A forum for owners of Yamaha TTR250 trail and enduro bikes!

Steveo · Member

Ttr250 help!

TTRfan · Super Guru

Hi Steve and welcome to the forum.

You will need to get the engine to TDC, pop out the tensioner and take the caps off one of the camshafts so that you can move the camshafts into their correct positions.

You may find some of this thread useful http://www.ttr250.com/Removing_Cylinder_Head/TTR_head_removal.htm

Good luck but if you need help just ask wink

Brian

Steveo · Member

Thanks for the reply, I have been reading a lot of the write ups on here that are really good I must say. I have asked my neighbour to be honest with me so I have got half a chance!! He told me that he turned the engine with the cam tensioner out by mistake and the chain slipped around the sprockets. Probaly why nothing is lining up then!

So if I put the chain on get the engine to TDC take the tensioner out then I can move the sprocket into position? My only worry is how I then get the second one right? Other thing I was worried about is being at the right TDC. My neighbour nice as he is has made a right dogs dinner of this!

People should know there own ability and not touch things!!

TTRfan · Super Guru

"take the caps off one of the camshafts so that you can move the camshafts into their correct positions"

Steveo · Member

Cool, one thing TTR fan I looked at that link re cylinder head removal, the markings on the photo in that link of the cam sprocket markings are different to what page 4-62 of the workshop manual show?

TTRfan · Super Guru

Looks the same to me confuse

Camshaft positions.jpg

Steveo · Member

Yes that's clear now I couldn't see the E on the intake can or I on the exhaust one that's why, (in manual) so if I take caps off tonight put cams in right place, put caps back on and tensioner in then rotate the engine (clockwise) I should solve it? Or am I being thick again this thing is a mind fook

TTRfan · Super Guru

So long as you have turned the flywheel to TDC ( difficult to hold it there as the magnets try and move it which is why I get Mrs TTR to assist by holding a socket on the flywheel bolt if I can!) and the camshafts line up as in the photo and diagram you will be fine.

Post up a photo if you want us to double check wink

Fit the tensioner and check again to make sure nothing has moved and, if it all looks OK, turn the engine over using a socket on the flywheel bolt to make sure everything turns freely. Take the spark plug out to make this easier. Also do a simple compression check by putting your thumb over the plug hole and it should be forcibly pushed off if things are good. That is just to make sure your neighbour hasn't bent a valve by having the cam timing wrong

Brian

TTRHead · Senior Member

Is this right on my pals one Brian?

put it on loose for now as not sure is right...

wecome Steve are you Steve from the hearts trf?

-- Edited by TTRHead on Friday 24th of June 2016 08:50:20 PM

ttr steve · Super Guru

Looks good smile smile smile

Is it with the tensioner in place?

-- Edited by ttr steve on Friday 24th of June 2016 10:38:57 PM

TTRHead · Senior Member

Yeah but I think the intake (left hand side as you look at screen is wrong.

TTRfan · Super Guru

Sorry - only just got back from the pub.

Looks good to me too biggrin

Why do you think it is wrong? Cam lobes and marks as per the manual.

Brian

TTRHead · Senior Member

i think its because i was reading the posts above. I noticed the E also...Mine looked the opposite way around to your photo.

Steveo · Member

Done mine but when I start it the engine turns over ok it doesn't fire up! Took plug out its bone dry. Shouldn't it have fuel on!

TTRfan · Super Guru

If you undo the drain screw on the carb float bowl does fuel flow out?

Steveo · Member

Yes I have fuel coming out of there, also the fuel comes out the fuel tap on tank I have tried to start it a few times now and it's dry the plug I would have expected it to be fuelly

TTRfan · Super Guru

I would expect the plug to show some petrol and the exhaust to start chucking out petrol fumes.

Have a look through here for a good check list.

Steveo · Member

Done that thumb over the spark plug hole thing! feels low on compression it didn't blow my thumb off!

TTRfan · Super Guru

Put a small amount of oil down the bore - enough to go around the outside of the piston and sit on the rings.

If compression doesn't improve then there may be a bent or damaged valve cry

Steveo · Member

I have set my timing up as per ttrhead, is that the correct way I noticed that the photo you posted ttrfan the E is facing the opposite way.

Ttr head yes I am Steve from Herts TRF. Although not renewed my membership!!

Steveo · Member

Yeah still not starting thanks for all your help ttrfan. One last thing before it goes in the skip first thing Monday morning you think I could try pouring some fuel in the plug hole?

TTRHead · Senior Member

i dont see why you cant pout petrol in the plug hole?

ttr steve · Super Guru

Steveo wrote:
Thanks for the reply, I have been reading a lot of the write ups on here that are really good I must say. I have asked my neighbour to be honest with me so I have got half a chance!! He told me that he turned the engine with the cam tensioner out by mistake and the chain slipped around the sprockets. Probaly why nothing is lining up then!

So if I put the chain on get the engine to TDC take the tensioner out then I can move the sprocket into position? My only worry is how I then get the second one right? Other thing I was worried about is being at the right TDC. My neighbour nice as he is has made a right dogs dinner of this!

People should know there own ability and not touch things!!

Hi Steveo

Just reading this again, if he turned it over on the starter without the tensioner in, he has defo bent the valves cry That is why you have no compression, don't skip it yet You may have a bit of work to do, but all is not lost.