Team GPR

**Bert** · 9th January 2013, 19:49

Hi Everyone.

for those of you that have purchased our front master cylinders in 2012.
we are happy to say that we have finally soured replacement levers at a price that won't break the bank (your's for $20 each).

We should have them well before the next North Island round (including a new shipment of Master cylinders and 100% cnc alloy throttles), maybe by the next Welly KOK.
so If you have missed out, had a crash or are wanting an upgrade or spare; give us a heads up and we will make sure we have them at the track.

Don't forget Round 4 Manfield 16th Feb(backtrack) and the trackday on the sunday (full track) its a hoot playing around with the bigger bikes on ya bucket.

EDIT:
North Island series has been changed due to issues with the Manfield double booking.
Click here
The event will now be in Wellington; at Kaitoke. On the 23/24 Feb.
Well done Skunk for getting this resolved

**seymour14** · 9th January 2013, 20:44

Originally Posted by Bert

Hi Everyone.

for those of you that have purchased our front master cylinders in 2012.
we are happy to say that we have finally soured replacement levers at a price that won't break the bank (your's for $20 each).

We should have them well before the next North Island round (including a new shipment of Master cylinders and 100% cnc alloy throttles), maybe by the next Welly KOK.
so If you have missed out, had a crash or are wanting an upgrade or spare; give us a heads up and we will make sure we have them at the track.

Don't forget Round 4 Manfield 16th Feb(backtrack) and the trackday on the sunday (full track) its a hoot playing around with the bigger bikes on ya bucket.

Some light entertainment on the Sidecars between other events (I think Crazyman may have got on the piss early judging by his camera work)!

Good to see more of these, preferably going!!

**seymour14** · 11th January 2013, 10:47

Ahhh, the good old days, see you all on the 23rd to 24th of February it seems. Remembering a great Round and looking forward to the next.

**Bert** · 21st January 2013, 07:45

The GPR boys gate-crashed the annual Honda track day at minefield yesterday.

Offered up a couple of great opportunities:

1. wide open testing (resolving jetting issues in my bike).

2. A chance to race (read attempting to follow in my case) around with one of NZ's demigods; Mr Slight (playing in second gear on his CBR).

Big DG took the opportunity to tell Slight what he was doing wrong out there

We couldn't quite convince him to trade in the honda for a GPR150; but much giggles was had by all.

Great to see Crazyman out on his Kawasaki 750 superbike for the first time in couple of years (and enjoying it) and also test riding Steve B's IMD250 for the first time (which looked really good on the track).

**seymour14** · 21st January 2013, 12:18

Originally Posted by Bert

The GPR boys gate-crashed the annual Honda track day at minefield yesterday.

Offered up a couple of great opportunities:

1. wide open testing (resolving jetting issues in my bike).

2. A chance to race (read attempting to follow in my case) around with one of NZ's demigods; Mr Slight (playing in second gear on his CBR).

Big DG took the opportunity to tell Slight what he was doing wrong out there

We couldn't quite convince him to trade in the honda for a GPR150; but much giggles was had by all.

Great to see Crazyman out on his Kawasaki 750 superbike for the first time in couple of years (and enjoying it) and also test riding Steve B's IMD250 for the first time (which looked really good on the track).

The old man enjoys a good chin wag, here he is telling Slighty how to ride at Pukekohe at the 2005 Classic Motorcycle Racing Register's annual festival. Also giving John Britten a hearty thumbs up for his contribution to NZ's racing history! (Think we have some Britten Cams in the back shed too from memory!)

Wish I took a photo of him chatting with Giacomo Agostini whilst he was here a few years back.

**seymour14** · 21st January 2013, 20:43

Sorry Crazyman, know you like your lasties thread!

(500 replies to this thread if you can't work it out!)

**husaberg** · 21st January 2013, 21:01

fixed that for your Crazymandad I suspect that no one will ever notice

**seymour14** · 22nd January 2013, 06:13

Originally Posted by husaberg

fixed that for your Crazymandad I suspect that no one will ever notice

Where's Wally?

**Bert** · 31st January 2013, 06:28

Huummmm Interesting.

now that the GPR DYNO is up and running it was time to test the GPR100 (TZR).

At minefield the other weekend it was noticeable that the power dropped off during the mid range.
However none of us expected it to be as interesting as this.

Some work to do.....

Dyno plot is 6000 - 12000

Click image for larger version.

Name: Dyno - the big hole.JPG
Views: 78
Size: 62.7 KB
ID: 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.

Specs:
TZR100, 95-RS125 pipe, Exhaust duration = 198, Inlets = 123, comp 13.2:1, crankcase volume ratio 1.55.

Click image for larger version.

Name: portmap and bore.jpg
Views: 47
Size: 117.6 KB
ID: 277664

**F5 Dave** · 31st January 2013, 08:02

Hey that's actually some pretty respectable power, but yes I expect the PV opening time might be juggled to lose some of that drop. Certainly felt like it revved pretty low when I rode it. I wonder if the ign is dropping off too steep suppressing the revs. An inch out of the pipe may be a good idea, maybe a couple, those Yam cranks should be good for a peak power increase of 1000rpm or more.

Pretty rounded transfers as an observation.

Edit, sorry do yuo mean the transfers are 123 deg? That's 37.5 deg blowdown which is huge. I'd raise those for certain.

**husaberg** · 31st January 2013, 17:56

Originally Posted by F5 Dave

Hey that's actually some pretty respectable power, but yes I expect the PV opening time might be juggled to lose some of that drop. Certainly felt like it revved pretty low when I rode it. I wonder if the ign is dropping off too steep suppressing the revs. An inch out of the pipe may be a good idea, maybe a couple, those Yam cranks should be good for a peak power increase of 1000rpm or more.

Pretty rounded transfers as an observation.

Edit, sorry do yuo mean the transfers are 123 deg? That's 37.5 deg blowdown which is huge. I'd raise those for certain.

I think he does........
You can't fault your consistency Dave

Originally Posted by F5 Dave

why does it look like left & right front transfers are different sizes?

Transfers seem quite low. hmm, 38 deg blowdown is quite excessive, that will be quite peaky despite a tame ex port height. I'd be aiming for say 34.

**F5 Dave** · 1st February 2013, 08:30

have too much research time on your hands.

**husaberg** · 1st February 2013, 08:57

Originally Posted by F5 Dave

have too much research time on your hands.

yip but that one i remembered and found in under 30 secs as it confused me at the time re the port timmings as they seemed mismatched and i also didn't realise it had a single ex port.
I will have some materials arriving soon to keep me out of mischief for a while.

ps Brent ya bugger.... yours was even longer in planning than mine..............lol

**F5 Dave** · 1st February 2013, 10:47

He's been racing it for about a year

**husaberg** · 1st February 2013, 11:01

Originally Posted by F5 Dave

He's been racing it for about a year

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

Originally Posted by Bert

Hi all.
I been slowly building up a new F4 100cc two stroke bucket motor (first new motor in at lease 10 years) and I've got a few questions regarding:

1. Sparkplugs, Standard spark-plug (NGK B9EGV or NDw29ES*) thread lengths are normally 3/4" long, has anyone found a 14mm pitch racing plug that is in the same heat range (~NGK 9-10) that has a longer thread (lets say ~22mm, I recall something about tz125s & rotaxs kart motors having longer threaded plugs, so temp sensors could be installed)?
(reason: I'm figuring out the best way to profile my head). I've download the NGK catalogue but can't seem to find anything useful.

2. Carbs, Do early RGV (1988-90ish) require vacuum pressure or pressurised air-box to work correctly? (reason, I've got a box of carbs but the RGV fits the best).
Was planning on sleeving it down to 30mm. any help on these carbs would be great (I've spend hours looking/googling for information on these to no avail, so its time to ask).

3. Rubber engine mounts, I've done a little bit of work to mount the engine directly to the swingarm pivot, so now I just need to make some new rubber bushes. This is not looking like an off the shelve solution, so I'm going to need to make something up. I was thinking about some rubber hose with a steal insert (which the swingarm bolt go's through); but I'm not sure if hose will be dense enough or even be suitable. any thoughts ??

cheers in advance.

Brent