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LTR450 Quadracer => LTR450 - Engine => Topic started by: JPW59165 on January 05, 2013, 10:28:12 am

Title: Re: Yoshi "Cherry-Bomb" question
Post by: JPW59165 on January 05, 2013, 04:05:15 pm: It doesn't just let the engine rev higher, it accesses another tune pre-programmed into the ECU (like a switch) that adds more fuel to the combustion chamber due to the increase in air flow and less restrictive exhaust. The "accessible" tune probably has a higher spark timing as well along with other little tidbits.

I don't need more fuel, machines are tuned for sea level, I am at approximately 4250'. If anything I need it to run leaner than normal, for example:

My LT250R is jetted from the factory with a 45 pilot, needle on 3rd clip, a 210 main jet and air screw 1.5 turns. I run a 45 pilot, needle on 2nd clip, a 195 main jet and air screw almost 1.75 turns out to compensate.

Well, I ended up disconnecting the battery, then unplugging the Cherry Bomb, and reconnecting the battery. Hopefully this is good to go.
Title: Re: Yoshi "Cherry-Bomb" question
Post by: El Diablo on January 05, 2013, 01:45:23 pm: Quote from: Dezsled on January 05, 2013, 12:02:24 pm
It's a plug in that let's the ignition rev a lot higher. Must have item imo. Google has pics.

Not to be confused with the Answer Roost Boost. The Cherry Bomb actually works on the LTR.
Title: Re: Yoshi "Cherry-Bomb" question
Post by: Dezsled on January 05, 2013, 12:02:24 pm: It's a plug in that let's the ignition rev a lot higher. Must have item imo. Google has pics.
Title: Re: Yoshi "Cherry-Bomb" question
Post by: Mitch Keller on January 05, 2013, 11:53:04 am: Whats a "Cherry Bomb" ?
Title: Re: Yoshi "Cherry-Bomb" question
Post by: Dezsled on January 05, 2013, 10:49:21 am: When I got my ltr450 I rode it without the cherry bomb... Then installed one, I wouldn't ride it without one after that! Increased rev ceiling, way more power... Wheelied a lot easier. I never removed it so I don't know how to reset it to stock.

IIRC there was a plug (similar to a child resistant safety plug for wall outlets) that went into the cherry bomb plug in when it wasn't installed in the wiring harness.
Title: Yoshi "Cherry-Bomb" question
Post by: JPW59165 on January 05, 2013, 10:28:12 am: I just bought this 07 LT-R450 and of course the previous owner removed the sparky, air box lid and had a Cherry-Bomb installed. The races I participate in require a sparky, and sometimes I ride in mud/water. Is there anything special to removing the Cherry-Bomb when I put the sparky and lid back on?

Do I need to disconnect the battery, then remove the Cherry-Bomb so that the ECU resets back to stock tune?