murp
Drag-strip hero
Posts: 239
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Post by murp on Apr 13, 2019 23:00:48 GMT 1
does it matter where the pistons are....... ie one tdc , or should they both be in middle of stroke...... or it dont matter....
cheers all
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Post by JonW on Apr 13, 2019 23:37:46 GMT 1
doesnt matter as the cyclinderis sealed from either side.
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Post by bernardo on Apr 15, 2019 17:42:22 GMT 1
In fact, for the hard of learning (me) does anyone have an idiots guide
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Post by stusco on Apr 15, 2019 17:51:34 GMT 1
In fact, for the hard of learning (me) does anyone have an idiots guide Try Dusty’s engine rebuild thread |
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Post by midlifecrisisrd on Apr 15, 2019 20:03:34 GMT 1
As long as they are both in the engine it's fine 🤣
Steve
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Post by JonW on Apr 15, 2019 23:04:38 GMT 1
Its easy, plug the holes, pressure to 5 or 6 psi and come back and check it after a bit, say 5. 15 or 30mins. see what its lost, hopefully nothing. YPVS do leak a bit but on an LC you prob wont lose much at all.
If youve lost pressure, grab some soapy water (I use window cleaner as it evaporates and is very bubbly) and spray it over the carb rubbers first, chances are thats where its leaking. Fix each leak and try again.
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Post by bare on Apr 16, 2019 1:31:27 GMT 1
Personally I've been dicking about/tuning 2 stroke bikes since '66.
Even fielded TZ's for Yama in early 70's... albeit in a previous life path.
Never actually done a leak down test. Never had motivation nor need to.
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Post by bare on Apr 16, 2019 1:32:32 GMT 1
Personally I've been dicking about/tuning 2 stroke bikes since '66.
Even fielded TZ's for Yama in early 70's... albeit in a previous life path.
Never actually done a leak down test. Never had motivation nor need to.
Never seized an engine either.
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Post by JonW on Apr 16, 2019 5:52:04 GMT 1
Yep, youve never had a leak bare... well not one youve seen  |
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Post by alexx on Apr 16, 2019 13:59:31 GMT 1
IMO the leak down test on 2T is to check air - compression leaking (seals, gaskets ..) or false air suction.
That is a completely different thing than pure compression test (piston vs rings vs cylinder vs head gasket).
So if you think that you engine is on low compression, check that first.
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