Piston wash TPE 1105 thoughts ?

[Freakie]

Too lean ?

 

[Blue]

Looks lean. Can you post pics of the domes?

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[jo5hi3]

I only see a small carbon patch on the front cylinder. Those pistons have black tops brand new, so reading wash can be a little tough.

 

[Freakie]

thanks guys.....that's what threw me as well....black tops huh....Blue... I will post up a pic of the domes asap (I still have 2 of your built motors a 781 and DASA 900 running very well )......doing a top end refresh on the TPE.....also found out I have cageless bearings installed but my new wrist pin bearings are caged....from a CR500....as supplied from DASA.......u think its ok to run them or should I wait for cageless

 

[Blue]

Thats great to hear. Im rebuilding a TPE 964 now using the cage style. I have not had any failures with the caged style unless you leave water in the motor and at that point cage or no cage its coming apart once they rust up. Everyone has an opinion but i think there fine. And yes with black pistons its always good to look at the domes too.

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[Wetbuffalo]

The newer TPE/DASA pistons use a caged bearing. The older ones used the cage-less bearings.

 

[Freakie]

Hello Wetbuffalo......Thanks for that insight....do you know for sure if the newer pistons can go into the older TPE motors...or are there differences in wrist pin diametre, piston heights etc.....Waiting on DASA to respond but all very quiet.....also cant seem to send Erik a PM...any idea how else I can find him. Also waiting on JM who supplied the kit.

Blue...here is a pic of the domes

 

[Blue]

Not the best pic but zooming in the domes look a little black but not terrible. One looks darker than the other unless its just oily hows it look up close to you?

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[Freakie]

yes....rear pot is darker than front pot....neither is oily to touch...quite dry....u think I should richen up rear carb a 1/4 turn on highs

 

[Wetbuffalo]

Hello Wetbuffalo......Thanks for that insight....do you know for sure if the newer pistons can go into the older TPE motors...or are there differences in wrist pin diametre, piston heights etc.....Waiting on DASA to respond but all very quiet.....also cant seem to send Erik a PM...any idea how else I can find him. Also waiting on JM who supplied the kit.

Blue...here is a pic of the domes
View attachment 403345

My understanding is that everything should fit together. I did get a set this spring that the pin supplied with the piston was not the correct size. Just do a test fit to make sure the pin slides through the needle bearing and piston.

 

[Blue]

Yes i would richen it a little, i thought it looked darker on rear. If ur freshening the motor maybe freshen the carbs too. Good luck with it.

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[Freakie]

Tks Blue As always your expertise and assistance is always very much appreciated Carbs are Novitec 48s have done them already.....still trying to see if my new pistons and bearings are the right parts for my older TPE 1105 .....hopefully I can run them ...otherwise I am a bit buggered between shipping back and getting the right stuff back...that's a month off the water because of where I live

 

[Blue]

Im rebuilding a 964 thats pretty old it used cageless bearings. I believe JM said it will run the kawi caged bearings with the pistons he sent. I havent test fitted the parts yet as i just got them. Maybe pm him i know he has been talking with Kyle and was told which parts to use. Actually the parts came from Kyle of Dasa, or now Kyle from Worx.

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[ngerk]

I assembled a new 1105 a couple months ago. It’s all dasa/worx stuff (cylinder, pistons, etc). I was sent caged bearings for a CR500 as well. I still have the part numbers on the box for the bearings and pistons if it helps any.

 

[Freakie]

Hello Blue....I have hit both Kyle and JM up already thank you....JM promised to clarify no word from Kyle yet....meanwhile I cleared up the caged bearing issue by doing a match up with the con rod small end and the caged bearing plus new piston pin inside .........that works 100% ....only issue now is the piston skirt is a bit longer than my old piston, but it may still clear the crank web without having to be cut down about 1,5 mm to match the old piston in total height....dont really want to hack it, if I don't need to....will try to mock install and see what clearance is as I rotate crank if I don't get any answer from the builders.

 

[Wetbuffalo]

Hello Blue....I have hit both Kyle and JM up already thank you....JM promised to clarify no word from Kyle yet....meanwhile I cleared up the caged bearing issue by doing a match up with the con rod small end and the caged bearing plus new piston pin inside .........that works 100% ....only issue now is the piston skirt is a bit longer than my old piston, but it may still clear the crank web without having to be cut down about 1,5 mm to match the old piston in total height....dont really want to hack it, if I don't need to....will try to mock install and see what clearance is as I rotate crank if I don't get any answer from the builders.

The piston skirt length is super critical. Or else the pistons will bind up. You might have to grind it down. When I installed the pistons in a 1021 the skirts had to be machined back more because they did not allow the crank to complete a full rotation. I might have had this issue because the pistons we received were for a 964 and the longer stroke may have caused this issue. But I would make sure they match your old pistons in total length and in the tapers/shape of the skirts.

 

[Blue]

Hello Blue....I have hit both Kyle and JM up already thank you....JM promised to clarify no word from Kyle yet....meanwhile I cleared up the caged bearing issue by doing a match up with the con rod small end and the caged bearing plus new piston pin inside .........that works 100% ....only issue now is the piston skirt is a bit longer than my old piston, but it may still clear the crank web without having to be cut down about 1,5 mm to match the old piston in total height....dont really want to hack it, if I don't need to....will try to mock install and see what clearance is as I rotate crank if I don't get any answer from the builders.

Thats definately an issue on strokers, not so much on the 964 as its a SS. I have had to cut pistons many times to make them fit with the longer stroke. Mocking it up will tell you for sure.

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[Storbeck]

@Blue, when you're looking at the domes what do you look for and what does it tell you?

 

[Blue]

@Blue, when you're looking at the domes what do you look for and what does it tell you?

If the pistons are black from carbon it would tell you its lean but with black piston domes its difficult to tell especially in a picture. In this case i like to see the domes to make sure they are not black which too indicates a lean condition. If the motor is really lean it will be black on the squish area as well. This area should be silver as the fuel trapped in the squish area should not ignite. Some times you will see a little color in this area but i dont like to see a black burnt stain. If you look at the dome pics posted above you can see a little sign of the black burnt stain on the rear cylinder squish area.

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[Blue]

Like i said its not best pic but notice the rear cylinder is blacker in the center of the dome and has a black stain on the squish area. See the arrow. The front has a more transparent look to it, like the fuel is washing the carbon off.

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