Cali421 Posted January 5, 2017 Report Posted January 5, 2017 I have a 421 cheetah pv, bought the bike with this motor few months ago. Anyhow after riding it and feeling like it wasn't at its full potential I started reading threads on trinity pv motors and issues with domes and so on. I purchased a billet head from chariot so that I could use common domes, spoke with a builder and he asked for deck height in order to cut domes. So I tore the head off and did a squish test with 0.62" resin core solder just to see where it was and it did nothing to the solder.I've been running 100 sunoco. And also on that same side the dome and piston are pitted. I haven't done a squish test on other side yet but will soon and get some pics. Also couple weeks ago did a compression test with craftsman tool and came up with 150psi on both sides. Need help figuring out what caused this and what I can do to fix it. Can I just buy new pistons (573mo6800) hone and go? Thanks for any input Quote
trickedcarbine Posted January 5, 2017 Report Posted January 5, 2017 Deck height is measured at the edge of the piston crown. Get the motor at TDC and measure from the deck of the cylinder to the edge of that crown. Quote
Cali421 Posted January 5, 2017 Author Report Posted January 5, 2017 Sent from my SM-G900T using Tapatalk Quote
Cali421 Posted January 5, 2017 Author Report Posted January 5, 2017 In understand that trickedcarbine thanks Sent from my SM-G900T using Tapatalk Quote
J-Madd Posted January 5, 2017 Report Posted January 5, 2017 You said you tore the head off and did a squish test??! The solder is bent like you did it correctly. So I figure that you just typed that unclear. What was the squish on the good side? Too much squish can cause deto as it can leave unburnt end gases in the combustion chamber. They can ignite at the wrong time. Edit: by the look of that oring water could've caused that. Squish is still too big though. Quote
Cali421 Posted January 5, 2017 Author Report Posted January 5, 2017 (edited) Yes I did the squish test just to see if that's why the power was lacking. When I got the bike it was low on coolant but added blue stuff and it hadn't lost any since. Edited January 5, 2017 by Cali421 Quote
registered user Posted January 5, 2017 Report Posted January 5, 2017 Too much squish can cause deto as it can leave unburnt end gases in the combustion chamber. . u know what else causes deto. hot intake mixture from hot crankcases( remember zillas proposal to run the mtr hot as possible without over heating) Quote
n2otoofast4u Posted January 5, 2017 Report Posted January 5, 2017 u know what else causes deto. hot intake mixture from hot crankcases( remember zillas proposal to run the mtr hot as possible without over heating)You are so fucking stupid it baffles me that you can wipe your own ass! Quote
registered user Posted January 5, 2017 Report Posted January 5, 2017 run along son. no room for washed up nobodys like u Quote
registered user Posted January 5, 2017 Report Posted January 5, 2017 (edited) zilla u can call me all the names u want but your all wrong with your statment of running a 2stroke engine hot. hate to tell ya but its been tested millions times. 150f would be perfect but unfortunatly youll never be able to comprehend the reasons why. some day u might snap into reality but i doubt it. Edited January 5, 2017 by registered user Quote
registered user Posted January 5, 2017 Report Posted January 5, 2017 u must be trying to twist this around. i made it perfectly clear in the other thread we are talking water temp Quote
registered user Posted January 5, 2017 Report Posted January 5, 2017 so what do u have to say now? when im home later i can post some stuff from the ktm book thats tangible so u can believe it since u dont believe me. or is ktm just a bunch of tards also ? Quote
ClaudeMachining Posted January 5, 2017 Report Posted January 5, 2017 Make love, not war Envoyé de mon SM-G935W8 en utilisant Tapatalk Quote
registered user Posted January 5, 2017 Report Posted January 5, 2017 You still don't get it, like I said, you will never get it. then be more clear what your talking about. Quote
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