Team GPR

[Bert]

Only brent can answer when he started but i guess it was about 5years ago??????????????

You should read the date on the post..

cheeky bugger.


Nope, the engine arrived from long term storage in ~Jan (but the plan had been worked through for a little longer than that).
Easter 2010 saw the final demise of the mighty TF100 (at that stage ~18 years old. read: had been used for bucket racing for ~18 years) So we ramped up the development.

Originally it was going in a TZ125 frame I had picked up from Japan. The Crazyman (after much convincing) started my TZR250 project (which just happened to fit the TZR125/100 as well).

Finished in time for the Taupo GP last year (in fact the Friday before driving up was the first run; after getting back from my honeymoon); and while I finished the 2011GP well down the order; i was one of the few Two strokers left running....

The last 10 months have been sorting out all the little issues with an unknown build; incremental improvements...

so HUSA hows the NSR coming along?

[husaberg]

You should read the date on the post..

cheeky bugger.


Nope, the engine arrived from long term storage in ~Jan (but the plan had been worked through for a little longer than that).
Easter 2010 saw the final demise of the mighty TF100 (at that stage ~18 years old. read: had been used for bucket racing for ~18 years) So we ramped up the development.

Originally it was going in a TZ125 frame I had picked up from Japan. The Crazyman (after much convincing) started my TZR250 project (which just happened to fit the TZR125/100 as well).

Finished in time for the Taupo GP last year (in fact the Friday before driving up was the first run; after getting back from my honeymoon); and while I finished the 2011GP well down the order; i was one of the few Two strokers left running....

The last 10 months have been sorting out all the little issues with an unknown build; incremental improvements...

so HUSA hows the NSR coming along?

I don't know if its the setting on the computer here but its not displaying the date?
There is some news on the NSR but it will have to wait just a little bit more. Vanessa has taken a bit of a twist.

[Bert]

I don't know if its the setting on the computer here but its not displaying the date?
There is some news on the NSR but it will have to wait just a little bit more. Vanessa has taken a bit of a twist.

What did you decide to go Yamaha

[husaberg]

What did you decide to go Yamaha

Twist not bent

Out of interest Brent when did you start?

[Bert]

Twist not bent

Out of interest Brent when did you start?

1994  was my first GP at Ohakea; not old enough to drink by a long shot (but have a memory of sitting in the mess afterwards)..

Right the answer to the question about the TZR100:
Jan 2010 the wooden box arrived from the UK (from long term storage).
April-june 2010 the piston sorted and sleeve done.
September 2010 head machined for insert.
October2010 frame started
Jan 2011 Frame fitment resolved for TZR100
then the rest was history.
so only a year from ground up. the last year has been slow progress due to other things going on.

[husaberg]

1994  was my first GP at Ohakea; not old enough to drink by a long shot (but have a memory of sitting in the mess afterwards)..

er i meant the Yamaha TZR100

[Bert]

Huummmm Interesting.

.......
Some work to do.....
Dyno plot is 6000 - 12000
Attachment 277661

The ignition curve and servo opening are attached.

So we leaned it off by dropping the needle (which slightly improved things); but me thinks ignition and servo adjustments may be required.

Well slowly improved it (following everyones advice)

at least its not a hole any more.

three of the best: (needle lifted one groove to rich it up; while testing)



Servo & ignition


we tried to advance it more between 8-10k but didn't really seem to help (didn't take of photo).

servo closed to half open also didn't seem to be significantly different the bottom end; thus set it at half open; to reduce the open/closing required.

comparison to Crazyman's FXR.... more work required

[richban]

Well slowly improved it (following everyones advice)

at least its not a hole any more.

three of the best: (needle lifted one groove to rich it up; while testing)



Servo & ignition


we tried to advance it more between 8-10k but didn't really seem to help (didn't take of photo).

servo closed to half open also didn't seem to be significantly different the bottom end; thus set it at half open; to reduce the open/closing required.

comparison to Crazyman's FXR.... more work required

Is it the Pipe got another one you can bug on and test??????

[Bert]

My God its great having a dyno.
But we are still learning the software and the rescaling of the graphs (changes to weather conditions) had me a little stumped; at times we were going backwards...
hence great to over plot Crazymans FXR for a consistent comparison.


So; over the past week Crazyman and myself have been making some changes and have managed to improve things a little (60 odd dyno runs later; toooo very tempting to make gross changes).

Change 1. Session 2
Following Wobs advice better regarding setting up the Ignitech... and bulked up the advance a little and changed the way the servo opens.


Change 2. Session 3
Modified the stinger tube (added in a reducer, stepping it down to 20mm ID from 24mm ID).
it is still a standard RS125 pipe & it seems to still be only recording ~400 degrees in the header; so there is still work to be done I think (more reading to be done about this).

Change 3. Session 3
Swaped to a modified 31mm PWK (re-profiled bell mouth) and improved the response in the mid range (worked on finding the correct pilot, needle & main jet combo).


Session 2. Sunday vs. last week



Session 3. So here's a comparison with the best run we achieved monday night:



And well the target is Crazymans FXR so here's the slow improvements:


Still got a hole; but its slowly getting better as we uncover the different issues.

Staggering to think that I've been racing this around for nearly a year in this state. But at least it has forced me to ride harder in the corners and sort out myself..

[F5 Dave]

Looking good. Every bit as good as my 100 last time I had it out.

[Bert]

Team GPR Race Date Calendar

Click me

Only did it as wifey keeps wanting to know all the dates..... then forgets and asks again... then again.... then again.... you get the picture....

Looks like March might get me in the dog box.....

[seymour14]

Team GPR Race Date Calendar

Click me

Only did it as wifey keeps wanting to know all the dates.....

Great stuff, very partial to buckets of beer and bullshit!

Looks like you might have a GP to put on soon as well.

[Henk]

Team GPR Race Date Calendar

Click me

Only did it as wifey keeps wanting to know all the dates..... then forgets and asks again... then again.... then again.... you get the picture....

Looks like March might get me in the dog box.....

Stick her birthday and your wedding anniversary in there as well. Might save some grief later on.

[seymour14]

Seeing there has been a lot of debate on rules and such, time for me to revert to enjoying Buckets for what it is.

So being the least motorcycle sports minded of the Griffiths boys, I am building (along with grateful help from my bro the Crazyman) a new FX125/FXR 150 hybrid.

It's only a hybrid because I am using leftovers from another FXR in the shed, and a Suzuki FX125 scooter that I picked up for nicks (this is my donor engine). First thing of note is that outwardly the engine seems the same, but once out of the scooter and being "negotiated" into it's new home, it became apparent that the oil cooler is mounted ever so slightly higher in the scooter and will need dropping down, more annoyingly was the fact that the engine sprocket only protrudes about half the distance out from the engine as an FXR's one does!

Combination of work on the front sprocket to bring it outwards, and the rear hub to move the rear sprocket inboard , should account for this and get me good chain alignment again.

(Just noting all this as we go for anyone who finds themselves doing a similar experiment).

My donor fuel tank is dented and has the "Swiss cheese" factor along the bottom, some work to do there!

Otherwise it is worth noting that the usual alterations and disc grinder work is going to happen soon, remove all the Mig wire strands that are poking out of the usual FXR frame! Work so far amounts to 4 hours. Nice for anyone who wonders how long a build might take, and I am a novice at this.

In the long run the engine will get worked, for now I want to use it under powered as is (13hp on Dyno). Better to work on good racing technique then to have it all from day one in my view! You learn how to get the most out of an under powered bike before the move to something better.

Interestingly, an FX125 has a five speed box, with slightly different gearing in 3rd and 4th from memory, might prove good on smaller tracks, but will struggle at Taupo me thinks!

Couple of photos, me and my boys, and the FX125.

[Henk]

Just nylon up the 125, will look way better than all those rough looking FXRs and hybrids out there at the moment.