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Blow Up Engine!!!!!!!!!!!!!!!!

carlo jason imperial

carlo jason imperial

New Member
OT may i ask you guys if it is ok to remove the thermostat? i encountered blow up engine, my block and cylinder head had been seriously damaged, something that you cant imagine, as per my mechanic the main cause of this is my valve spring (sun valvespring) is too soft its valve floated and kiss the piston and his 2nd oppinion is that the engine overheated. the water pump is ok but he noticed that the thermostat when he pulled it out is closed and he think that this is also the reason why i overheated. and i tell him that my sensor in pannel did not flash but the sensor is working properly so as the radiator fan.

damaged: block, piston smashed, cylinder head, 2 exhaust valve head removed from its stem, connecting rod bend and lots of granules of the piston and cylinder wall and valve tip is inside the main engine. in total, its a DISASTER!!! pls reffer to the pic.


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john_carlo

john_carlo

Super Veteran
The thermostat is close for sure because the engine is cold.. The thermostat will only open when the engine is hot.. To test the thermostat put it in a boiling water if it open its good... Too soft valve spring lesson learn do not use untested parts...

And change your mechanic he did not know the function of the thermostat

Pero kung kinuha mo yung valve spring nung gabing yun or nung resced na sinabi mo di sana mangyayari yan...
 
emcid_ubp

emcid_ubp

Super Veteran
The main reason for that is you have a very soft valve spring. Sun racing valve spring is the same with your stock valve spring.
 
jackyper

jackyper

Super Veteran
emcid_ubp said:
The main reason for that is you have a very soft valve spring. Sun racing valve spring is the same with your stock valve spring.
Click to expand...
some expert mechanic if you used to load up you T135 with regards to thermo. they said it would be better to removed for much better cooling system... Regards to floated thats the result of using soften vlspring... vixion valve spring would be the best... lesson learned DO NOT use untested stuff for our bike
 
boytiempoh

boytiempoh

Member
valve float.
I encountered that kind of blown up engine in my friend's x1
actually,the one that kiss each other are the valves that's why the exhaust valves were removed
because before the exhaust valve can can the intake opened with the exhaust valve in the way.
 
coismist

coismist

Veteran
boytiempoh said:
valve float.
I encountered that kind of blown up engine in my friend's x1
actually,the one that kiss each other are the valves that's why the exhaust valves were removed
because before the exhaust valve can can the intake opened with the exhaust valve in the way.
Click to expand...
sir its ok to remove exhaust valve????
 
karlo

karlo

Super Veteran
aw.. but im still wondering, why it came to this point where your engine was so extremely damaged. Are you still running when you heard strange sound, of course this should make a sound, or your running at high rpm then boom.
 
carlo jason imperial

carlo jason imperial

New Member
@ all, im using stock cdi sun valve spring and faito cam when that happened, last month i install the rcdi together with sun vspring and it floated and that day i know whats the problem its the spring, so i removed the rcdi and put the stock back. but i didnt install and replace the sun vspring with my spare hispeed vspring. because of im too bussy. no time to open the cylinder to change all its parts together with the faito lightend valve. unluckilly me and my group decided to go to marilaque for a quick ride. at first theres no prob the sniper can run up to 120kph until when we were goin back home i noticed that malamya na ang takbo nya and i heard the sound like braaaanggsgss i thot that i just miss gear, goin on after a mile a 2nd branngagagagssgs i heard and thats the last engine stop my tire locked up and umiskwala ang likod ko, luckily it did not happened when time that i was in bangking mode it happened on a straight road. btw my speed is around 80kph when my engine blow and locked all gearings lucky i am not a single scratch. on me and on my snipey :) masuwerte prin ako at d ako nadisgrasya :) those set is just for test only kaya ko yun pinakabit, before ko yun pinakabit nag tanong muna ako s isang alam kong trusted mechanic near our place. and he sugested me some good parts i bought that parts he said pero dko parin pinakabit. ang pinakabit ko s isang bobong mechanic yung nka lagay ngaun dyan :) BTW that mechanic who sugested me the good parts is named JETRON here in pasig, he sugested jvt 57mm block faito ligtened valve and hi speed v.spring. nabili ko n mga yan before this tragedy happened. :) yun nga lang napaaga lang ang pag kabit ngaun ng mga reserve parts :) -JUST SHARING
 
coismist

coismist

Veteran
carlo jason imperial said:
@ all, im using stock cdi sun valve spring and faito cam when that happened, last month i install the rcdi together with sun vspring and it floated and that day i know whats the problem its the spring, so i removed the rcdi and put the stock back. but i didnt install and replace the sun vspring with my spare hispeed vspring. because of im too bussy. no time to open the cylinder to change all its parts together with the faito lightend valve. unluckilly me and my group decided to go to marilaque for a quick ride. at first theres no prob the sniper can run up to 120kph until when we were goin back home i noticed that malamya na ang takbo nya and i heard the sound like braaaanggsgss i thot that i just miss gear, goin on after a mile a 2nd branngagagagssgs i heard and thats the last engine stop my tire locked up and umiskwala ang likod ko, luckily it did not happened when time that i was in bangking mode it happened on a straight road. btw my speed is around 80kph when my engine blow and locked all gearings lucky i am not a single scratch. on me and on my snipey :) masuwerte prin ako at d ako nadisgrasya :) those set is just for test only kaya ko yun pinakabit, before ko yun pinakabit nag tanong muna ako s isang alam kong trusted mechanic near our place. and he sugested me some good parts i bought that parts he said pero dko parin pinakabit. ang pinakabit ko s isang bobong mechanic yung nka lagay ngaun dyan :) BTW that mechanic who sugested me the good parts is named JETRON here in pasig, he sugested jvt 57mm block faito ligtened valve and hi speed v.spring. nabili ko n mga yan before this tragedy happened. :) yun nga lang napaaga lang ang pag kabit ngaun ng mga reserve parts :) -JUST SHARING
Click to expand...
awts....:(
 
emcid_ubp

emcid_ubp

Super Veteran
carlo jason imperial said:
@ all, im using stock cdi sun valve spring and faito cam when that happened, last month i install the rcdi together with sun vspring and it floated and that day i know whats the problem its the spring, so i removed the rcdi and put the stock back. but i didnt install and replace the sun vspring with my spare hispeed vspring. because of im too bussy. no time to open the cylinder to change all its parts together with the faito lightend valve. unluckilly me and my group decided to go to marilaque for a quick ride. at first theres no prob the sniper can run up to 120kph until when we were goin back home i noticed that malamya na ang takbo nya and i heard the sound like braaaanggsgss i thot that i just miss gear, goin on after a mile a 2nd branngagagagssgs i heard and thats the last engine stop my tire locked up and umiskwala ang likod ko, luckily it did not happened when time that i was in bangking mode it happened on a straight road. btw my speed is around 80kph when my engine blow and locked all gearings lucky i am not a single scratch. on me and on my snipey :) masuwerte prin ako at d ako nadisgrasya :) those set is just for test only kaya ko yun pinakabit, before ko yun pinakabit nag tanong muna ako s isang alam kong trusted mechanic near our place. and he sugested me some good parts i bought that parts he said pero dko parin pinakabit. ang pinakabit ko s isang bobong mechanic yung nka lagay ngaun dyan :) BTW that mechanic who sugested me the good parts is named JETRON here in pasig, he sugested jvt 57mm block faito ligtened valve and hi speed v.spring. nabili ko n mga yan before this tragedy happened. :) yun nga lang napaaga lang ang pag kabit ngaun ng mga reserve parts :) -JUST SHARING
Click to expand...
awts di mo pa kagad sinunod si kuya Joy...
 
MickO_HCMC

MickO_HCMC

New Member
I have removed my thermostat a long time ago, bike runs fine no overheating.
Thermostat is only there to let the engine warm up faster (especially in cold climates), as I live in tropical Vietnam, it is not that critical and I felt it was hindering the flow of coolant around the system (just make sure you warm the engine properly before revving).
current spec of my bike;
Yamaha Exciter (T135 in Vietnam) 183cc
UMA super-head (sport) 23mm inlet/20mm exhaust
UMA cam
63mm Malossi bore kit
Malossi Electric coolant pump
28mm Keihin PWK carb
Nology Pro-fire coil
nology Hotwire lead
Iridium spark plug
Shorai Lithium Ion battery
DNA airfilter (top completely cut out of air box)
Stainless header pipe (with modified standard muffler approx. 33mm end bore)
Oil cooler (KTL Tecnic)
Stainless steel oil filter (FLO)
Racing clutch springs (Std. plates)
RCDI (Red Plug)(Thinking about UMA / IMC) 15F/41R sprockets (Hoddaka)
Chain (428 VX DID)
Standard front forks
295mm front disk (RB) with standard caliperRPM rear mono shock (rebound adjust)
std. rear disk and caliper
Tires F; 70/90 R; 100/80 Michelin Pilot Street
 
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