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Discussion Starter · #1 ·
hello all
I'm a newb to the forum and have a few questions.

I've worked as an auto mechanic for 11yrs and turn wrenches on my buddies quads and boats.

I'm currently doing a project TRX400es for a bud. He has a 440 big bore kit,(new cylinder, new piston.(12 to 5 compression ratio is what he told me), HotCams stage 3 cam, and a carb off of a 450, open airbox with a UNI filter, Moose ignition module, Header and DG Pipe.

My questions: 1. pump gas or higher octane race or aviation fuel.
2. 450 carb, what is the "hot start" and how does it work, what are the 2 electrical components on the carb? (one looks to be a TPS).
3. what problems can I expect to see with this setup?

Thanks to any and all who can help out.

Lawrence
 

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You will need to usw a higher octane fuel to stop predetonation and valve ping. I can't tell you what to look for asfar as problems.
The 450r has a hot start to help the 450 start when the motor is hot.
 

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Welcome to the forums. sounds like your buddy is going all out. 440 kits I've heard do not last long no durability in the engine once done. anything above 11:1 CR need 100 octane to perform properly some sites recommend 110 octane I run AVGAS it's 100LL and runs really cool in my quad. I havent had any issues wih it yet, AVGAS is a better qualit of fuel than MOTOGAS it has more testing done just for what it's purpose is. I wouldn't go with the 450R carb they are great but I think I would go custom Mikuni makes a nice 38mm flatside that would work great.
 

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I've heard the same about the 440 kits.
 

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I would also get new head bolts the stock ones wont hold up. Get a set of harden head bolts.
Yeah, I wonder if that's why they won't hold up? Maybe people aren't getting the hardened head bolts.
 
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