Is this silicone-based

Yes...if you look for Threebond products you'll find similar sealers and better information (Synthetic rubber/RTV/Silicone based) , Threebond 1104 is grey in color Like Yamabond 3 and has a 150deg. Celsius max temp, Threebond 1215 is also grey in color and has 250deg Celcius max temp...I believe Threebond makes the Yamabond 3 , it just gets private labeled...I use Yamabond 3/Threebond 1215 on all my engine cases since the 70s, works great...the Threebond brand may have a cost savings when compared to yamabond 3...both are kinda gooey to work, a Popsicle stick may help you spread it on mating surfaces prior to assembly...a little goes a long way...hth

Can I use on crank case on dirt bike.

I used the product on my Yamaha golf cart engine. It is for sealing a split case engine. Have not had any leakage. thx, John

Will this seal a split case of a 2000 Yamaha Roadstar 1600cc engine? full of power and heat.

Yes and I think it's the best sealant there is! I use it on air cooled split case vw's and it works awesome!

Can this be used on valve cover gaskets to help seal ?

yamabond is normally used in a metal to metal sealing application....like between sealing two engine cases together ( typical in motorsport applications)...for valve covers on American cars...I suggest Permatex "The Right Stuff" P/N 85224 ( about $22)...Amazon has it listed...most factory OEMs use this Permatex product for their valve cover sealing on V-8 and V-6 engines...hth

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Yamaha Original OEM Yamalube Yamabond 4 Silicone Based Liquid Gasket Yamaha Part# Acc-YAMAB-ON-D4 - (1) 2.5 oz Tube

Yamaha Original OEM Yamalube Yamabond 4 Silicone Based Liquid Gasket Yamaha Part# Acc-YAMAB-ON-D4 - (1) 2.5 oz Tube

Product ID: 13671964

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Details

Material
Silicone
Brand
YAMAHA
Style
Compact
Item Weight
3 Ounces
Item dimensions L x W x H
17 x 8 x 9

🔥High Temp Resistance

⏱️Cures in 60 mins

🛠️OEM Quality

Description

🔧 Seal Your Success with Yamabond!

QUICK CURE - Sets in just 60 minutes, so you can get back to what you love faster.
HEAT WARRIOR - Withstands extreme temperatures, ensuring durability in any environment.
OIL DEFENDER - Resists gear and engine oil, keeping your machinery running smoothly.
SEAL THE DEAL - Achieve a flawless seal with Yamaha's precision-engineered formula.
ENGINEERED FOR EXCELLENCE - Designed specifically for Yamaha products, guaranteeing compatibility.

Yamaha Original OEM Yamalube Yamabond 4 is a silicone-based liquid gasket that comes in a convenient 2.5 oz tube. It cures in just 60 minutes, forming a robust, rubber-like seal that withstands high temperatures and resists engine and gear oils. Specifically designed for Yamaha products, it ensures optimal performance and reliability.