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80hp Big Bore motor for stock


01bansheefox

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Bought a banshee off ebay and it came with a 409 Big Bore kit. The guy said it dynoed at 79hp. It has the Pro-X Big bore 409 mono block kit with a full drag port and polish. It doesnt seem to run and when i took it into the shop they said it needs a new top end. I dont know much about it i guess the guy said it has adjustable timing and other little goodies. As for the intake im not sure if it needs to go with the motor, its a Trinity Stage IV and has 35mm carbs with aftermarket reeds.

 

 

ummm........ I dont want to spend more $$ to repair it as I already spent it on the atv, Would like to do a straight trade for a running motor that also has goodies- prefering port&polish etc.....

 

"I am just posting to get an idea if anyone is willing to trade"

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any pics of the motor or bike and  did trinity build the whole motor  or do you know is it a powervalve motor or not. what billit stuff does it have on it if any..

 

i am in so cal may be interested

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409 is a odd size for one of our Cheetah kits (I'm not sure about the older designs though).

 

Unless the person bought a 400 and later bored it out and re-Nikasiled it, it's probably not a Cheetah...

 

But he states that it's a monoblock design, which is what makes it interesting. Do you have the link for it on eBay?

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Here is all the information I can get you guys thanks.

 

I have billet stuff for the motor but not installed.

 

For information on the engine go here.

http://www.lasleeve.com/

1. Click Menu

2. Click "Ask Tech"

3. Click Yamaha

4. Download 409cc Procross Big Bore Mono Block Cylinder

 

 

Here are the only Pictures

http://cgi.ebay.com/ebaymotors/ws/eBayISAP...2496969785&rd=1

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Trinity did not build the motor LA Sleeves did.

 

Im not sure if you want to believe the guy because he already stated it ran but didnt when I got it, but he said he runs 6's in the 1/8 and toped speed was like 113.

Edited by 01bansheefox
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i have a ported.30 over motor with a hot rods welded crank, new wiseco pistons. coolhead. this is the motor you got off e bay you said was trashed? any cylinder damage? scoring? how is the crank and cases? i gotta ask the link you posted was the bike that you said was trahed right? what carbs were on the motor?

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Yes that is the bike i got.

 

The carbs are 35mm carbs with the Trinity Stage IV intake and i "think" v-force reeds. There doesnt seem to be any cylinder dmg the guy just told me it needs a new top end and then he tried to tell me i need a new head but he is BS from what other people tell me. I guess the old owner used a screwdriver to get the head off and knicked up the bottom of the head. They did a complete tear down on my motor and said the clutch, gears bottom 1/2 of engine is in excellent shape and everything is still perfect. They will be open tomorrow i will have to call and ask again.

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Yes that is the bike i got.

 

The carbs are 35mm carbs with the Trinity Stage IV intake and i "think" v-force reeds. There doesnt seem to be any cylinder dmg the guy just told me it needs a new top end and then he tried to tell me i need a new head but he is BS from what other people tell me. I guess the old owner used a screwdriver to get the head off and knicked up the bottom of the head. They did a complete tear down on my motor and said the clutch, gears bottom 1/2 of engine is in excellent shape and everything is still perfect. They will be open tomorrow i will have to call and ask again.

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well if the lower end is complete and not torn apart im interested.i got a nice 92 .40 over milled head 155psi compression runs great starts up first kick in the summer i would think 2-3 in the winter.let me know whats up

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