no smoke is coming out of the exhaust.

I checked for oil leaks, nothing seems to be leaking either from any of the gaskets.

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February 12, 2015, 02:53 PM

Quote:
Originally Posted by 2wheelsarebetter View Post
It seems to be constant, its a very small amount, and its from the bolt that you use to release the pressure on the chain tensioner, its in a separate assembly that attaches to the cylinder http://i.ebayimg.com/00/s/OTYwWDEyOD...Thybv/$_35.JPG

The other thing is last night, when the bike was idling, i felt a burst of air through the same bolt and it died. The bike starts up and revs fine though, and no smoke is coming out of the exhaust.

I checked for oil leaks, nothing seems to be leaking either from any of the gaskets.
Yeah, dude. That's just an access point to reset the camchain tensionor. When you take the bolt out, it's wide open. No worries.


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February 12, 2015, 02:56 PM

Quote:
Originally Posted by superchickencornermonster View Post
Yeah, dude. That's just an access point to reset the camchain tensionor. When you take the bolt out, it's wide open. No worries.
The bolt doesn't come out, thats the thing. And it wasn't doing it before I put the big bore kit in. The air flow is very noticeable, and at idle when it died, it seems like the pressure just bursts over the o-ring in the tensioner.
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February 12, 2015, 04:41 PM

Ok, I'm confused. You feel air coming out of it when the bolt is in?


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February 12, 2015, 04:45 PM

Hey how the bike feel with the big bore kit? and what size did yhou go up to...
last...what is the total price on it?


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February 13, 2015, 12:38 AM

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Ok, I'm confused. You feel air coming out of it when the bolt is in?
Yeah, I did a leakdown test, compression is good, valves are good, seems like the oring in the tensionser is leaking from the crankshaft ventilation pressure.
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February 13, 2015, 12:40 AM

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Hey how the bike feel with the big bore kit? and what size did yhou go up to...
last...what is the total price on it?
TTR125LE with 150 BBR kit, yz85 forks, fmf powercore exhaust, opened airbox, performance air filter, VM26-606 carb. Its got torque, probably a little more than a crf150 due to its lighter weight.

Total is probably close to $2k, but its my project bike, if you want something faster get a CRF150R for that much.
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February 13, 2015, 01:01 PM

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Hey how the bike feel with the big bore kit? and what size did yhou go up to...
last...what is the total price on it?
I've owned/ridden a stock ttr, stock motor/suspension mods, done up SBK with decked out suspension and Bermisfiter (sp?) BBR150 motor, and a done up powroll 160 race gas bump start only bike.

Completely stock can be boring if you aren't railing against others on stock bikes. The suspension mods make the bike composed enough that you can have real fun. The TTRs at Cornerspin with BBR springs are a blast to ride for me. The SBK was just nasty and I really do miss that thing, and the race gas 160 got beat by the SBK on pump gas while drag racing in parking lots. Mind you, this is 75% riding on kart tracks and parking lots. The SBK on Shinkos in dirt and snow was still enough to throw me on my ass if I was riding lazy.

BBR kits are under 300 right now. You want a larger carb and pipe to get everything out of it. It depends on what you want the bike to do, but leaving it near stock, buying a built bike, or getting a CRF150R are the best routes to go IMO.


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