2T rebuild, failure, what went wrong??

[TrentMember]

That only works if the jerry is empty when you start otherwise you have to guess how much you’re going to put in. I think the tag is a better idea but I’m thinking maybe a tag that I can write on so I can log it otherwise I might top it up and not add oil straight away then see the tag and wonder if ‘4am tony’ did it and didn’t tell ‘post coffee tony’. Too anal?

[Bruce CurtisMember]

Austblue wrote:

Quote:

That only works if the jerry is empty when you start otherwise you have to guess how much you’re going to put in. I think the tag is a better idea but I’m thinking maybe a tag that I can write on so I can log it otherwise I might top it up and not add oil straight away then see the tag and wonder if ‘4am tony’ did it and didn’t tell ‘post coffee tony’. Too anal?

I have several cans, if there’s any left in the big 2T jerrycan, when I get back it goes in the Quad, or mower or amower/whippersnipper can.

I try not to use pre-mix more than several weeks old in the bikes.

So yes that is a good idea AB

[DeanMember]

I have a plastic jerry can with graduations up the side what I dont use on a ride I put in the bike straight after the ride(usually no chance of fuel going off around my place) If for some reason I dont put all the fuel in the bike I just use my rithmatic skills and work out the correct ratio “it doesnt have to be exact! ” Usually on a day ride I use my 10 litre container on a weekender like Dungog I will take the 20 litre.

Ollie

[alanMember]

i used to use the old tts the die in the oil let you no if there was oil in it .some of my mates used oil with red die in it fuel was red back than one of them stuffed up and buggered his bike and he was the one that baged me out about only using tts

[Anonymous]

Dick is sorry Micknmeld for your grief but is sure this could have been avoided Dick agrees with Trailboss regarding the reason for the ring breaking Dick also would like to point out the polishing marks on the non thrust side of the piston have most certainly been produced by excessive power demands on a cold and not yet up to temperature piston thus resulting in piston slap Dick must explain the piston does not have correct running clearances or its shape until up to operating temperature Dick would like to point out if the ring end cap was insufficient a ring related failure would have happened before 6hrs of operation Dick points to this fact if the said engine operated for 6 hrs at a average 5000rpm the piston would have gone up and down around 1.8 million times heating and cooling when the engine was started and stopped many a time in the 6hrs thus the failure if ring end cap related it would have resulted before that number

[Mick DMember]

Thanks for your input Dick, I have ordered the parts and hopefully the young fella will respect his new top end when it is cold.

It is amazing the difference in prices for the parts and it definately pays to do your home work and shop around.

To have our cylinder repaired and a Wiseco piston kit supplied here in Australia $592.00 :huh:

To get a brand new cylinder and OEM piston kit from JP parts in Japan $889.00 :ohmy:

To get a new cylinder, ported for more bottom end power by Eric Gorr (one of the best 2T men in the business), another head, trick pro circuit power valve and piston kit delivered to me ready to bolt on, from America. $660.

[drewMember]

hay mick, is that $660 Aust.$$ or US?

‘cos if $US it’s $722.971 at today’s exchange rate

[Mick DMember]

xy-transit wrote:

Quote:

hay mick, is that $660 Aust.$$ or US?

‘cos if $US it’s $722.971 at today’s exchange rate

AUD, I already converted it to save you the trouble XY……. :laugh:

[Bruce CurtisMember]

WTG Mick, That’s exactly the sorta stuff I’m getting done later this year (next summer) from all reports of Aussies who’ve had the mods done, the bikes are chalk and cheese after the Gorr treatment.
And top value for money.

BC

[Mick DMember]

After much deliberation and chin scratching I have been vindicated. I have worked out what caused the failure. Excessive wear in the power valve is what has caused the failure. Last night I inspected the power valve which is a 3 piece hinged affair. The hinge section had basically worn out, which has allowed the flapper section of the valve to extend further than it should into the exhaust port and one point of the flapper was able to actually touch the piston, therefore catching the ring and snapping it.
One of the points on the flapper on the power valve has been worn down from touching the piston prior to failure. All the marks on the piston and where the ring broke confirm this theory. That also explains the ticking noise I heard seconds before disaster struck.

[GregMember]

Mick I thought the same the other night while in the shed when I first looked at it, but it wasn’t and I can show you why if you bring the barrel and piston down here next week with you. There is a mechanical reason it wasn’t look closely. Even without the mechanical reason the prevents it contacting wouldnt the old piston would have contacted the flapper but it cant. The ticking noise was the broken ring catching the exhaust port.

I am convinced even more after you described the problem you had fitting the ring that broke that am installation problem caused it. Sorry mate

TB

[Bruce CurtisMember]

Yeah yeah, Mick did it, no I didn’t, No it was the terrible kawasaki Flapper P/V (stupid things zook RGVs used to do a similar thing ) yes you did blah blah its been broken and it happened who did what and why……. (all tongue in cheek lads too) noe the important stuff Mick, been waiting and waiting… I wanna know how the new E Gorr engine is running, how damn good is it?

Come on, will it kick an XR650s butt all over the track or what?

BC

[Mick DMember]

The new engine is running sweet as thanks Bruce, Eric Gorr has done a great job, I asked for more low down power and it certainly has that!! So much so,the young fella has had a bit of trouble coming to grips with it and at last weeks MX he was having all sorts of strife getting power to the ground. It should make a big difference when I get the big wheels and longer swing arm on it this weekend.

[Bruce CurtisMember]

Woohoo, all top stuff Mick.

Glad to hear it, and one day you can let everyone know how much it wasn’t?

Should put an end to any thoughts that we’re not being taken advantage of slightly locally for such work eh?

BC

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