overheating my new quadzilla???

JvtecDrsxM · 01-22-2011, 06:19 PM

I just got my quadzilla a few days ago and am pumped to own such an insane machine.... runs good, very hard starting when its cold tho but also today after fixing some minor things I took it out for about 20 min, just did some donuts and a little up and down the driveway since we have so much snow up here.... but when I put it away the coolant was boiling and pissing out of the overflow... I'm a pretty good mechanic but am not familiar with 2 stroke cooling systems and was hoping someone can help point me in the right direction???

CFM-Z440 · 01-22-2011, 07:22 PM

I would do a compression check, and maybe get a pressure tester on that cooling system. Most automotive shops or dealers should have the pressure tester

JvtecDrsxM · 01-22-2011, 09:07 PM

A compression check on the cylinder or the cooling system, would that cause it to overheat??

CFM-Z440 · 01-22-2011, 09:15 PM

Well a compression check to test the engine's condition, and also a pressure test for the cooling system.

If it would happen to have a leaky head gasket, it would cause low compression, hard starting, and overheating, by pushing combustion pressure (air pockets) into the cooling system.

The cooling system pressure test is actually the better way to check for it.

I like to warm the engine, shut it down, bleed off pressure, put the pressure tester on the radiator, then fire it and stab the throttle while watching the pressure gauge. If you see the pressure raise every time you hit the throttle, that is a good sign that your head gasket is leaking. However, this test can be tricky because as the engine warms, it will slowly build pressure as well. You should be able to tell the difference though.

JvtecDrsxM · 01-23-2011, 10:13 AM

Oooh ok thanks, what kinda psi should I be getting in the cylinder for a healthy motor?

Robhuffman · 01-23-2011, 10:56 AM

Get a service manual for the z and it will tell you everything you need to know to check it. The best 25 dollars I have ever spent. You can get one online or pick one up at a dealer. Gl.

JvtecDrsxM · 01-23-2011, 11:15 AM

Wut z???

CFM-Z440 · 01-23-2011, 01:23 PM

I think he ment zilla lol

I dont know what kind of compression those ran. It needs 90 to run, but if it only has 90, there's a problem somewhere.

Honestly, if you can get a hold of a leak down tester, that would be much better. Not everyone has one of those. Any decent dealer or small engine repair shop SHOULD have one though. That presurizes the cylinder, and measures how much pressure leaks by the rings. Or if the head gasket is bad, it will push pressure into the cooling system.

Ideal leak down is as low as possible, but its rare to see less than 2-5% 10% is average 15+ points to some problems, if it is beyond 20% Rebuild it no mater what. (That is all provided that it isn't blowing past the head gasket)

flattracker1 · 01-23-2011, 02:34 PM

well i love this site but i would go try www.quadracerhq.com...that site is very good when it comes to the old quadracers...very informative and nothing but the zilla and its little brother.... my opinion to the problem is you should have atleast 130-160lbs compresion...make sure the rad is very clean and the water pump is working....just an fyi the zilla is very mean but also is very high maintanancene...needs rebuilt every 15-25 hrs atleast....and if its an 87 the head bolts need upgraded to the bigger size like the other years....good luck

JvtecDrsxM · 01-23-2011, 03:44 PM

ok thanks, well I spoke to the previous owner and he never did the top end so I'm going to just go ahead and do the top end and really hope that it is the head gasket, I figure either way the top end def needs to be done so even if after it still is overheating I guess I'll start looking at the water pump....

CFM-Z440 · 01-23-2011, 06:13 PM

Post up some pics and share when you do it. I'd be interested in seeing more stuff about Zilla's around here.

Hughesc99 · 01-23-2011, 06:57 PM

Quote:

Originally Posted by CFM-Z440

Post up some pics and share when you do it. I'd be interested in seeing more stuff about Zilla's around here.

i second that. i used to love seeing the zillas race flat track at the monster truck shows back home. i had always wanted one. good luck with your bike!

JvtecDrsxM · 01-23-2011, 08:25 PM

Thanks guys, I have some pics on my phone just have to figure out how to get them on here from there. I ripped the engine out tonight, I didn't see any major bad spots in the head gasket but it certainly wasn't pretty. I did find out that the top end hasnt been touched in several years, about 4 years ago the previous owner took the head off to clean the carbon buildup in the head and that was all he could tell me, he doesn't know the last time it was rebuilt, I also checked the water pump impellar which seemed to be working fine, was in good visual condition and seemed to spin just fine. Just waiting to measure the piston and order my top end kit now.... I just hope this fixes my problem!!!

JvtecDrsxM · 01-24-2011, 07:00 PM

How can I post pics from my phone on here? I have a droid if that matters??

captain uno · 01-24-2011, 07:33 PM

Check your jetting.

01-22-2011, 06:19 PM	#1 (permalink)
JvtecDrsxM :::Rookie Rider::: Join Date: Jan 2011 Posts: 7	overheating my new quadzilla??? I just got my quadzilla a few days ago and am pumped to own such an insane machine.... runs good, very hard starting when its cold tho but also today after fixing some minor things I took it out for about 20 min, just did some donuts and a little up and down the driveway since we have so much snow up here.... but when I put it away the coolant was boiling and pissing out of the overflow... I'm a pretty good mechanic but am not familiar with 2 stroke cooling systems and was hoping someone can help point me in the right direction???

01-22-2011, 07:22 PM	#2 (permalink)
CFM-Z440 Super Moderator Join Date: Sep 2006 Location: Southern Minnesota Posts: 6,437	I would do a compression check, and maybe get a pressure tester on that cooling system. Most automotive shops or dealers should have the pressure tester __________________ 03 LT-Z 470 Max Power 12.5:1 94mm Piston, Hot Rods +5 Stroker Crank, Web Cams 539 (+6) IN / 539 EX, with Hot Cams sprockets, Ferrea +1 Valves, LTZ/DRZ springs (IN)DRZ springs (EX), DRZ Manual Decomp. Ported head, FCR 41 with Noss adaptor, Home made intake, Modified HMF Full System, Home made header, Trailtech flywheel, Dyna Programable 54hp 36ft lbs

01-22-2011, 09:15 PM	#4 (permalink)
CFM-Z440 Super Moderator Join Date: Sep 2006 Location: Southern Minnesota Posts: 6,437	Well a compression check to test the engine's condition, and also a pressure test for the cooling system. If it would happen to have a leaky head gasket, it would cause low compression, hard starting, and overheating, by pushing combustion pressure (air pockets) into the cooling system. The cooling system pressure test is actually the better way to check for it. I like to warm the engine, shut it down, bleed off pressure, put the pressure tester on the radiator, then fire it and stab the throttle while watching the pressure gauge. If you see the pressure raise every time you hit the throttle, that is a good sign that your head gasket is leaking. However, this test can be tricky because as the engine warms, it will slowly build pressure as well. You should be able to tell the difference though. __________________ 03 LT-Z 470 Max Power 12.5:1 94mm Piston, Hot Rods +5 Stroker Crank, Web Cams 539 (+6) IN / 539 EX, with Hot Cams sprockets, Ferrea +1 Valves, LTZ/DRZ springs (IN)DRZ springs (EX), DRZ Manual Decomp. Ported head, FCR 41 with Noss adaptor, Home made intake, Modified HMF Full System, Home made header, Trailtech flywheel, Dyna Programable 54hp 36ft lbs

01-23-2011, 10:56 AM	#6 (permalink)
Robhuffman :::Mini LT80 Rider::: Join Date: Jan 2011 Location: Buford, GA Posts: 151	Get a service manual for the z and it will tell you everything you need to know to check it. The best 25 dollars I have ever spent. You can get one online or pick one up at a dealer. Gl. __________________ 03 LTZ 400 alba nerfs with heel guards Tusk hand-guards with pro asv levers yoshi slip on w/uni filter and outerwears lid cover 155main, 27.5 pilot, and 1.5 turns out on fuel screw 660 petcock 400 exboot 13 tooth sprocket Custom seat cover Tag 1 1/8 bars 22/20 razor 2's/xcr's on tech 3 rears and itp 4/1 fronts elka stage 1 Fronts, Gt thunder rear alba +2 arms Precision stabilizer Looking for performance parts now ....

01-23-2011, 01:23 PM	#8 (permalink)
CFM-Z440 Super Moderator Join Date: Sep 2006 Location: Southern Minnesota Posts: 6,437	I think he ment zilla lol I dont know what kind of compression those ran. It needs 90 to run, but if it only has 90, there's a problem somewhere. Honestly, if you can get a hold of a leak down tester, that would be much better. Not everyone has one of those. Any decent dealer or small engine repair shop SHOULD have one though. That presurizes the cylinder, and measures how much pressure leaks by the rings. Or if the head gasket is bad, it will push pressure into the cooling system. Ideal leak down is as low as possible, but its rare to see less than 2-5% 10% is average 15+ points to some problems, if it is beyond 20% Rebuild it no mater what. (That is all provided that it isn't blowing past the head gasket) __________________ 03 LT-Z 470 Max Power 12.5:1 94mm Piston, Hot Rods +5 Stroker Crank, Web Cams 539 (+6) IN / 539 EX, with Hot Cams sprockets, Ferrea +1 Valves, LTZ/DRZ springs (IN)DRZ springs (EX), DRZ Manual Decomp. Ported head, FCR 41 with Noss adaptor, Home made intake, Modified HMF Full System, Home made header, Trailtech flywheel, Dyna Programable 54hp 36ft lbs

01-22-2011, 09:07 PM	#3 (permalink)
JvtecDrsxM :::Rookie Rider::: Join Date: Jan 2011 Posts: 7	A compression check on the cylinder or the cooling system, would that cause it to overheat??

01-23-2011, 10:13 AM	#5 (permalink)
JvtecDrsxM :::Rookie Rider::: Join Date: Jan 2011 Posts: 7	Oooh ok thanks, what kinda psi should I be getting in the cylinder for a healthy motor?

01-23-2011, 11:15 AM	#7 (permalink)
JvtecDrsxM :::Rookie Rider::: Join Date: Jan 2011 Posts: 7	Wut z???

01-23-2011, 02:34 PM	#9 (permalink)
flattracker1 :::Ozark 250 rider::: Join Date: Aug 2010 Posts: 276	well i love this site but i would go try www.quadracerhq.com...that site is very good when it comes to the old quadracers...very informative and nothing but the zilla and its little brother.... my opinion to the problem is you should have atleast 130-160lbs compresion...make sure the rad is very clean and the water pump is working....just an fyi the zilla is very mean but also is very high maintanancene...needs rebuilt every 15-25 hrs atleast....and if its an 87 the head bolts need upgraded to the bigger size like the other years....good luck

01-23-2011, 03:44 PM	#10 (permalink)
JvtecDrsxM :::Rookie Rider::: Join Date: Jan 2011 Posts: 7	ok thanks, well I spoke to the previous owner and he never did the top end so I'm going to just go ahead and do the top end and really hope that it is the head gasket, I figure either way the top end def needs to be done so even if after it still is overheating I guess I'll start looking at the water pump....

01-23-2011, 06:13 PM	#11 (permalink)
CFM-Z440 Super Moderator Join Date: Sep 2006 Location: Southern Minnesota Posts: 6,437	Post up some pics and share when you do it. I'd be interested in seeing more stuff about Zilla's around here. __________________ 03 LT-Z 470 Max Power 12.5:1 94mm Piston, Hot Rods +5 Stroker Crank, Web Cams 539 (+6) IN / 539 EX, with Hot Cams sprockets, Ferrea +1 Valves, LTZ/DRZ springs (IN)DRZ springs (EX), DRZ Manual Decomp. Ported head, FCR 41 with Noss adaptor, Home made intake, Modified HMF Full System, Home made header, Trailtech flywheel, Dyna Programable 54hp 36ft lbs

01-23-2011, 08:25 PM	#13 (permalink)
JvtecDrsxM :::Rookie Rider::: Join Date: Jan 2011 Posts: 7	Thanks guys, I have some pics on my phone just have to figure out how to get them on here from there. I ripped the engine out tonight, I didn't see any major bad spots in the head gasket but it certainly wasn't pretty. I did find out that the top end hasnt been touched in several years, about 4 years ago the previous owner took the head off to clean the carbon buildup in the head and that was all he could tell me, he doesn't know the last time it was rebuilt, I also checked the water pump impellar which seemed to be working fine, was in good visual condition and seemed to spin just fine. Just waiting to measure the piston and order my top end kit now.... I just hope this fixes my problem!!!

01-24-2011, 07:00 PM	#14 (permalink)
JvtecDrsxM :::Rookie Rider::: Join Date: Jan 2011 Posts: 7	How can I post pics from my phone on here? I have a droid if that matters??

01-24-2011, 07:33 PM	#15 (permalink)
captain uno :::Post Whore::: Join Date: Jul 2007 Location: Republic of Texas Posts: 2,179	Check your jetting. __________________ 2007 KTM 250 SX 2002 CR250R Feb 2009 QOTM (What my Z used to be) http://suzuki.theatvchannel.com/suzuki-qot...6939fa522478bfe "Come to me, son of Jor-El! Kneel before Zod!"

Remove Advertisements Sponsored Links
SuzukiCentral.com Advertisement