In the riders seat
Yes it is, at one stage one of the fastest bikes down here in the pre FXR era and quicker than the SS90 GN (wouldn't be to hard as he rides like an old lady)Originally Posted by TZ350
won the 2001 championship (before I owned it) and second the two years (02-03) after that with me riding it to the filthy two stroke ridden by Diesel pig who said he could only beat the GN because of the extra HP he had
GSXR250 front end
GSXR250 swingarm (took a lot of modifying to make it fit)
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough power."
Forum whore
Two words spring to mind..... TART's, and HANDBAG
Forum whore
actualy I think it looks a lot better than I thought
I was thinking it would look more like the 2 smoker you had there
second the two years (02-03) after that with me riding it to the filthy two stroke ridden by Diesel pig who said he could only beat the GN because of the extra HP he had
was sort of the reason we went 2 stroke
"Instructions are just the manufacturers opinion on how to install it" Tim Taylor of "Tool Time"
“Saying what we think gives us a wider conversational range than saying what we know.” - Cullen Hightower
Bucket Racer/Crasher
Finally got up to John's and spent a few hours filling his workshop with 2-stroke smoke. The end result with the new pipe was a very similar power curve to the final run from the previous dyno session where I had the laser cut Wobbly pipe hanging out the side of the bike. We got another 1/2hp out of it with a bit of fiddling and it looks like a bit more there with a smaller main jet. We can also lift the curve across the top by fiddling with air correction jets, maybe.
One of the things we tried was the different size nozzles on the pipe. I had been running a 20mm nozzle and tried the 19mm nozzle at the track last time. It felt better and I liked it. I wasn't expecting anything in particular so that was a pretty honest feeling that it was better. Well, on the dyno the 19mm nozzle only had one effect and that was to knock the power on the head, just a little bit. The 20mm nozzle worked better. We will revisit that a bit later.
We've set the timing a bit advanced from best peak power as it gives a good lift as the motor comes up on power with a pretty useful 1/2-1hp everywhere except peak. Pretty obvious I need one of those programmable CDIs.
On the carb side it 4-strokes at any small throttle settings at nearly any revs. Give it a bit of throttle and it cleans up immediately. Next time at the track I'll drop the needle a notch. I may have to have a look at the carb slide but I'm not too worried as it carburates well as it is when used as intended. I was able to go to full throttle on the dyno at not much more than a fast idle.
Dyno runs were done in 4th gear with a top speed of about 100kmh. The curve builds nicely and then flattens off for a good 30kmh. Over that range it's a straight line and nearly flat.
The peak we got was 21.4hp so still more to go to match old #6 but not too bad. I'm also going to play with the reed free length as this motor revs on & on and the reeds may be a bit long for the revs, resonance and all that.
Forum whore
What is this 'nozzle' you referring to? Stinger maybe?
Nice HP, any chance of seeing a run sheet? From memory JC's dyno didn't offer that but a smart guy such as yourself could use the data to hand draw a graph.
Bucket Racer/Crasher
Been fiddling a bit more. This time I just want to test the new 34mm carb on something I'm familiar with. I've got a whole carb/cable/throttle setup for each carb so real quick and easy to swap. The power jet feed tube snapped when I was trying to refit it so I have to fit another tube. Other than that I've glued a choke button from another Mikuni carb into it, tipped some fuel into it and gave it a push. I'd gone about 4 steps and it was running at a fast idle. Throttle response seems as good as the old 32mm but we'll see this weekend. If this all works fine the next step is fitting the other barrel and head with radiator.
Bucket Racer/Crasher
Bit more playing round has seen a dummy assembly of the good motor. The radiator is just hanging on a bit of alloy wire at the moment but the mounting lugs for the original radiator are in exactly the right place. Mitre10 don't know it but they have a really good stock of bucket racer watercooling copper pipes of various angles. I love this big chassis, plenty of room to just fit things in. I'm gonna give the RG50 radiator a go, it'll be obvious enough if it isn't up for the job.
Scooter boy
i think the motor is way too big for that chassis!, head looks great, did you weld it up yourself?
Forum whore
.
Team ESE are watching the development of this engine with interest..............
Many thanks for your help with our own FZR projects............
Bucket Racer/Crasher
I cut and turned up all the bits and dropped it off at Darren's workshop for welding. When I picked it up someone had replaced the circumference bit with a piece of treadplate. They're a bunch of comedians.
Forum whore
Yep............They're a bunch of comedians..........I wounder why it had treadplate on it..................
No8 Wire Extraordinaire
Yeah treadplate & spring washers. It's a bucket, I love it!
Looks room in the first pic to put your legs either side of the engine for some Fred Flintstone Power Assist.
Don't you look at my accountant.
He's the only one I've got.
Bucket Racer/Crasher
Couldn't help myself today. Have got the "good" engine all together now but the radiator is just hanging there. After working most of the day round the house I just had to start it. Same old 4 paces and it was running. I've fitted the 32mm roundslide Mikuni for the time being to reduce variables and it sounds crisp. One little leak of water from the head so there'll be a warranty claim going in to Morgan's this week.
Got a small collection of cardboard boxes now. Had to juggle base gasket thickness to get the squish clearance right.
The thermosyphon thing seems to be working. It warmed up the top of the radiator, but we'll see once I start riding it properly. Need to sort out a temp gauge yet.
No8 Wire Extraordinaire
Ahh Devcon will plug it. Temp gauges. Hmm. Great idea, Darrin ran one for years, but I've been through several & all have stopped working for some reason or other.
Don't you look at my accountant.
He's the only one I've got.
Bucket Racer/Crasher
All together and doesn't seem to be leaking. Warmed it up with a piece of clear plastic tube on the radiator cap overflow pipe and it pushed about 50mm up. With the bracket extending back to the frameand solidly mounted I think it's killed a lot of the vibration it had so it had the effect i thought it would.
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