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I am pretty sure I blew my rear cylinder head gasket.

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I am pretty sure I blew my rear cylinder head gasket.

PostAuthor: CrispyTurtle » Thu May 18, 2017 12:41 pm

Hello there. When one thing is fixed, another thing stops working. I think i'm starting to get how my bike runs now.

So I recently installed Larish41 exhaust onto my Route 66 (XV250) At first, I did not have it tuned right and it backfired, especially from the rear cylinder. I rejet and set the carb to where most of it was out, but some would manage to escape when you decelled from over 7k rpm. I was actually about to purchase baffles as I started to worry about the health of my engine when the worse seemed to be spotted.

Along the back side of the rear piston head (Where the head gasket is) you can spot a dark ring. I Also noticed when you decelerate now, you can hear a vacuum like sound as you do so. It sounds a little more raspy than usual when accelerating, but then here's the real treat.

When you whomp on the gas, wide open, you can spot puffs of smoke blasting out of the head gasket on the left side of the engine. Perfect.

So I am going to dismount my engine and take apart both top ends, just to inspect them. I already have my head new head gaskets here to put in. I hope I have not done any harm to the engine, but I will only be sure when I am inside of the heads.

That brings to question, are there any special tools I will need if I have to time the cam or valves? What potential damage could I have done if the gasket is gone? (Which it is) I have the Service Manual for my bike, so this shouldn't be too difficult, just sweat inducing.

Thanks for all the help and tips! :bike2:


Disclaimer: (This is not to bring harm against the reputation of Larish41 Exhaust. This is all user error and he is not the man at fault for what has happened. His exhaust system is crafted expertly and is a great exhaust kit. This Is My error, Do not be discouraged from buying Larish41 Exhaust. It's one of the best decisions you can do for your 250.)

CrispyTurtle
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Location: Georgia, United States Flag
Bike year & model: 1988 Yamaha Route 66 XV250

Color: Sand Beige

Milage: Over 9000

Addons: Windshield, Highwaybars, Lamps on Highway Bars, Sissy Bars, Saddle Bags, Luggage Rack, Front Fender Amber Lamp, Rear Sissy-bar Break lights, custom rear turn signals.
Sex: Male

Re: I am pretty sure I blew my rear cylinder head gasket.

PostAuthor: gtgrad02 » Sat Jun 03, 2017 10:03 am

Turtle, I'm about 99% sure you installed the exhaust wrong. You're not getting a good seal, which is why you see smoke. A head gasket fail would be mpre catastrophic (think BOOM). Did you replace the copper gasket for the pipe? Just do it.
2010 Yamaha V-Star 250 (XV250Z)
+ Floorboards: MCE Floorboards & Heel/Toe Shifter (P/N 300-301)
+ Pegs: Kuryakyn Long Right Angle Mounts w/Longhorn ISO-Pegs (P/N 7539), Magnum Quick Clamps (P/N 1002)
+ Risers: Rox Speed FX 2in. Pivoting Risers, Natural Aluminum (P/N 1R-P2SSN) *w/ stock risers
+ Front Sprocket: JT Sprockets 17T Steel (P/N JTR569.17)
+ Rear Sprocket: JT Sprockets 40T Steel (P/N JTR857.40)
+ Grips: Astra Depot Chrome/Rubber Grips (P/N M04-079-1) * w/ stock bar-end weights
+ Mirrors: i5® Chrome Cruiser Mirrors (P/N NML4)
+ Headlight: PIAA Xenon Blue Bulb (P/N BL-43B602)
+ Indicators: Stock "Lollipops" w/ 18-SMD/LED bulbs & load equalizers
+ Taillight: Bikers Choice LED Tombstone Tail Lamp (P/N 19155B) *Fender mod. required
+ Air Cleaner: K&N RC-1200 Universal Clamp-on Air Filter (P/N RC-1200)
+ Breather: Biker's Choice 74065S2 Chrome Crankcase Breather (P/N 60-3512)
+ Carb. Pilot Jet: Mikuni #20 (P/N KVM28/486-20)
+ Carb. Main Jet: Mikuni #120 (P/N 100.604-120)
+ Exhaust: "Larish41 v2.0" slash-cut, straight drag pipes (no baffles)
+ Misc:
+ Kuryakyn Turn Signal Relocator Kit (P/N 3155)
+ Saddlemen S4 Universal Saddlebag Support Kit (P/N 3501-0345)
+ Amanet Red Light Changer (P/N RLC-40)
+ Lockhart Phillips LED Turn Signal Flasher Relay (P/N 122-7500)
+ Cortech Super 2.0 Saddlebags (P/N 8230-0305-36)
+ Cortech Super 2.0 Tailbag (P/N 8230-0405-24)
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gtgrad02
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Re: I am pretty sure I blew my rear cylinder head gasket.

PostAuthor: Tom Boyte » Sun Jun 04, 2017 6:03 pm

Crispy,
Sorry to hear about your trouble. Thanks for the disclaimer. Many here on the forum including yours truly have run Larish 41's for years with nary a problem.
Tom

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Bike year & model: A 2014 harley Davidson Sportster "48"
1989 Yamaha Route "66"
1957 Cushman Eagle (restored) Motor Scooter
Sex: Male

Re: I am pretty sure I blew my rear cylinder head gasket.

PostAuthor: CrispyTurtle » Mon Jul 10, 2017 6:02 pm

gtgrad02 wrote:Turtle, I'm about 99% sure you installed the exhaust wrong. You're not getting a good seal, which is why you see smoke. A head gasket fail would be mpre catastrophic (think BOOM). Did you replace the copper gasket for the pipe? Just do it.


I replaced the exhaust gasket and boom, works like a charm!

This topic is null and void. It was a faulty exhaust gasket, not a head gasket.

CrispyTurtle
Junior Membership
Junior Membership
 
Posts: 22
Images: 2
Joined: Sat Oct 15, 2016 10:01 pm
Location: Georgia, United States Flag
Bike year & model: 1988 Yamaha Route 66 XV250

Color: Sand Beige

Milage: Over 9000

Addons: Windshield, Highwaybars, Lamps on Highway Bars, Sissy Bars, Saddle Bags, Luggage Rack, Front Fender Amber Lamp, Rear Sissy-bar Break lights, custom rear turn signals.
Sex: Male



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