[benbour]

Just noticed some oil dripping while on a ride...pics attached..hoping someone can give me a place to start

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[retro]

Does your bike have an oil cooler on it? Check oil cooler & hoses if it does. Also check that the oil pipe going to the right side of the head isn't broken or leaking. Of course, check the rocker box cover too.

 

[SamUK]

As said, check the oil cooler if you have one fitted, other than that I'd say check your cam cover, could be blowing out oil around there. If you can't see it, clean it off realngood and start over

 

[benbour]

Thanks for suggestions...I'll look at all those

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[benbour]

Does your bike have an oil cooler on it? Check oil cooler & hoses if it does. Also check that the oil pipe going to the right side of the head isn't broken or leaking. Of course, check the rocker box cover too.

Wondering if this is where it's leaking from...if that's possible...no leaks yet as it's idling I might have to go for a ride to get it nice and hot enough to leak?

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[SamUK]

If oil is 'up' there then it has to be blowing out of the cam cover (top engine case) there are no oil pipes up there and I don't beleive the 250's were ever fitted with oil coolers.

Edit: Post a picture of the top of your engine for us to look at.

 

[shadetree]

that year trx250 did not come with an oil cooler from the factory.

 

[shadetree]

trace all your vent lines from rear differential.

 

[_Wilson_]

Gear oil has a distinctive scent too...... Nothing close to motor oil, and nope no factory installed oil cooler

Edit: I'd also check to see if the rear pumpkin is over filled, some people have, but i don't understand why they do, more is not always better ....

 

[benbour]

If oil is 'up' there then it has to be blowing out of the cam cover (top engine case) there are no oil pipes up there and I don't beleive the 250's were ever fitted with oil coolers.

Edit: Post a picture of the top of your engine for us to look at.

Here are some pics from top...it could be gear oil as someone suggested cuz I did smell it and it had almost a sour, bitter smell to it. Sorry I'm new at this so I don't know names for most things...I just take it apart once I know where the problem is lol

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[SamUK]

It may indeed be a vent/breather hose, it's certainly worth checking the rear diff oil level and blowing through the hose to make sure it's clear.

On the side of your engine towards the top (in the first picture) is a black rubber cap. It looks to me like this wants replacing, it's a bushing for the cam and also a seal. It is identical to a trx300fw so if you can't source an 85 trx part a 300 part would also do the job.

 

[benbour]

It may indeed be a vent/breather hose, it's certainly worth checking the rear diff oil level and blowing through the hose to make sure it's clear.

On the side of your engine towards the top (in the first picture) is a black rubber cap. It looks to me like this wants replacing, it's a bushing for the cam and also a seal. It is identical to a trx300fw so if you can't source an 85 trx part a 300 part would also do the job.

Thanks! I asked the Google and came up with this part:
Cap, cylinder head side. 12312-HA0-000

Is that as easy as pulling old one off and putting new one on?

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[SamUK]

Yes, it is quite a simple replacement. Undo all of the bolts on the cam cover and then lift the top off. You will then see the rocker arms attached to the cover itself, don't panic they can't fall off or get put back in the wrong way etc.
Once the cam cover is removed you'll see the cam itself, the rubber bush/cap slides over the end of the cam and then sits in the half round shape where you see it now.
Make sure 100% that you don't let the cam jump or slip as tooth on the gear when your fiddling around in there.

If your stuck, stop what your doing and post a picture and an explanation of where your at and we can talk you through the procedure.
You will also want to get some hondabond sealant to reseal the cam cover when you refit it.

 

[benbour]

Yes, it is quite a simple replacement. Undo all of the bolts on the cam cover and then lift the top off. You will then see the rocker arms attached to the cover itself, don't panic they can't fall off or get put back in the wrong way etc.
Once the cam cover is removed you'll see the cam itself, the rubber bush/cap slides over the end of the cam and then sits in the half round shape where you see it now.
Make sure 100% that you don't let the cam jump or slip as tooth on the gear when your fiddling around in there.

If your stuck, stop what your doing and post a picture and an explanation of where your at and we can talk you through the procedure.
You will also want to get some hondabond sealant to reseal the cam cover when you refit it.

Awesome. Thanks man. I've ordered the part and will jump in when it arrives.

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[retro]

Seeing that you are going to pull the rocker cover off, I have a couple more tips for ya. I assume you will be using the service manual as you go...? You'll need it.

First thing you should do is pull the valve covers off (when you get that far during disassembly) so you can watch the rockers move. Then take both plugs out of the left side cover and rotate the motor with a socket & ratchet until both rockers are down and stop moving, and you feel compression stroke resistance coming on strong... Then loosen the valve adjuster locknuts and back off the adjuster screws a couple turns or so. These steps insure that the cam lobes are facing down and the rockers & cover are not being stressed by the valve springs, which can cause the cover to cock and jam on dowels and bolt shafts (& possibly become warped) as you take it apart.

Another little issue you may have to deal with, may be seized up rocker cover bolts. If you encounter any that feel like they might snap off while loosening them in the pattern that the service manual shows, stop right there and think about it... sometimes tapping/hammering on the bolt heads will jar seized threads free, other times it won't be enough to save threads and/or bolt. Drilling and tapping out seized and snapped off bolts is a bugger on those, so use caution when taking them out.

Clean all mating surfaces well using alcohol or other drying solvent so your gasket sealer will have a good bond.

Adjust valves following the procedure in the service manual when it is back together,

Enjoy your work!

 

[SamUK]

Useful info there by @retro

Don't forget to check your diff oil level and diff breather hose for blockages, should keep you occupied whilst waiting for parts

 

[retro]

Do as SamUK says... universe may be nudging you to change that gear oil and catch up on other routine maintenance before some more serious ailment gains a footing...

 

[benbour]

Wow thank you all for the replies and great advice. My wife can go into labour any day now, so I may have to postpone for a bit. I'll update once I start though. Thanks again!

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