1994 Blastered the engine - options to replace/go faster?

urnvs

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Apr 1, 2012
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So I ended up with a burnt cylinder, cylinder head and piston on my 1994 Blaster :(

Should I look for just a new set, and maybe go oversize/high compression? What are the options for these quads? Any direct swaps available from other Yamaha's?

Or should I just be looking for a complete new engine and call it a day? Any suggestions on where to pick up the parts?
 
you can have that cylinDer bored to the next size, and replace the piston/rings
if you don't have a reputable shop nearby, check here...........

http://kenoconnorracing.com/index.html

then call ken
well worth the cost of shipping to know it's done right !!!
 
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Thanks. So there isnt a simple swap from another yamaha that will get me a bit more displacement?
 
Thanks. So there isnt a simple swap from another yamaha that will get me a bit more displacement?

nope, the only displacement adders are the 240 kits from vito's, CT racing
and L.A Sleeve
look to pay $600 - $1200 for those

and although adding those 40 CC's does make a difference, your stock cylinder with "porting" will smoke that unported vito's 240 kit.
boring your stock cylinder adds no power, porting it provides huge gains !!!!
almost double your stock 17 Hp. for few hundred bucks

the CT and L.A Sleeve 240 cylinders already have an upgraded port layout, thats why they're upwards of $1000+

check the link i supplied above, on the "prices" page for single cylinder porting prices,
add an aftermarket pipe, and filter + bigger carb
and hang the F on !!!!!!
 
you can have that cylincer bored to the next size, and replace the piston/rings
if you don't have a reputable shop nearby, check here...........

index

then call ken
well worth the cost of shipping to know it's done right !!!

Definately deal with ken!!!

If you really want more displacement (AND WHO DOESNT) the cheapest way to get it is to buy a vitos 240BBK for 600 and send it off to ken and let him work his mojo!

Your other option is to have ken rework your stocker and rechamber the head and do bolts ons pipe,filter,gears,reeds and so on.

Either way you go you wont be disappointed with ken or his work the mans customer service/work is second to none!
 
So I ended up with a burnt cylinder, cylinder head and piston on my 1994 Blaster :(

Should I look for just a new set, and maybe go oversize/high compression? What are the options for these quads? Any direct swaps available from other Yamaha's?

Or should I just be looking for a complete new engine and call it a day? Any suggestions on where to pick up the parts?

ok first and most important question.. how much money do you have? lol
i love my stroked and Flotek ported engine, i went with a airsal bbk personally and the gains were very impressive. only biotch about the airsal bbk is its nikasil'd meaning no boring and u have to send it out to be renik'd for around 300 bones
 
super noober - Im not going to dump a ton of cash into it cause they only sell for $800-1400 here locally so doing say a $600-1000 engine makes no sense :P That being said, since I have to replace these parts anyway I dont see why I shouldnt replace everything with upgraded parts since the labor is a wash either way.

How high can the compression be run up on one of these engines before one has to start using gas thats better than 91 octane pump?

Any point in doing any work to the cylinder head, other than possibly a slight shave to raise compression?

Are there any other inexpensive parts that commonly fail that are worth replacing while its torn apart?

Is there a copy of the service manual available anywhere to download?

Thanks again for any advice :D
 
super noober - Im not going to dump a ton of cash into it cause they only sell for $800-1400 here locally so doing say a $600-1000 engine makes no sense :P That being said, since I have to replace these parts anyway I dont see why I shouldnt replace everything with upgraded parts since the labor is a wash either way.

Well you'd think it wouldn't make any sense, but if you bought that $1400 Blaster what would you have? Pretty much what you just had last week. You know:
"Drrrrraaaa-daaaa-daaaa",,, "Hey, there go the big boys! wonder where they are going????"..."Draaa-daaa-daaaa"

So, with a little work and a few bits from the speed shop:
"BRAAAAAP-PAAAAAP!-ping, ping, ping-(hard braking)-BRAAAAAP!"
"Holy sh*te! Look at that Blaster go! See if we can catch it..."

Priceless


How high can the compression be run up on one of these engines before one has to start using gas thats better than 91 octane pump?

About 150-160psi to maybe 180 if you had a better cut head.

Any point in doing any work to the cylinder head, other than possibly a slight shave to raise compression?

All the point in the world in my books. I have this (seen here to be odd) view that high compression and advanced timing are counterproductive to top rpm power and reliability in a two stroke, but they do fatten up the mid-range a bit. The Blaster combustion chamber shape is so bad, almost anything you do to it will make it work better. You want the flat area of the chamber closer to the piston (about 1mm) but not too much compression, which works out good, because a larger combustion bowl will make more power.

Are there any other inexpensive parts that commonly fail that are worth replacing while its torn apart?

Clean the carb and the air cleaner, replace anything that looks bad, make sure all your bolts are loctited and tight, use a torque wrench, and always remember: too much of anything is a bad thing.

Is there a copy of the service manual available anywhere to download?

Thanks again for any advice :D

You got it already, hope you have fun.
 
So what I decided to do is look around for a used big bore cylinder & head...possibly even a stroker crank. Any suggestions on a good carb to match up to this setup? Ill be using the FMF exhaust.
 
Well you'd think it wouldn't make any sense, but if you bought that $1400 Blaster what would you have? Pretty much what you just had last week. You know:
"Drrrrraaaa-daaaa-daaaa",,, "Hey, there go the big boys! wonder where they are going????"..."Draaa-daaa-daaaa"

So, with a little work and a few bits from the speed shop:
"BRAAAAAP-PAAAAAP!-ping, ping, ping-(hard braking)-BRAAAAAP!"
"Holy sh*te! Look at that Blaster go! See if we can catch it..."

Priceless

best explanation ever! haha I laughed so hard at this
 
So what I decided to do is look around for a used big bore cylinder & head...possibly even a stroker crank. Any suggestions on a good carb to match up to this setup? Ill be using the FMF exhaust.

Alright, I've got a 48hp KTM motor in my bike, but my son is running Yamaha parts and is just about able to catch me on straight runs.
Both of us can out run pretty much any 350 or 450 quad we've run with. I'll give away the secret:

Stock carb properly jetted, it fits and works well up to 40hp. Make 40hp before you go larger.
Get your head machined, larger chamber, flatter quench, closer to the piston, or buy one already done and install it carefully.
Taller exhaust and intake ports if you want revs and big HP numbers and screaming power.
Don't alter the transfer ports too much but raising the cylinder with gaskets is an option.
Now you are ready for an aftermarket pipe, silencer and opening up the airbox.
This combo should give you 25-35 hp depending on choice of pipe and porting and headwork.

Somewhere here my son and I have a post of a low rpm torque motor we built with lowered cylinder.
Not big numbers, doesn't rev high, won't drag race, but a heck of a hill climber, wheelie machine, and trail machine.
 
I found a Vito's cylinder & head thats on its way to me as we speak :D Im definitely going to go with the stroker crank as well, any suggestions on where to pick one up (didnt see any here in the marketplace section)?
 
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The listing says the head needs to be re-worked 2mm for clearance, can you please elaborate on what needs to be done to the bottom end?