Ton up SR250 - a cafe racer by the numbers: 100mph, 100kg, 30hp

Maritime

Over 10,000 Posts
OK I wasn't paying that close attention that you wanted brush on. Not sure about Sweden but here we have rust -o- leum in brush on and it works well and is durable etc. I use it to touch up frames when I don't want to pull everything off to spray paint.
 

zap2504

Been Around the Block
Maritime said:
OK I wasn't paying that close attention that you wanted brush on. Not sure about Sweden but here we have rust -o- leum in brush on and it works well and is durable etc. I use it to touch up frames when I don't want to pull everything off to spray paint.
They have several interesting products under their Professional and Industrial tabs (but not sure about availability outside the USA):
https://www.rustoleum.com/
 

Rider52

Coast to Coast
The old time Brit restorers used stove enamel on the frames. Jeff Clew wrote a really detailed restoration guide "The Restoration of Vintage & Thoroughbred Motorcycles" https://www.amazon.com/Restoration-Vintage-Thoroughbred-Motorcycles/dp/0854298533
 

doc_rot

Oh the usual... I bowl, I drive around...
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Ive used Por-15 chassis paint with a brush on application with good results. it self levels so brush marks go away.
 

pidjones

Over 1,000 Posts
I've used POR-15 engine paint, and will again - good stuff. I understand that their chassis paint is very rust-resistant, but should be clear coated to prevent UV fading.
 

Brodie

Gold Coast, Queensland
DTT SUPPORTER
I painted my old boat using white knight rust guard. Just cleaned and prepped really well and then painted it on with a 4 inch brush. Only had to touch it up when we rubbed against logs and such in the creeks.
 

JadusMotorcycleParts

Over 1,000 Posts
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Maritime said:
OK I wasn't paying that close attention that you wanted brush on. Not sure about Sweden but here we have rust -o- leum in brush on and it works well and is durable etc. I use it to touch up frames when I don't want to pull everything off to spray paint.
Awesome, thanks for the tip man! Have heard good things about rust-o-leum. The quality of the final result will be based a lot on the actual bare metal prep too I imagine (as with all paint jobs!) :)
 

JadusMotorcycleParts

Over 1,000 Posts
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Wow, thanks for all the input and tips! Awesome stuff. Cheers.

Looking at either a rust-o-leum paint or the Por-15 top coat - if I can get a hold of it in Sweden! Just googling around Por-15 looks like it is very common and gets very good results - mostly for car chassis but in that way it will be great for a bike frame.

Also an interesting read and comparison:

https://4wdlife.com/chassis-saver-vs-por-15
 

Attachments

Bubba1982

New Member
Hi Jake, how's it going?

Loving following this build, thanks for sharing!!

Would you be interested in sharing the dimensions for these bushes, I know you thought people might think they were too expensive to produce for the Jadus web shop but looking at the replacement OEM parts cost and how awesome these brass and stainless ones look I think they would be very popular..

If not maybe as a paid download for us to get a local machine shop to make them up, like you did with the 3D print side panels?

JadusMotorcycleParts said:
I got these back from the machinist this week too. They look great and I sure hope they fit! To avoid needing the stock end seals (which go for 35Euro each!) I increased their flange thickness a little (so they mate up to the inside of the frame) and added an oring groove on the inside. This is to keep grease in and dirt and water out. This works really well with other products I work on (water treatment industry) so hoping it works here too.
 

JadusMotorcycleParts

Over 1,000 Posts
DTT SUPPORTER
Hey man, thanks for following!

Your comment got me thinking again because I had actually shelved that project after the prototypes - like you say, due to cost. The best price I could do for the set would be 80Euro (ex.VAT) which I thought would be too much for the average SR250 build/builder - especially for a part that is not seen and is not 'cool'. However, looking through the Yamaha parts websites it looks like the best, bare minimum replacement parts (bushings and shafts) would cost 110Euro (ex.VAT)!!! And that is not including the unobtanium bush seals at each end which go for 38Euro (ex.VAT) each (!) everywhere I have looked. Annnd the kit that I designed eliminates the need for those seals because of the internal oring seal ;)

It would be a big investment for Jadus to do a limited production run of these so I will need to think about it more and do the math. I remember interest for them was pretty low = high risk for the company.

In the mean time you'll have to buy the standard items because I unfortunately wouldn't be willing to give up the design for these - some smart-ass will come along, steal the design, make them in China and sell them - ripping off Jadus. Have learned this the hard way with other jobs :(

The side covers were a little special in that case. The investment to make tooling for them would have been over 18,000Euro and the ROI was very, very small. So I thought stuff it, if I am not going to make them, I'll allow others to make them themselves - it was shame to waste the invested development time and the design. I figure if someone else with the money and will to bear the risk takes the design of those and starts manufacturing them, it'll just be good for the SR community :)

Wow, sorry for the long rant ;D Happy weekend all!
 

Bubba1982

New Member
No worries at all man, I actually felt like a bit of a d**k thinking about it after, it was kind of cheeky knowing you have spent a lot of your time and personal effort designing and testing them. I totally respect you not wanting to give it away, they are a great upgrade and a cool idea even though technically unseen, when you compare them to the quality of the stock items and crazy price I would prefer them over the OEM all day log.

Looking forward to what you come up with next :D

Thanks again man :)

JadusMotorcycleParts said:
Hey man, thanks for following!

Your comment got me thinking again because I had actually shelved that project after the prototypes - like you say, due to cost. The best price I could do for the set would be 80Euro (ex.VAT) which I thought would be too much for the average SR250 build/builder - especially for a part that is not seen and is not 'cool'. However, looking through the Yamaha parts websites it looks like the best, bare minimum replacement parts (bushings and shafts) would cost 110Euro (ex.VAT)!!! And that is not including the unobtanium bush seals at each end which go for 38Euro (ex.VAT) each (!) everywhere I have looked. Annnd the kit that I designed eliminates the need for those seals because of the internal oring seal ;)

It would be a big investment for Jadus to do a limited production run of these so I will need to think about it more and do the math. I remember interest for them was pretty low = high risk for the company.

In the mean time you'll have to buy the standard items because I unfortunately wouldn't be willing to give up the design for these - some smart-ass will come along, steal the design, make them in China and sell them - ripping off Jadus. Have learned this the hard way with other jobs :(

The side covers were a little special in that case. The investment to make tooling for them would have been over 18,000Euro and the ROI was very, very small. So I thought stuff it, if I am not going to make them, I'll allow others to make them themselves - it was shame to waste the invested development time and the design. I figure if someone else with the money and will to bear the risk takes the design of those and starts manufacturing them, it'll just be good for the SR community :)

Wow, sorry for the long rant ;D Happy weekend all!
 

JadusMotorcycleParts

Over 1,000 Posts
DTT SUPPORTER
A process of diminishing returns... ;D ;D ;D ;D

I am not leaving many stones unturned here and the fork brace, despite weighing very little and certainly much less than the stock SR mudguard, is a billet component with a lot of aluminium that is not that critical to stiffness. So I sketched a couple ideas to remove some material and then came to the conclusion that holes would match the other components of the bike best 8)
 

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crazypj

Split personality, I fake being smart
The bronze swing arm bushing are probably common to a load of different Yamaha's so investment may be worthwhile if you find out what else uses them. It may be better to advertise the dimensions as well as various bikes ?
 

JadusMotorcycleParts

Over 1,000 Posts
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spotty said:
every 5.1 grammes counts

how much do you think its lost so far ?
Haha exactly. I would guess about 20kg so far. I am not sure I will make the 100kg goal but it should for sure be under 110kg (stock is 130kg-ish).
 

JadusMotorcycleParts

Over 1,000 Posts
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crazypj said:
The bronze swing arm bushing are probably common to a load of different Yamaha's so investment may be worthwhile if you find out what else uses them. It may be better to advertise the dimensions as well as various bikes ?
That is a good point crazy. I would need to investigate those possibilities.
 

crazypj

Split personality, I fake being smart
JadusMotorcycleParts said:
Haha exactly. I would guess about 20kg so far. I am not sure I will make the 100kg goal but it should for sure be under 110kg (stock is 130kg-ish).
I should think you can easily get to 100Kg with all the work and titanium on it? Swapping from steel to alloy wheel rims saves almot 3Kg, modern tyres made with Kevlar instead of steel bancs are another major weight saver. As for bronze bushings, Kawasaki were the only manufacturer who deliberately made (or had made) weird sized parts, always 'off' by 0.5 ~1.00 mm compared to everyone else. I guess they could afford to be 'exclusive' though, Kawasaki Heavy Industries is still a major world player, motorcycle division is a tiny percent of business
 

JadusMotorcycleParts

Over 1,000 Posts
DTT SUPPORTER
crazypj said:
I should think you can easily get to 100Kg with all the work and titanium on it? Swapping from steel to alloy wheel rims saves almot 3Kg, modern tyres made with Kevlar instead of steel bancs are another major weight saver.
I'm really hoping for that man! I already have my eyes on an industrial scale we have at my day job for weighing outgoing packages. It is big enough for a motorcycle so I will be able to put an exact number on it once it's complete :D

crazypj said:
As for bronze bushings, Kawasaki were the only manufacturer who deliberately made (or had made) weird sized parts, always 'off' by 0.5 ~1.00 mm compared to everyone else. I guess they could afford to be 'exclusive' though, Kawasaki Heavy Industries is still a major world player, motorcycle division is a tiny percent of business
True. Always powerful for a company to have a cash cow or few to support other R&D products/projects that have smaller returns. Yamaha must make a lot from their other ventures too - engines, boat motors, instruments. They must be different companies but I am sure money flows between them? I know it is like that for Sony at least - a buddy of mine works for the mobile development company and they haven't made a profit for years - but the other ventures prop it up.
 

crazypj

Split personality, I fake being smart
Sony seems to be a pretty evil corporation only interested in money. I avoid their products whenever I can. Sony was instrumental in the Draconian copyright laws now in place. (remember they put malware on CD's so you could even play them on computers, just in case you tried to copy to hard drive?) tPretty sure they want a total monopoly in entertainment and electronics?
 

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