Ive got a 250F TM 2009 with 25 hours on the clock
Inlet shim bucket smashed into the head . Barrell , botom end, and piston ok . snapped timing chain , slight damage to inlet cam lobe,
Need to know if any one else has had this problem and where to find the bits in Perth Western Australia or round the globe
Sad TM Rider
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Head off, valve spring compressors make it ewasy, tap a socket on the top of the retainer, this makes it easyer, remove the valve retainer, keep collets safe, pull old valve out, new one needs lapping in takes about 5 mins only, and will need reshimming if shimmed.
j24b engine D.O.H.C. U.S.A? open hood , look up. see white sticker, see clearances.? off online F.S.M Valve clearance specification when cold : 59 to 77deg F or 15 to 25deg C (engine temps) Intake: 0.0063 to 0.0094 inch (0.16 to 0.24mm) Exhaust: 0.0123to 0.0153 inch (0.31to 0.39mm) you must remove the bucket,tappet , to change lash. MIKE IT (that means a micrometer) then buy shims or new buckets to fit. (generic answer) the book says buy correct tappet after measuring, yours. and it's out of range, and doing the math first.
Valve clearance ideal setting is 0.10mm however as ideal replacement size shims are not always available use tolerance 0.05 to 0.2mm inlet and exhaust Procedure remove tappet cover rotate motor to tdc compression (inlet valve lobe pointing to rear wheel and exaust lobe to front wheel) measure clearance if no clearance depress cam bucket hold down by wedging a screwdriver or suitable tool (allen key) between cam bucket and cam remove shim measure with micrometer an relace with a shim 0.15 thinner depress valve remove wedge and measure clearance (if any) repeat procedure 4 each cylinder if clearance to large replace shim with a thicker one till clearance is in spec
Have they heard the noise or just you? Not hearing the click myself, it is quite possible that the exhaust manifold gasket has a small leak due to improper torqueing, crack, defect, or warp. I would sound mechanical but is actually air and would be intermittent at the early stages. Just to make sure, get a flash light and mirror and examine the exhaust manifold assemble looking for grey or black powder. It is a long shot but could be the issue, as could be a flat cam lobe, sticking valve from a bent or damaged guide, or other unforeseen abnormal conditions such a crack in a bucket.
You could try a super oil and see if it does not go away in a week. I have had them fix issues like this as well.
my mate says that if the gaps are bigger then its ok and that it's when they are smaller that u need to do something about them is this true?
bit of xtra info:
the manual says inlet 0.15mm and exhaust 0.25mm clearance.
my bike measures inlet 0.20mm and exhaust 0.30mm
i'm just a bit concerned 'cos if the worst happens i wo'nt be able to afford a top end rebuild.You should try and keep the clearance to 0.15 in and 0.25 ex.
With the de-comp it is cridical to have the exhaust clearance correct.
On the early 400/450 they had some cam problems so check the shim
buckets and cams are not worn.,