need for speed

Hey I have a 1982 yamaha xj650 maxim I'm painting her this probably next month and while she tore down I want make her faster I was thinking of turboing her but I don't know is the a better way to make her faster end result I want to make my baby fast lol

 

Faster?
My 81 XJ650 is already a rocket sled in stock condition.
Or maybe I'm old. . . . but when I hit that power band RPM range - it's like
weeeeeeeeehooooooooooo!

 

There is no inexpensive way to do what you want. Enjoy it as-is and save up for a track-day bike if you want to go faster.

Having said that: It has been done.

http://www.xjbikes.com/forums/index.php?threads/my-82-xj750-project-shadow-warrior.35431/

http://xjbikes.com/forums/index.php?threads/pics-and-video-of-finished-turbo-maxim-turbomax.44449/

 

a lot of bikes are faster, just buy one. that's the easiest way

 

Put a turbo on it spend a lot of money if thats what you want. Or just go out by a newer 600 will be faster then your 650 will ever be with a turbo. Your dealing with old tech bikes here with 2 valves per cyl and air cooling.

 

If you like your 650 Maxim but want more speed, check your local listings for a water-cooled 750 MaximX. Or just get the engine and swap it into your frame if you prefer the home-grown approach. Here's how I did it: http://www.xjbikes.com/forums/index...gine-into-a-650-seca-frame.42248/#post-372423
It isn't easy, but probably easier than a turbo. There are no turbo kits available for these bikes so you'd be fabricating a lot of parts yourself.

 

With a 650 Maxim I'd be upgrading the brakes a long time before I made it go any faster. The stock brakes, no matter how new or well maintained, are not up to the job.

As for turbo charging, there was a factory turbo 650, I'd get one of them and borrow the parts needed (essentially most of it).

 

you can't turbo a carb engine. the compression ratio is too high and the cam profiles and timing are different.

FU

 

Turbochargers have been used on carburated engines since the first day that turbos were invented (1905). Cams can be swapped, compression ratios can be reduced (when needed). Even so this will be a money pit if he does it. But then some things should be done just for the fun of doing them, even if the results are less than spectacular.

 

what I was saying is that a stock carb engine will not accept a turbo. compression ratios are too high and blady blah. you cannot simply bolt a turbo on and go.

FU

 

Cams are different, heads are different, jugs are different (detonation sensor port), block is different (oil supply port for turbo), oil pan is different (oil return line), oil pump is different (to scavenge the oil return line's contents), gears are different (heavier duty and different ratios), valvecover is different (the 650T is a YICS engine, but it still used the older non-yics style gasket and thus cover and cam bearing caps are different, too).


Worst bet: complete turbo engine, driveshaft (yes it's heavier-duty, too), swingarm (extra reinforcement gussets on that puppy), carbs, airbox, surge tank, TCI, and of course all the frame mods needed to get things to fit. Oh yeah, the turbo and ALL related plumbing.....and there's quite a bit of it. Don't forget the special exhaust manifold, which means don't forget the special headpipes and mufflers, too. Best pickup a complete wire harness and gauge module, too.

Best bet: buy a complete turbo bike. Then you can have a turbocharged XJ650 without the gazillion headaches and expenses.

 

That's pretty much what I was getting at. It's probably easier to just put the Maxim tank and panels etc. on the turbo bike

 

Thanks guys a lot of good info I'll let u know what I decide to do I think I like the 750 water cooled idea I have to look around

 

As far as the power band goes what's the best rpms for the different gears to shift at maybe I'm just shifting to high or to low

 

Power comes on at 6k and does not drop off until after redline (but don't go past there on a regular basis).

 

So don't shift till 6k?

 

Depending on how 'tuned' your bike is - 6K +/- 500 (or so).

Go into the higher RPM's and you will feel that baby KICK and start running like an ape that has been violated . . . . that is your power band range.
Like Kmoe said - she stays there until you go past red.

P.S> - make sure you are holding on!

 

Where you shift all depends on what you're doing. A comfortable ride through the countryside, or a long trip where fuel economy is important, then shift at around 4k. Out for a little fun then shift anywhere above 6k that you care to (I usually shift at around 8k when needing to acleerate hard).

 

OK I had a buddy ride my bike and tell me he got more power out of the lower rpms so I'll have to try that thanks guys

 

To anyone intrested in speed and going fast:

There are some very good rider training courses that will teach riders how to corner better and have 100% control

i have learned alot, and need more training yet!! (only did basic class)

safety is the highest priority, and the more you know how to do the better your odds.

track and drag racers have had alot of training on how to do that safely, if your intrested in that then please pursue the rider training.

yes, you can "learn on the street" but you will make some very expencive mistakes,

the average "minor" road rash hospital visit will (without ambulance) cost around $10,000.

20% body road rash + ambulance ride runs a minimim of $80,000.

let's not even talk about a car impact while "street racing" broken bones, surguries, If you lived that is.....

rider training classes cost $300-$15,000 (high end training with track time video recording playback for technique training)

and you'll be a good "safer" racer because of it.

hmm. cheap compared to the hospital.

everyone could improve they're riding technique with a training course, and i believe it's money well spent.

sorry end of sermon..

Ride Safe!