Gozer's RZ250R

g0zer · 23-05-2008, 07:51 PM

have to pick it up tomorrow, sean couldnt stay sober for long enough fri night to do a handover

sandman · 24-05-2008, 10:05 AM

Yeah I had a course all week and required beer stat!

Sold! Dave picked her up this morning

Hope all is well and you got home safe bro.

g0zer · 24-05-2008, 04:07 PM

thanks man, yeah no problems. took it home, dumped the brake fluid and the 2stroke oil cleaned all your white gunk off the chain and took it for a ride in the hills.

the bike is wicked, nice and smooth

All i could see in my mirrors for a while was a deep blue fog lmao! By the time i came out of the hills it had come good- couldnt see any smoke at all

how fast are these things meant to go? 5th and 6th gear are a complete waste of time as far as i can tell, it tops out around 130kmh is that right for these things?

Sean'o · 24-05-2008, 05:31 PM

you should be able to get around 170 out of it.

ritza350 · 25-05-2008, 06:42 AM

it should wind up to bout 170 on the speedo

although in the blurb they say a true 160, to get the best top end you have to wring its neck to almost red line in each gear

then it will come grasshopper

. this is a sweet little bike, it rode well a year ago

g0zer · 25-05-2008, 07:42 AM

Quote:

Originally Posted by ritza350

it should wind up to bout 170 on the speedo

although in the blurb they say a true 160, to get the best top end you have to wring its neck to almost red line in each gear

then it will come grasshopper

. this is a sweet little bike, it rode well a year ago

i have been ringing it.. redline is 10,000RPM, it doesnt seem to pull past 11,000 :p

ok definately something is up.. holding WFO in 4th and tucking in you will run out of road before it climbs past 130kmh and if you try clicking 5th (at 9,000-10,000 rpm) it will lose speed.

i will start by pulling the filters and exhaust. any suggestions welcome

sathid · 25-05-2008, 09:42 AM

new plugs?

check the jetting perhaps?

g0zer · 25-05-2008, 10:34 AM

Quote:

Originally Posted by sathid

new plugs?

check the jetting perhaps?

what do you mean check the jetting sathid? you mean pull the carbs off and make sure they arent gunked up?

hmm wheres nath's number...

Jamathi · 25-05-2008, 10:58 AM

New set of rings?
First have a look at the needle setting in Carbs and if the jets are correct and clean.
secondly have a look at the ignition and correct grade of Sparkies.
next check the sparkleads and cap.
Airfilter??
Also check the fuel line and fuel tap for blockages/obstructions on fuel flow.
If that is all good, then a compression test will tell you if the rings need a freshingup session.

sathid · 25-05-2008, 04:28 PM

What rpm are you getting to in top?

Is it running standard sprockets?

Really, you just want to buy a Zeeltronic ignition

g0zer · 25-05-2008, 04:52 PM

Quote:

Originally Posted by Jamathi

New set of rings?
First have a look at the needle setting in Carbs and if the jets are correct and clean.
secondly have a look at the ignition and correct grade of Sparkies.
next check the sparkleads and cap.
Airfilter??
Also check the fuel line and fuel tap for blockages/obstructions on fuel flow.
If that is all good, then a compression test will tell you if the rings need a freshingup session.

hehe i was hoping you would chime in Jamathi

i pulled the spark plugs, the arcing (inside) surfaces apart from a slight tarnish they are clean. they are marked NGK B9ES. this bike has umm capaciter discharge ignition black box.

i pulled the air filter, it is foam type and had been treated with some really tacky blue goo like chain lube. took me 5 rinses with preen the great unstainer to clean it all out, it has a light coating of KN filter oil now.

i pulled the boots of the carbs, butterflies werent opening/closing at the same time so i corrected that. i dont have the carb syncing doodad so until i get one i guess i am wasting my time going any futher with the carbs. i will buy the compression testing tool at the same time and check that as well.

fuel flow from the stop cock is good.

took it for a rap.

The bike has a real hard ring ting ning sound now. the bike pulls to about 120 then crawls to 150 which is an improvement.

i also pulled the exhausts and degreased the internals.

now ive cleaned up the exhausts and thrashed crap out of it, i do not see any smoke coming out the back WFO and redline, apart from a little smoke on start up there is no smoke. i have read that high fuel oil ratios can cause loss in power and wonder if this is my problem? What is the adjustment philosophy/ MO on adjusting the fuel oil mix?

i think the reed valves are fluttering off throttle though, is this normal? i checked what i guess is the adjustment, there is a notched tab and a hole which the notch lines up with.

re: sathid
RPM in top? cannot make it into 6th, if you arent redline in 4th when you shift into 5th it wont pull in 5th either. the bike revs freely in the lower gears to 12000RPM (which is 2000 past redline).

i got the feeling after taking it out today, that the bike actually loses power at WOT. For instance if i am in 4th and whack it open 75% it pulls ok but if i open it to 100% i get the feeling it starts to bog a little.

finally i noticed if you hit bumps at over 100kmh when banked over the front gets a nice wobble which doesnt go away until you lift the bike back up. sometimes it does it just adjusting line.. hehehe

final notes:

people on big bikes dont respect the 250 at all.

i got buzzed by some dude on a beater gixxer 1100 in the hills (if he is on the forum and wondering why i jumped on the brakes (sorry about that) and pulled over its cos a big bug somehow came inside my helmst and smacked me in the eye)

some dude on a harley and another dude on a zx14 all buzzed me as well.. close flybys

sathid · 25-05-2008, 05:13 PM

If you like your crank, avoid 12000rpm...

Try some BR9ES plugs. Or possibly even check the pv's to make sure they open properly, and together. Sounds like the motor is hitting a brick wall...

g0zer · 25-05-2008, 05:24 PM

Quote:

Originally Posted by sathid

If you like your crank, avoid 12000rpm...

Try some BR9ES plugs. Or possibly even check the pv's to make sure they open properly, and together. Sounds like the motor is hitting a brick wall...

i will do that, i actually meant to check PV operation but forgot about it.

the motor pulls smoothly and its a quiet motor, i think its down on power though.. feels like a VTR 250 or even a hyosung 250- cannot push through wind at all.

I might give it to Nath to take for a rap so he can compare with his.

from an R1 to a 250 its kind of hard for me to judge power apart from winding the thing out and seeing where it tops out.

thro · 25-05-2008, 05:39 PM

My vote is the fuelling is out somehow.

Pull the carbs apart and check they're all ok.

If you're losing power when winding the throttle fully open - what could be happening is that your throttle blades are letting more air in (good) but without the matching increase in fuel, you're going to run lean (bad).

Definitely sounds like its down on power, obviously i'm comparing to an RGV, but mine pulls 140-150 with relative ease, and i've had 180 out of it with more left.

From memory tho, those RZ250s are supposed to have 50 hp? So it should certainly be quicker than a VTR or Hyo...

nath · 25-05-2008, 05:41 PM

Got a spare pair of plugs if you want to try them.

Bring it round and we'll swap bikes and go for a spin.

g0zer · 25-05-2008, 05:47 PM

Quote:

Originally Posted by thro

My vote is the fuelling is out somehow.

Pull the carbs apart and check they're all ok.

Definitely sounds like its down on power, obviously i'm comparing to an RGV, but mine pulls 140-150 with relative ease, and i've had 180 out of it with more left.

ive ridden a couple of RGV's, this bike is MUCH weaker than an RGV

i am thinking its fueling too. you know when a 2 stroke comes on song it just pulls abruptly and is happy. This motor wants to do that, it comes on song nicely but is not right.

It shows up as you click into the higher gears, the powerband which is nice and wide 6500 - 10000RPM in 1st 2nd and 3rd, becomes 8000-9750 in 4th and then 8500-9250 in 5th.

g0zer · 25-05-2008, 05:47 PM

will call you in 5 minutes nath

nath · 25-05-2008, 05:56 PM

I'll warm the bike up then

Sean'o · 25-05-2008, 06:03 PM

Check your gearing to, when i bought mine years ago, someone in their infinite wisdom had fitted a one tooth larger front sprocket, the thing would not rev out in top gear and would only do about 130. I fitted a 1 tooth smaller front, would hit an indicated 175-180 after that and had no problems redlining in 6th. They arent a hugely powerful motor and being a 2 stroke, if everything is not perfect it doesnt take much to loose hp.
Get someone to set the carbies up properly, fit new plugs, check/clean power valves, check your oil pump for correct amout of movement, probably never been done so the thing will be running rich on oil, repack your mufflers, yeah i know it sounds silly but it makes a difference on 2 strokes, better still find a set of lectron carbs and a set of micron pipes for it, that will liven the old girl up a bit

As far as the wobble goes, sounds like you should have it checked for straight and then have suspension serviced, marty moose would be the man to see for that.

thro · 25-05-2008, 06:21 PM

^^ gearing should still enable him to get better than 120-130 in say, 3rd tho?