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Forum: 2008 - 2012 Ninja 250R Tech Talk Yesterday, 02:03 PM
Replies: 16
Views: 164
Posted By DannoXYZ
Also, statistically... 1/2 of people are below...

Also, statistically... 1/2 of people are below average...
Gotta devise your rules to cover unimaginable things they'll do...
Forum: 2008 - 2012 Ninja 250R Tech Talk Yesterday, 01:59 PM
Replies: 16
Views: 164
Posted By DannoXYZ
Yes, you want to increase scope of your safety...

Yes, you want to increase scope of your safety envelope. Not just focus on specific builds in isolation. Many unexpected things can happen at track when all bikes are considered.

Racing orgs. have...
Forum: New Members Yesterday, 01:48 PM
Replies: 3
Views: 22
Posted By DannoXYZ
Greetings & Salutations!!! :wave: I just...

Greetings & Salutations!!! :wave:

I just moved from Bay Area to Mesa, AZ !!!
Forum: 1986 - 2007 Ninja 250R Tech Talk Yesterday, 09:37 AM
Replies: 61
Views: 1,683
Posted By DannoXYZ
EX500 engine swap... Same effort as 300 for...

EX500 engine swap... Same effort as 300 for double power ~60bhp.
No trial & error carb-tuning needed since EX500 carbs are already oprimised for that engine.
Forum: Items Wanted Yesterday, 07:43 AM
Replies: 9
Views: 180
Posted By DannoXYZ
There's reason for this tight fit in factory...

There's reason for this tight fit in factory configuration. They had top of fork-tube protruding above fork-clamp with handlebar wrapping over it so that loads are not carried by bolts. Specifically...
Forum: General Motorcycling Discussion Yesterday, 01:25 AM
Replies: 46
Views: 757
Posted By DannoXYZ
not really. I'll work up some pictures for you to...

not really. I'll work up some pictures for you to verify if I understand you correct.

Also with 1:3 rocker ratio, 2" travel on shock is 6" range on swingarm!
Forum: General Motorcycling Discussion May 15th, 2022, 04:12 PM
Replies: 46
Views: 757
Posted By DannoXYZ
Bob, don't quite understand your "bottomed out...

Bob, don't quite understand your "bottomed out shock" idea. Please post photos of shock:

1. Bare shock with no spring, showing all adjustment threads. With ruler showing eyelet-to-eyelet length
...
Forum: 2008 - 2012 Ninja 250R Tech Talk May 15th, 2022, 01:53 PM
Replies: 16
Views: 164
Posted By DannoXYZ
You're most welcome! :wave: A lot of clips...

You're most welcome! :wave:

A lot of clips are installed improperly. There are actually 4 different orientations of ML clip, not just 2. Most people know about facing open-end backwards. But don't...
Forum: 2008 - 2012 Ninja 250R Tech Talk May 15th, 2022, 09:48 AM
Replies: 16
Views: 164
Posted By DannoXYZ
Race bikes gets lots of maintenance and upgrades....

Race bikes gets lots of maintenance and upgrades. Lots of disassembly and re-assembly. There's a certain amount of worn-out fasteners and lack of torque-wrench usage involved. Safety wire is 2ndary...
Forum: General Motorcycling Discussion May 13th, 2022, 07:50 PM
Replies: 46
Views: 757
Posted By DannoXYZ
use some calipers to measure wire-diameter on...

use some calipers to measure wire-diameter on spring. We can make some good guesses as to alloy used and calculate spring-rate.

Also measure gap between coils at tightly-wound end.
Forum: General Motorcycling Discussion May 13th, 2022, 04:49 PM
Replies: 46
Views: 757
Posted By DannoXYZ
The rocker's leverage-ratio seems a little...

The rocker's leverage-ratio seems a little extreme.

N250 pre-gen = 1:1.5
N250 new-gen = 1:2.2
RX4 = 1:3 ?

It's already taking an extremely stiff dual-rate spring and multiplying it by 300% !!!
Forum: General Motorcycling Discussion May 13th, 2022, 03:46 PM
Replies: 46
Views: 757
Posted By DannoXYZ
Sorry, I'm using "preload" incorrectly. Should...

Sorry, I'm using "preload" incorrectly. Should say "sag" instead since that's what we want. Some amount of compression with no load on bike. Apparently RaceTech spring is still too stiff to allow any...
Forum: General Motorcycling Discussion May 13th, 2022, 01:11 PM
Replies: 46
Views: 757
Posted By DannoXYZ
Well, there's your problem. Factory spring is...

Well, there's your problem. Factory spring is dual-rate design. Probably starts at about 300-lb/in. Then after 1-2" of compression or so, it switches to 600-lbs/in (8 active coils go down to 4)....
Forum: New Members May 13th, 2022, 10:35 AM
Replies: 5
Views: 97
Posted By DannoXYZ
Are you going to use it for racing? Or convert...

Are you going to use it for racing? Or convert back to street bike?
Forum: New Members May 11th, 2022, 09:01 AM
Replies: 5
Views: 97
Posted By DannoXYZ
greetings & salutations!!! :wave:

greetings & salutations!!! :wave:
Forum: General Motorcycling Discussion May 10th, 2022, 02:57 PM
Replies: 5
Views: 131
Posted By DannoXYZ
Yeah, any amount of ethanol is bad for carb...

Yeah, any amount of ethanol is bad for carb bikes. Due to vented tank and carbs, moisture sneaks in from outside and causes separation of ethanol from gasoline.

On EFI bikes, not that big a deal...
Forum: 1986 - 2007 Ninja 250R Farkles May 9th, 2022, 06:11 PM
Replies: 8
Views: 7,248
Posted By DannoXYZ
Cut out frame of Ninja where it interferes and...

Cut out frame of Ninja where it interferes and weld in loop of tubing that bows downwards. Some people have done this to fit new-gen tanks onto pre-gen frames.
Forum: Ninjettes At Speed May 8th, 2022, 09:37 PM
Replies: 46
Views: 2,045
Posted By DannoXYZ
nope. Working thermostat is fully open well...

nope. Working thermostat is fully open well before operating temps is reached.

But on pre-gen; you should install ThermoBob.
Forum: 2008 - 2012 Ninja 250R Tech Talk May 8th, 2022, 09:34 PM
Replies: 1,725
Views: 148,992
Posted By DannoXYZ
The Ecotrons ECU randomly loses its memory and...

The Ecotrons ECU randomly loses its memory and settings. Have to reload the files to restore functionality. Search for other's reports, you're not 1st or only one with this issue.
Forum: General Motorcycling Discussion May 8th, 2022, 09:32 PM
Replies: 46
Views: 757
Posted By DannoXYZ
Again, move swingarm up & down with no shock...

Again, move swingarm up & down with no shock installed.
And measure actual spring-rate of factory spring along with one you got from RaceTech.


Post photos of OEM and RaceTech spring...
Forum: New Members May 7th, 2022, 08:15 PM
Replies: 4
Views: 129
Posted By DannoXYZ
Greetings and Salutations!! :wave:

Greetings and Salutations!! :wave:
Forum: General Motorcycling Discussion May 7th, 2022, 08:01 PM
Replies: 46
Views: 757
Posted By DannoXYZ
Eh? I thought you said you greased everything on...

Eh? I thought you said you greased everything on 4-May???

If you can't tighten bolt without locking up suspension, that's very poor design. Take look at how Ninja 250's swingarm and shock-linkages...
Forum: Ninjettes At Speed May 5th, 2022, 01:16 PM
Replies: 46
Views: 2,045
Posted By DannoXYZ
Yeah, DOT-4 absorbs moisture much faster than...

Yeah, DOT-4 absorbs moisture much faster than DOT-3, so I change it yearly during winter overhaul.
Forum: Ninjettes At Speed May 5th, 2022, 08:26 AM
Replies: 46
Views: 2,045
Posted By DannoXYZ
On stock bodywork, there are inner pieces under...

On stock bodywork, there are inner pieces under fairings that seal gap around radiator. On my race-bike, I have gaps. Even with removing fan, I haven't had overheating issues, even on +45C days @...
Forum: The Ex-Ninjetters Lair May 5th, 2022, 03:04 AM
Replies: 10
Views: 332
Posted By DannoXYZ
Oh no!!! You OK?

Oh no!!! You OK?
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