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Old July 17th, 2023, 10:23 AM   #161
petrolhead
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Note to myself. 27 laps around Pesämäki is 4,5 liters of 98E5 gasoline, 38 laps is ~6,5 liters. Including warming up the thing in the morning, outlaps and inlaps.
With bit less an a liter in the tank works fine.
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Old July 19th, 2023, 12:06 AM   #162
petrolhead
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I ordered this, hasn't arrived. Interested in how that changes things.
Thinking of ways to make the thing faster. The more speed I can coax out of it, the further I can delay getting a 600. There's the muffler bracket v. 1.1
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Old July 19th, 2023, 05:11 PM   #163
DannoXYZ
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MOTY - 2018, MOTM - Nov '17
Are you allowed engine upgrades?

Very, very easy to install 300 crank with ZX-6R pistons... Now we're talking 45bhp... Same as Ninja 400... very, very fast... with 150kg bike...
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Old July 19th, 2023, 09:28 PM   #164
petrolhead
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Quote:
Originally Posted by DannoXYZ View Post
Are you allowed engine upgrades?

Very, very easy to install 300 crank with ZX-6R pistons... Now we're talking 45bhp... Same as Ninja 400... very, very fast... with 150kg bike...
Yes, I have some moderate plans for the engine, now I have a spare one to build. Suspension is next, and that will probably cost a pretty penny.
I'm not looking to go crazy with the engine when/if that time comes. I think higher compression ratio and retarding the intake cam could be workable stage 1 solutions. Maybe come up with some sort of header without the H pipe.

Last futzed with by petrolhead; July 19th, 2023 at 10:51 PM.
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Old July 20th, 2023, 11:20 AM   #165
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There it sits. Installation itself is simple enough. The instruction talks about bluetooth connection which I spent a lot of time trying to establish. Until it turned out this is a Wifi model, yay. I finally got it working on the stands.

For future fiddling, the set could lose about 2 metres of wiring if integrated to the bike's harness properly.
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Last futzed with by petrolhead; July 20th, 2023 at 01:04 PM.
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Old July 20th, 2023, 11:39 PM   #166
petrolhead
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Quote:
Originally Posted by DannoXYZ View Post
Are you allowed engine upgrades?

Very, very easy to install 300 crank with ZX-6R pistons... Now we're talking 45bhp... Same as Ninja 400... very, very fast... with 150kg bike...
Just for starters, I haven't even gotten around to delete the cat from the pipe. There could be 0,07 hp there plus more problems with noise limits.
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Old July 22nd, 2023, 01:07 AM   #167
petrolhead
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Quote:
Originally Posted by petrolhead View Post
Note to myself. 27 laps around Pesämäki is 4,5 liters of 98E5 gasoline, 38 laps is ~6,5 liters. Including warming up the thing in the morning, outlaps and inlaps.
With bit less an a liter in the tank works fine.
Answering myself. 16 timed laps around Ahvenisto is 4 liters of fuel with outlaps inlaps and warm up plus noise check.

Currently at Ahvenisto track doing setup for the shifter and apparently chasing a ZX-10R.

Once I got the cut time and sensor threshold adjusted, rider reported that the quick shifter improves things. 30% seemed good, bike vibration alone causes 8-10% signal. 95 milliseconds worked, 85ms caused a jerk he told me.

Again, lap time much improved from last time.

Link to original page on YouTube.


Last futzed with by Alex; August 3rd, 2023 at 01:11 PM. Reason: Fixed youtube link. Just put the video ID between the youtube tags, not the whole URL.
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Old July 23rd, 2023, 11:07 AM   #168
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Current specs

Recap of the current specs:
- race fairings, DIY foam seat from a camping mattress
-Michelin Power Cup evos(110 & 140), Bstone R11 mediums in storage
-13/47 sprockets (14,15, 43,46,48 in storage)
- ~0,5kg Unibat ULT 1 battery
-1,5kg DIY muffler v 2.0
-0,19kg titanium muffler bracket
-DIY rear sets
-tank grips
-some cheap clip ons with soft Renthal grips
-Front brake Brembo P30/34 caliper, stock disc
-Braking 16mm radial master cylinder
- ~8% quicker throttle
-about 137kg with 3 liters of fuel. Nonessential wiring and most brackets deleted. Kickstand, its bracket and aux parts deleted. Back part of frame cut, replaced with lighter tubing.
-Stock suspension, bit thicker oil in forks.
-Rear wheel pushed as far forward as it can fit.
-Ignition lock deleted
-Replacement engine, supposedly was ridden 9800km when bought.
-Healtech IQSE W quick shifter
-Racechrono pro, Garmin Glo GPS.

Last futzed with by petrolhead; July 23rd, 2023 at 11:11 PM.
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Old July 25th, 2023, 11:06 AM   #169
superkain
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We tried to go to Kymiring last year for MotoGP. Bummer it got cancelled, but good to se you are getting after it!
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Old July 25th, 2023, 11:09 AM   #170
petrolhead
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Quote:
Originally Posted by superkain View Post
We tried to go to Kymiring last year for MotoGP. Bummer it got cancelled, but good to se you are getting after it!
Until someone builds 50 million worth of facilities in there, there won't be world championship races.

Rear tyre warmer was suspect. Bit of re wiring and half an hour of sewing, done. Heats up quickly a spare tyre I tested.
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Old August 1st, 2023, 09:16 AM   #171
petrolhead
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I bought a used GSXR 600 rear shock. See what happens then that arrives. Wasn't expensive.
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Old August 2nd, 2023, 10:57 AM   #172
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The service manuals for 250R and 300 list exactly the same degrees, timing and height for both cams. Am I correct to assume they're the same between models?

Last futzed with by petrolhead; August 3rd, 2023 at 09:13 PM.
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Old August 7th, 2023, 06:51 AM   #173
petrolhead
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Being the safety-Sally that I am, I noticed that the current suits hip armours were very thin and flimsy. I sewed on thicker ones I had left over from some Alpinestars gear. Rider said they're unnoticeable when riding. Quite a hassle to sew them between the leather and inner lining.

Yesterday we were at Motopark. The shifter wouldn't co-operate. The bike does 157km/h and no more. The track has a 4th gear corner exit followed by 1000 metres flat out. That really reveals small bike's limitations. Most tracks in Finland are twistier.

Camera mount **** the bed so I'm not sure if anything is uploadable. Best time was 2:03 which I think is OK this being his first time there. Mid day I changed 47 to 46T rear sprocket, he was pretty close to limiter in 6th.

Last futzed with by petrolhead; August 18th, 2023 at 07:12 AM.
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Old August 9th, 2023, 12:31 PM   #174
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I just realized I'll have to cut/modify the airbox to make room for the shock.. oh well.
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Old August 12th, 2023, 11:41 PM   #175
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Quote:
Originally Posted by petrolhead View Post
I just realized I'll have to cut/modify the airbox to make room for the shock.. oh well.
I'm contemplating on modifying the upper shock mounting point. Maybe weld shut the holes and re drilling a 10mm holes a bit lower. That would help with the shock being shorter. I don't want to bring it higher by adding preload. Internet tells me both GSXR and 250R springs are about 9kg/cm. The rear is currently too stiff, because of shortened wheel base and a light rider.
Also lowered mounting would lessen the need to cut the airbox. I'm a firm believer in airboxes, plenums and such.

Unedited random clip from Motopark without data. His fastest lap isn't on that video.
https://youtu.be/0MI19IpeTfs

Last futzed with by petrolhead; August 13th, 2023 at 03:15 AM.
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Old August 17th, 2023, 07:21 AM   #176
petrolhead
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Note to myself. The GSXR spring is 213mm , 64mm ID, 87ish mm OD.

Last futzed with by petrolhead; August 17th, 2023 at 08:48 AM.
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Old August 18th, 2023, 10:18 AM   #177
petrolhead
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Does anyone know of a cheap spring for the gixxer shock? K-tech makes them , 64-210-XX but there must be cheaper alternatives than 120€ for a piece of wound steel wire. I'm looking for a ~8kg/mm spring. That'd be about 450lb/in.

20th Aug edit.. We got the shifter working. I'd previously tried to shorten the cut delay which made things worse for some odd reason. Now, I lengthened the delay to 25ms with 110ms cut time and seems to work perfectly. Go figure.

Some shaky footage from today. New personal best lap, which is number 31.
https://youtube.com/watch?v=7QzdP3q1AkI&feature=share9

Last futzed with by petrolhead; August 21st, 2023 at 09:28 PM.
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Old August 22nd, 2023, 12:18 PM   #178
petrolhead
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I ended up ordering the K-tech 64-210-80 spring. Once that arrives I'll post some pics of the shock project.
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Old August 23rd, 2023, 07:00 AM   #179
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I may have just broken my femur watching that video!! Those walls!!!!
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Old August 23rd, 2023, 10:45 PM   #180
petrolhead
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Quote:
Originally Posted by bruce71198 View Post
I may have just broken my femur watching that video!! Those walls!!!!
Yeah, it's a small track made in an old sand pit. Top speeds are 115km/h so mayde it's not too dangerous. The rider goes his maximum minus some margin. He doesn't need to ride 10/10, not practicing for racing. Still he makes some progress over time.


The shock lower end was a pain in the ass to disassemble without instructions. Took a lot of soaking, hammering and an induction heater to break a part the aluminium piece and spring plate. Difficulty being that they couldn't be removed from between other parts before broken apart. Here rust removed and painted with the first primer and color that were on the shelf.
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Last futzed with by petrolhead; September 12th, 2023 at 11:35 AM.
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Old August 24th, 2023, 06:11 AM   #181
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That's all the oil that came out. Surprisingly little?
Different sources recommend different oil so I decided to try this one:
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File Type: jpg 20230824_182400.jpg (66.4 KB, 0 views)

Last futzed with by petrolhead; August 31st, 2023 at 02:10 AM.
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Old August 25th, 2023, 07:27 AM   #182
petrolhead
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A very special tool for filling oil/getting rid of air. A cut bottle with rubber glove fingers as sealing. I rotated the compression valve thing all the way to open position and kept it under oil til I screwed it on. 30Nm tightness. It was less than 25Nm on in the beginning. The shock had 4 bar pressure when I got it. I filled now to 10,5 bar nitrogen, see how that works. GSX-R service manual doesn't give any value for it.
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Last futzed with by petrolhead; August 27th, 2023 at 01:33 AM.
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Old September 12th, 2023, 01:44 AM   #183
petrolhead
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I ordered the softer K-tech spring. Been on it's way from England for close to three weeks.

Dont try this at home. I tried to measure how much the new/old spring compress under equal force. Didnt get any intelligible numbers. Seemed like there's not much difference between them.
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Last futzed with by petrolhead; September 16th, 2023 at 04:48 AM.
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