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Forum: 1986 - 2007 Ninja 250R Tech Talk

Yesterday, 01:23 AM

Replies: 32

NEW tires available in sizes for our 16" wheels?

Views: 6,534

Posted By petrolhead

I would only choose a tire for the grip it can...

I would only choose a tire for the grip it can provide. It's infinitely more important than the small weight differences. Motorcycles have very little grip, and one with street tyres has even less.

Forum: Ninjettes At Speed

September 14th, 2024, 01:38 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

Hi Feel free to dump any and all links here....

Hi
Feel free to dump any and all links here. And thanks.

Edit. I did the calculation with stock 108mm oil level. At 7cm of compression the air spring is only ¼ of the coil spring force. At 9cm...

Forum: Ninjettes At Speed

September 14th, 2024, 01:34 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

Thanks for your comment. Yes that's how gas...

Thanks for your comment.
Yes that's how gas pressure works. My difficulty was to calculate the initial air volume. 108mm oil level fully compresed doesn't translate to oil level 108+X when de...

Forum: Ninjettes At Speed

September 12th, 2024, 09:24 PM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

I've been trying to calculate the force of the...

I've been trying to calculate the force of the "air spring" in the forks. There's so many variables that I'm probably missing something, I got some wild numbers as result. I'll have to fill up a fork...

Forum: Ninjettes At Speed

September 9th, 2024, 10:39 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

YSS310 emulator is 0,4mm bigger than the tube...

YSS310 emulator is 0,4mm bigger than the tube internal diameter (~30,6mm). Also the lower part is 24mm whereas the piston's "cup" is only 23 where it's supposed to sit. So it takes some grinding to...

Forum: Ninjettes At Speed

September 8th, 2024, 10:12 PM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

While commenting on this I hadn t realized how...

While commenting on this I hadn t realized how rebound damping works in these. Apparently the seal at the bottom of inner tube acts as a check valve, allowing the underside of piston to fill up but...

Forum: Ninjettes At Speed

September 8th, 2024, 04:08 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

I'm a bit lost, again. I don't understand the...

I'm a bit lost, again. I don't understand the function of this hole. I've seen it called a rebound hole on some bikes but it doesn't compute. It's always open like the two bigger are, should allow...

Forum: Ninjettes At Speed

September 5th, 2024, 08:37 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

In that case there'd be more damping in...

In that case there'd be more damping in compression than in rebound which is kinda silly. I guess I could replace the lower soft spring with a stiffer one and limit it's range of opening.

Forum: Ninjettes At Speed

September 5th, 2024, 07:11 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

One idea. Drill lot more holes in the top plate...

One idea. Drill lot more holes in the top plate and put in a couple thin shims. Compression side would have more low/midspeed flow without affecting rebound. Would neccesitate a small additional...

Forum: Ninjettes At Speed

September 4th, 2024, 09:55 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

Now I'm confused. The shim that sits a top the...

Now I'm confused. The shim that sits a top the large spring is supposed to be the plate that opens in rebound, right? It's ten times softer than the narrow top spring. And rebound is supposed to do...

Forum: Ninjettes At Speed

August 30th, 2024, 10:06 PM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

Interesting mod that ^, thanks. People seem to...

Interesting mod that ^, thanks. People seem to report it works fine. Without comments, I'd be skeptical about moving the entire advance map by some degrees.

My solution for the exhaust mod was to...

Forum: Ninjettes At Speed

August 30th, 2024, 10:51 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

The welding won't be winning any prizes ar per....

The welding won't be winning any prizes ar per. Two different materials with different wall thicknesses and small difference in OD.
I went through the welds with pressurerized air and patched as...

Forum: Ninjettes At Speed

August 30th, 2024, 06:56 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

Cat delete, minus 200g plus 0,01hp.

Cat delete, minus 200g plus 0,01hp.

Forum: Ninjettes At Speed

August 28th, 2024, 12:28 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

Thanks for commenting. Thinking about it more, if...

Thanks for commenting. Thinking about it more, if one were to use shims.. maybe drill the compression side plate full of holes and stack shims on top of that. This is what I alwys do, trying to...

Forum: Ninjettes At Speed

August 25th, 2024, 08:56 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

I've been reading up on damping a bit. Am I...

I've been reading up on damping a bit. Am I thinking this correctly. If an emulator has a lot of preload on the top (compression) plate spring, that would make it very digressive? Then I've been...

Forum: Ninjettes At Speed

August 22nd, 2024, 12:59 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

On track photos ©Lumi Ollikainen.

On track photos ©Lumi Ollikainen.

Forum: Ninjettes At Speed

August 20th, 2024, 11:30 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

Alastaro video 08/2024

ObiMcY_Oh5Y

Forum: Ninjettes At Speed

August 18th, 2024, 11:39 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

At Alastaro racing circuit today for the first...

At Alastaro racing circuit today for the first time ever
. On the first stint chain broke and I had no spare. 2 riding sets lost because of that, me dashing to the nearest (not near) parts store to...

Forum: Ninjettes At Speed

August 17th, 2024, 08:03 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

I just spent an unreasonable amount of time...

I just spent an unreasonable amount of time bleeding the front brake/getting the softness out of it. I think I recognice the problem. With a solid caliper the pistons move only half of the distance...

Forum: Ninjettes At Speed

August 5th, 2024, 10:00 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

Thanks for this. I thought I might go back to...

Thanks for this. I thought I might go back to slicker oil once I get emulators that actually fit.
The bike actually is lowered perhaps 1cm from the front and close to stock (high) setting in the...

Forum: Ninjettes At Speed

August 5th, 2024, 08:07 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

Always to nice put on soft fresh(er) tyres. I...

Always to nice put on soft fresh(er) tyres. I changed the brake fluid and the lever pretty much bottoms out now. Zero chance of air in the system before anyone asks. It's just that the pad range of...

Forum: Ninjettes At Speed

August 2nd, 2024, 01:02 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

Potential problem with the emulators. Many...

Potential problem with the emulators. Many websites list the YSS 335 to be a fit. However the diameter of them is.. 33,5mm according to couple sources. They haven't arrived yet. Ninja's fork tube ID...

Forum: Ninjettes At Speed

August 1st, 2024, 08:28 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

Not going to win any prizes for the weld or paint...

Not going to win any prizes for the weld or paint finish, but two M8 nuts welded to the frame. Not exactly worried about resale value with this bike.

Forum: Ninjettes At Speed

July 31st, 2024, 11:13 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

Thanks for your comment, made me think about...

Thanks for your comment, made me think about stuff. The bike could do with perhaps less static and rider sag up front so that's one reason to increase preload a bit. If you increase preload by x mm...

Forum: Ninjettes At Speed

July 27th, 2024, 02:38 AM

Replies: 225

Track stuff from Finland

Views: 31,086

Posted By petrolhead

My first thought was to leave some margin, then...

My first thought was to leave some margin, then cut more if neccessary. The bike has no preload adjusters up front. Rider has complained couple times about excessive dive under braking. I'm not sure...

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