98 fc600 max potential? problems to watch for?

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cpcpatriot

cpcpatriot

Joined
Apr 20, 2006
Messages
11
ok well let me introduce myself.

I am a ATV drag racer and have played alot with the YFZ 450 the last few years.

we do hillclimb/drag racing and try and get the most we can out of our stuff without going crazy on the $$$

well i have tried about everything out on the yamahas so its time for a new project.

i recently purchased a 1998 fc600 motor
CLICK HERE FOR AUCTION
it is going to be going into a lightweight custom atv drag frame. my current yfz is a stock sized engine on gas and makes 50hp at the wheels. I have had a stroker yfz that i sprayed nitrous on and made 74hp at the wheels

i would like to make over 60 hp all motor with the 600 and then be able to spray 30hp of nitrous on it. anybody know the durability of the rods/cranks that i should be concerned about.

the carb and pipes will be custom and use the theroys we have on our other four stroke bikes but other stuff like cams i dont know.

want to keep the compression stock on it to handle the extra NITROUS. it is worth giving up just a little all motor performance to spray 10 extra hp.

so basically it needs cam and porting for sure. exhaust will be custom megaphone drag pipes. carb will be big lectron. piston stock compression to spray more at it

the end result needs to be a 90hp+ engine in a very lightweight frame

what do i need to look out for on this engine for durability. I dont want to spend all the fabrication time and money just to blow it up, and is the 98 still easy to get parts for??

thanks for any help
Dave

here is my current ride
1.JPG
 
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I think "90 hp" and "durability" in reference to a single cylinder motorcycle engine could be mutually exclusive.

Also, if I did happen to be inebriated enough to ride a quad, I would choose one with front brakes. :D
 
I know there are dirtbike hill climbers out there running these big motors on alot of NITRO methane and they have to be up there on there hp.

front brakes only add weight and slow you down neither one is needed on a drag bike :twisted:

has there been a week link in these motors that i should look into before pushing it?

honestly a drag bike doesnt get near the hours of riding on them and they are rebuilt more often. so 20 hr increments arent that big of a issue on rebuild times. but cranks and rods can get costly. piston swapping isnt that big of a issue
 
How tight do you plan to turn it?
How much N2O?
How often are you willing to do the lower end?
How much money are you willing to spend?
Why a Lectron?

Dale

Click my gallery link for dyno graphs.
 
we dont have any turns we drop the clutch at redline and go straight

Nitrous, I have sprayed 20-25 on my 450 and others have sprayed 30+ i was thinking in the 20-30 range would be needed to get my goal of 90hp.

Lower end is the touchy one. I dont want to have to do it to often. if the lower end wont hold together under that much power than maybe i need to back off. there is a 575 built honda(450 based) laying down 75hp who is having a problem keeping his lower end and cases together

money spent. I would prefer to be able to do a cam and porting ($less than $1000) and have a good running machine. if i have to spend more for durability than i will.

we have played with fcrs in different sizes but for drag applications the lectrons have been better. better midrange and peak hp and we can get bigger carbs. I run a 44mm on my 450 and it is a nice increase over a 41 fcr.

also are there stator problems with the 98s?? is there a upgraded electrical system i should be looking into?
 
i guess another factor is if i blow it up, how hard are parts to find. I am assuming it will be fairly hard

so say i setup the chassis for the 98 600. are the new 650s the same mounting locations???
 
Ah ha......I wondered if the person that beat me out on that auction in the last 8 seconds would be on here. If you do blow the engine up, I need the head.
 
Nice motor for bergs too bad you are going to turn it into scrap, You will be putting large holes in the cases as you will see that this long stroke motor does not rev like I think you think it does.You did not do your homework. There has to be motors out there with much larger crank bearings than this poor motor you have found.And the parts supply, good luck. A rod kit will cost almost as much as you paid for the motor. You will surely put on a show for everyone at the drags as you drag your quad back to camp.
 
As we Husaberg owners are desperately try to preserve our motorcycles in any way we can, we have a quad owner who is desperately trying to destroy all the parts that might be available to repair our motorcycles that are in short supply. It's just like when the unlimited hydroplane racers were buying all the Rolls Royce motors and making it impossible for the people that owned P51 Mustangs and Spitfires to purchase engine parts for their planes. Luckily, since they ran out of Rolls Royce engines they are now using turbine engines to run the unlimited class racers, like Miss Budweiser.

Why don't you use an engine that is readily available out of some Jap bike and spray it with 90HP and just throw the motor away after every other run? I am sure that there are many Husaberg owners that would purchase this motor from you just to keep their bikes running!

Thanks for your consideration to the Husaberg afficionados.

May the Force not be with you.
 
My feelings closely match those of coronaberg.
While I do find the project somewhat interesting (at least as interesting as I can get interested in a quad) I too predict that the engine will self destruct in short order and destroy what would otherwise have been a good resource for scarce spare parts for those of us who are still own, ride, and enjoy early bergs. I missed the auction and you did place the highest bid, so it is yours to do with as your please, but there are much better choices for your intended use.

I managed, in my earlier years, to hold two national dragracing class records, one in AHRA and the other in NHRA, so I understand your attraction to going in a straight line for a short period of time. No matter what engine your elect to run in your drag quad you will spend more time wrenching it than riding it , but with the 600 berg engine the proportion of wrench vs ride time will be totally disproportionate and expensive. Don't do it.
 
ok now thats a nice attitude there boyz

your are a quad guy and you shouldnt get to play with our precious berg motor

what jap motor have i overlooked that would be a good choice???

and if you havent noticed most jap dirt bike motors sell for well over 2k so a berg at 1/4 of the price is great as long as i dont scater it

i am still running the original bearings in my little 450 and in its life it has had over 200lbs of nitrous on it.

I am not amatuer at this who is just got a crazy idea. I have a passion and desire for going fast. I didnt run into the auction until there was 3 hours left and i didnt have time to do the footwork before it ended. so here i am now

how fragile are the bearings and rod compared to a little 450 motor

i know the extra long stroke isnt going to rev out like the little motors i play with but if i can run 8-9 rpm that is plenty.

so please leave the we are husaberg owner attitiude out and lets just discuss the downfalls of the engine as far as engine parts go

are the new 650 the same motor mounting bolts so if a guy has a problem with a old motor he can get a replacement??

I know the husaberg are very popular in the usa for hillclimbing and thoose guys arent any easier on your beloved engines, alot of them run MAJOR NITRO and that is worst than nitrous imo.

and i am not going to spray 90hp, 20-30hp with nitrous

20 is fairly conservitive as is 30hp. hoping the motor can make 60+ on its own
 
Sounds to be a fun project, unfortunately reliability will be your limitation.

75 RWHP below 8500 rpm is a good compromise regarding performance and longevity.

I have a YZF 426 running around the dunes somewhere putting down high fifties on Methanol.

Without entering "top fuel" service intervals you are asking an awful lot regarding 90 RWHP.

Main bearing overload and crank flexing will be your likely areas of concern.

You can get the job done no doubt. Service intervals and proper ignition control via the SEM system would be my primary concerns.

Hope this helps without being discouraging.

Best Regards,
Dale
 
dale you seem to be the man on performance parts, i did look at all 30+ pages in here before i posted

lets say we want to run this ALL motor so we have better reliablility and preformance

what is a realisitic hp number for a 600 with a open exhaust, cam, porting, big carb

and do you have a cam available for this engine?

i havent looked hard at it yet. but are the cylinders plated?? is oem the only size piston and i have seen where you can get different pistons for more compression. but you have to watch you piston to valve clerance. I do clay check and clerance my 450s so that is within my skill level.
 
RPM is the primary limitation.

Maximum bore diameter for early engines is 97 mm. (plated)

To make 90 RWHP you need to produce 55 lb/ft of torque @ 8500 rpm.
(ie you need to move a bunch of air)

I do indeed offer performance camshafts, springs, valves, etc.

If you maximise airflow @ 8500 rpm and spray minimal Nitrous your 90 RWHP
figure is a reality. I am simply uncertain to the lifespan one may
realistically expect between overhauls.

If you are willing to roll the dice I am more than happy to advise.

For what it may be worth:
I believe such to be a realistic, albeit expensive project. I like expensive
providing it is not my money. :lol: LOL

Hope this helps.

Sincerely,
Dale

PS
A built 620 will produce 44 lb/ ft torque near 6500 rpm.
 
Why the cool reception toward cpcpatriot?
Personally, I say good for him, poor the juice to it and "Let's Get It On".

Dale
 
These engines don`t rev very high. I think the weak link would be the big end and crankshaft bearings. I would go through the engine first and see what needs doing. Also check with ( darn can`t remember) well anyway they make a 750cc Husaberg engine. That might be a better bet in the long run. There is a link to the site here somewhere. Somebody else chime in. Good luck and hope this helps.
 
thoose old air cooled 4 strokes are not light enough or high tech enough for me pernsonally

i have the question why not just do a cr 500. well they arent counterbalanced and they shake the heck out of the quad frames and break the engine mounts

i think this motor is on the original bearings. from what i can gather there are updated bearings for these motors??

i am looking into what i can do to make the motor strong enough to handle 20-30hp of nitrous. right now i plan to replace bearings and weld and true the crank if i do the project

i love 4 strokes and wanted the best engine to start with for a single cylinder.

JBS racing makes the 750cc motors
$6435 for a 2003 motor


dale you have a pm
 
The FC600 you just bought isn't counterbalanced and is noted as being quite a shaker. Other than that I can't add much, but good luck.
dan
 
I received the PM and shall be happy to help you.

"You are not the first to squirt a Husaberg Hill Climber"

I am rapidly approaching deadline on a very serious contract and will gladly address your questions once I have the free time.

Lately I have been living on a steady diet of Xanax, Caffeine and Prozac so be advised to give me a little room. :)

Dale
 

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