ESE's works engine tuner

[TZ350]

Sunday saw Rob spilling the beasts innards all over the grass to find out what was causing Saturdays problem.

A big thankyou to FarmerKen for bringing a complete clutch assembly back with him Sunday morning for the Beast.

As we had initially thought that the jerky transmission problem could be smeared driving dogs or a bent selector or more likely damaged splines in the clutch hub, which has happened before. I wiped the clutch cover off to replace the clutch with FarmerKens spare but as it turned out the problem was that the gear selector was not moving far enough to select the next gear, and that was easily fixed.

Race one
11th on the grid and the beast hurtled away and we worked our way up to 5th within a couple or 3 laps, the fast 4 were still in sight until at the end of the straight just as I was tipping in for the right hander the beast nipped and threw us both down the road for a skid, no damage to bike or rider.

While I was setting the clutch up I noticed oil in the magneto housing and after the Sunday practice when we were changing sprockets I noticed how hot the Beast had been running and intended to up the main jet but in all of the rush it got forgotten.

So the nip up could be due to a leaky timing side oil seal or to, to small a main jet. I really should get a EGT and CHT gauge/data logger and use it like Wobbly suggested for keeping the jetting right and a crank case pressure tester like F5Dave has posted would be a good idea too.

Wobblys idea is that you find the optimum main jet using the dyno and then jet the bike at the track to achive the same EGT as it did on the dyno.

And another big thankyou to Cotswold for riding the thing and giving me a chance to straigten the Beasts kinks out and Henk for lending me a blow up mattress, what a life saver.

[wax]

This is the system I use its awesome. Made by josh alleman http://www.thescootergarage.com/

[husaberg]

A big thankyou to FarmerKen for bringing a complete clutch assembly back with him Sunday morning for the Beast.

We initially thought that the jerky transmission problem could be smeared driving dogs or a bent selector or possibly damaged splines in the clutch hub, which has happened before. I wiped the clutch cover off to replace the clutch with FarmerKens spare but as it turned out the problem was that the gear selector was not moving far enough to select the next gear, and that was easily fixed.



While I was setting the clutch up I noticed oil in the magneto housing and after the Sunday practice when we were changing sprockets I noticed how hot it had been running and intended to up the main jet but in all of the rush it got forgotten.

So the nip up could be due to a leaky timing side oil seal or to small a main jet. I really should get a EGT and CHT gauge/data logger and use it like Wobbly suggested for keeping the jetting right and a crank case pressure tester would be a good idea too.

With the clutch you ever able to adapt a DR clutch pressure plate onto the beast Rob?
I can hear (reverberating in my head) grumbles from the old tuners that Air cooled 2 strokes are petrol cooled....
I did see a ram air cowling on TM the other day to They would look neat on a Suzuki

seen this today also........Much sturdier than i remember

[wobbly]

Any engine with a case leak will run rich, despite all the head scratching thinking it will suck air and go lean.
A leak will compromise the pumping part of the cycle,and the bigger the leak,the less fuel/air mixture is pumped.
If you jet down seeing a rich plug, it will seize, because then insufficient fuel/oil, is being ingested.
So unless you have pressure tested the whole engine before hitting the dyno, you will not be sure you have an accurate baseline.

If you have the RAD from the dyno runs plus the egt for optimum power then its easy to set up at the track.
BUT - beware, having only the drum inertia will not load the engine sufficiently , for long enough, to simulate the jetting required for roadracing.
For this you need a heap of eddy current load control to slow the acceleration rate in the higher gears of an all gear blast.
Then you can see the egt stabilise when at full noise for long enough, in 6th gear.

Just did this on Saturday at Taupo with one of the RZ400 - F3 racebikes.
The ref egt for max power in 6th on the dyno was 1255.
The RAD at Taupo on the day was 102 so I needed to go up one jet size from what we had at the RAD 99 dyno ref.
The egt max after practice one ( with the longest straight we now run on ) was 1235/1275, so went up one more on the LH side and 2 on the RH.
This gave max recall from the next run of 1197/1204, thus I could see we had full control of the egt and a split of 2 jets.
Ran 4 by 20 minute sessions like that, and from a full noise plug chop at the end, I would now add 1* of timing to the RH side, and go back to a 1 jet split with one size leaner overall.
This then gives us a new baseline at 102 RAD.
Safe as houses, and fast as hell when you have all the info, and good plugs that read both ignition advance and jetting.

[2T Institute]

giving me a chance to straigten the Beasts kinks out and Henk for lending me a blow up doll, what a life saver.

So more than a few kinks to straighten out then FWIW I wouldn't have lent you mine

[TZ350]

.... got the first A-Grade race of the day.



Near miss Crazyman! Damn dirtbikers!!!!

Cameo appearance by Cotswold and the Beast plowing up some dirt.

In practice the 30hp bikes of Cotswolds and Speedpros did not appear to have any real speed advantage over Regan's and Rich's FXRs up the back straight, but strokers with anything much less appeared to be at a real disadvantage.

Half way into the clip you can see the fast 24hp FXR's of Regans (colorful leathers) and Rich's rocket easily gapping the low low to low 20hp 2-strokes of Rick52's, Garrys and Dave M's each time they went up the back straight.

In the last race Dave M decided to sit it out and wait until he gets his 30 hp engine. He figured there was no point in hurting himself trying to make up the power deficit with extreme cornering speed and out riding his bikes abilities.

In race two Rick52 was able to take advantage of a mistake RichBan made as he braked for the hair pin and took the lead which he held to the end. Rick was riding the wheels of his bike and its the first time I have seen an RS chassis flapping the front wheel about as he changed direction coming down the hill, great effort and a well deserved win but not repeatable in race three, it needed Rich to make another mistake which he didn't.

To me it looked like the front running 2-Strokes were to under powered for the job which left to much for the riders to make up with their riding talent, it just couldn't be done.

Race 1 10 laps 4T 4T 2T 2T 2T
Race 2 15 laps 2T 4T 4T 2T 2T
Race 3 20 laps 4T 4T 2T 2T 2T

Full results including individual lap times.

Short set of photo's from North Island Championship Rd2. Mainly of the A Grade boys in action.



Race Day:
Two seconds and a third for Regs; massive starts helped close the grid gap. but Richban & Rick had the pace up front; none the less they were great races to watch. Crazyman finished mid pack on the borrowed bike; which was a sterling effort.

[kel]

In race two Rick52 was able to take advantage of a mistake by RichBan in the hair pin and took the lead which he held to the end. Rick was riding the wheels of his bike and its the first time I have seen an RS chassis flapping the front wheel about as he changed direction coming down the hill,

Thought I was seeing things when the wheel left the ground, have ESE been assisting in engine development? Straight line speed was clearly higher than the other 2 strokes.

[richban]

In the clip you can see the fast 24hp FXR's of Regans (colorful leathers) and Rich's rocket easily gapping the low low to low 20hp 2-strokes of Rick52's, Garrys and Dave M's.

Regan's bike is down a little on power to mine. Its the weight difference and the riding ability that has him looking so fast. Also when Rick came past after my cock up there was know way I was gaining anything till maybe the very end of the straight. And then there was nothing in it. I would say they are maybe 40kg lighter than me and my bike. That evens things out quite a bit. Also you have to factor in that rick looked quite rough in the morning I was feeling maybe 2% better than he looked. Regan only had 3 beers. Smart move for sure.

[TZ350]

My father came along to watch the racing on Sunday and set up a camera ... The video is awesome. Thanks Dad!! Video: http://www.youtube.com/watch?v=wDnJy6F0YRE

Really great clip made by Str8's Dad ...

[crazy man]

Regan's bike is down a little on power to mine. Its the weight difference and the riding ability that has him looking so fast. Also when Rick came past after my cock up there was know way I was gaining anything till maybe the very end of the straight. And then there was nothing in it. I would say they are maybe 40kg lighter than me and my bike. That evens things out quite a bit. Also you have to factor in that rick looked quite rough in the morning I was feeling maybe 2% better than he looked. Regan only had 3 beers. Smart move for sure.

your right . to this day we have never done any dyno tuning so can't wait till we have are dyno up and going to pull some more ponys out of it

[Yow Ling]

your right . to this day we have never done any dyno tuning so can't wait till we have are dyno up and going to pull some more ponys out of it

We are very very close with our dyno , so not far behind you. Have run up the drum and the drum sensor is being logged, just need to hook up the ignition sensor and set the value for the drum inertia.

[TZ350]

Help Wax or someone else who realy knows, which way does the belt rotate? on a Yamaha Zuma, anti clock wise? and is this the same for all CVT scootor matics? Not knowing how the final drive reduction box is arranged leaves me guessing about the drive belts direction.

[speedpro]

anticlockwise. front pulley is fitted to end of the crankshaft itself so rotates at engine speed. at high ratio the rear pulley is doing engine speed times CVT ratio so it can be spinning pretty quickly.

[speedpro]

Just one place you can get cheap aftermarket parts:

http://stores.ebay.com/jiangwayne-co...4.l1581&_pgn=2

[TZ350]

Thanks for that, I wasn't sure because the engine could be run in either direction.