A couple of little bikes

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melburgorbust
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Joined: Wed Sep 19, 2007 1:25 pm

A couple of little bikes

Post by melburgorbust » Sun Feb 02, 2014 3:05 pm

Hi Guys,

I thought I'd do a quick introductory post as we are heading out to race on the Salt for the first time this year.

We will have 2 motorcycles with us, in the Modified Production 50cc and Modified Production 100cc categories. One is a brand new Skyteam Ace, the other a 1960's Yamaha YL1.

Both bikes are nearing readiness for racing, with all unnecessary components removed, lower handlebars for better airflow, carby, exhaust and CDI rework on the Skyteam, custom made expansion chambers on the YL1 and all the necessary safety work aside from steering dampers (still waiting on these to arrive).

We are not pushing the boundaries of the bikes too far this time around, just building bikes which will safely make a few passes at a good speed for their categories to get a feel for the event and riding on salt.

We are planning on camping and are keen on any advice not already in the info forum regarding racing and camping at the event.

I am in the process of sorting tyres for both bikes at the moment, and due to how skinny the wheels are the highest speed rating I can find is S. Given that this is 180kph (a good 50kph higher than we are aiming for from the faster of the 2 bikes) can anyone confirm if this will be acceptable?

Here's the bikes as they stand today, as you can see there is still a good bit of fettling to go:
Image
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BONES
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Re: A couple of little bikes

Post by BONES » Sun Feb 02, 2014 3:59 pm

I recon you will be fine.
You will have plenty of performance increase with those tyres
I just checked the rule book and it does say H minimum . Maybe a call to Ross Brown (head bike scrutineer)
Bones

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ROSS BROWN
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Re: A couple of little bikes

Post by ROSS BROWN » Mon Feb 03, 2014 9:07 am

" S " rated will be fine for your classes..
But if you are looking for odd rated tires , check the "AVON " catelouges.

Bikes look good 8)

Ross..
IT IS ALL A RACE AGAINST TIME.
TIME WAITS FOR NO ONE.

HOW FAST CAN YOU GO ?

S/UF 925

melburgorbust
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Re: A couple of little bikes

Post by melburgorbust » Mon Feb 03, 2014 10:09 am

Thanks Ross and Bones,

I was uncertain as there is no record in either category at the moment, but given that even the Special Construction Partial Streamlining 100cc has only hit 150ish km/h I was hoping that 180km/h tyres would be fine. There is however a possibility that the Yamaha will hit 70mph, which would mean a H rated tyre according to the rulebook.

Avon has nothing above S rating in these widths (2.75 and 3 x 17)
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melburgorbust
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Joined: Wed Sep 19, 2007 1:25 pm

Re: A couple of little bikes

Post by melburgorbust » Mon Feb 03, 2014 10:27 am

Also, with regards to 2 strokes and oil, are there any preferred/not preferred 2 stroke oils for racing on the salt?
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AuotonomousRX
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Re: A couple of little bikes

Post by AuotonomousRX » Mon Feb 03, 2014 1:02 pm

melburgorbust wrote:Also, with regards to 2 strokes and oil, are there any preferred/not preferred 2 stroke oils for racing on the salt?
I like the Ester Based Fully Synthetic in the Engine. It's a personal preference thing as long as it's Good Quality and matches your type of set up and the Fuel you run.

I run Race Gas and still have the Oil Injection so I use Fuchs Silkolene Comp 2 Plus and have it on the "Rich" side.

Castrol MTX Gear Oil in the Gearbox/Clutch seems to work well in the RGV.

There are other options if you run Pre Mix.

Pete :D
Metric Target 250 on a 250 on a Red Bike

Pete :shock:
DLRA #866
SATA #49

melburgorbust
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Re: A couple of little bikes

Post by melburgorbust » Mon Feb 03, 2014 1:25 pm

Thanks Pete, we'll be running the injection system too at this stage
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RGV
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Re: A couple of little bikes

Post by RGV » Mon Feb 03, 2014 5:17 pm

When you buy your oil make sure it is rated as injection oil. Premix oil is too thick for the injection and you will do an engine. Most injection oil is w30 and premix is w50.

As Pete said any brand name oil, the best you can afford. Hardly worth saving $20 on oil for all the time/$$ invested.

Dave

Last Minute Racing "its a 2-stroke ya twit - Its supposed to smoke"
DLRA #928
SATA #10

2010 MPS/G 250 118 MPH:)
2011 Washed Out:(
2012 Washed Out:(
2013 MPS/G 250 131 MPH (RECORD):)
2014 MPS/G 250 140 MPH (RECORD):)
2015 MPS/F 250 DNF:(

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BONES
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Re: A couple of little bikes

Post by BONES » Mon Feb 03, 2014 5:26 pm

Caster based oils--
Castrol 747 or R30 for older engines that don't rev so hard.
R30 is good for TZ 350s and TZ 750s.
Don't forget to use lots 20:1.
Don't believe what is written on some containers-- 40:1 might work for a mx bike- no good for a road race bike -- and death for a salt bike.
The more oil you can put in the greater the HP will be. Jet richer because of the leaner fuel mixture.
I run the YZ80 at 20:1 with rf 100
If you are going to use the oil injection R30 and 747 are too thick to pump
Bones

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AuotonomousRX
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Re: A couple of little bikes

Post by AuotonomousRX » Mon Feb 03, 2014 7:12 pm

Yeah what Dave and Bones said, that is why I run the Comp Plus 2 it's for Oil Injection systems.

Pete :D
Metric Target 250 on a 250 on a Red Bike

Pete :shock:
DLRA #866
SATA #49

melburgorbust
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Re: A couple of little bikes

Post by melburgorbust » Tue Feb 04, 2014 9:46 am

Thanks for that.

I've just finished making race-spec chainguards (photos later tonight).

I notice that there is a comment about 'Optional Exhaust Systems' in the Modified Production rules. I assume I am allowed to make up any sort of custom exhaust that I like in this category so long as it does not point towards the rider or salt or back tyre and does not extend past the rear end of the back tyre? I can't see any other comments in the rules relating to exhaust so I assume that this is acceptable, just wanted to check as the word 'optional' stood out to me.
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hawkwind
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Re: A couple of little bikes

Post by hawkwind » Tue Feb 04, 2014 2:08 pm

yes any exhaust you like....wrt the rules which are as you have posted . good luck and go for it :)
Vehicle......................A new creation.
Designed by................Troglodyte.
Engineered/ built by......Rustic.
Financed by.................Nickles & Dimes.
Rider......................... Tardus Vetus Inflatio

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RGV
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Re: A couple of little bikes

Post by RGV » Tue Feb 04, 2014 6:30 pm

If the exhaust is for the Yam, ALL 2 STROKES MUST BE LOUD. :wink:

Dave

Last Minute Racing "its a 2-stroke ya twit - Its supposed to smoke"
DLRA #928
SATA #10

2010 MPS/G 250 118 MPH:)
2011 Washed Out:(
2012 Washed Out:(
2013 MPS/G 250 131 MPH (RECORD):)
2014 MPS/G 250 140 MPH (RECORD):)
2015 MPS/F 250 DNF:(

melburgorbust
Posts: 41
Joined: Wed Sep 19, 2007 1:25 pm

Re: A couple of little bikes

Post by melburgorbust » Tue Feb 04, 2014 7:06 pm

RGV wrote:If the exhaust is for the Yam, ALL 2 STROKES MUST BE LOUD. :wink:

Dave
Definitely passes that test :D The Yamaha currently features a pair of custom made expansion chambers built to 1960's Yamaha racing specifications.
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melburgorbust
Posts: 41
Joined: Wed Sep 19, 2007 1:25 pm

Re: A couple of little bikes

Post by melburgorbust » Tue Feb 04, 2014 7:13 pm

Here's the Yamaha's loudpipes :)
Image

Got around to putting a quick lick of paint on the Skyteams pipe as well this week
Image

Chainguards are made to DLRA spec as the originals were somewhat thinner material
Image
Image
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