YSR50/80 Build

[Diablo007]

@Dvsrd
The DT led a rough life, I would go as far as to say it was abused and left outside to die.  Only electrics is the kill switch, all other wires other than the ignition have been cut from the flywheel/magneto.  The wiring harness, ignition switch, lights, and anything else related to the electrical has been removed.  It was also run in the mud without the flywheel/magneto cover and countershaft cover.  The flywheel is pretty pitted where the point foot rides.  Basically it would be a lot of time and money to get it street-able again.  I have some parts for it, and there are probably more buried in the shop, I'm just not sure it's worth the effort considering what I've mentioned and that it does not have a title.

@Djg8493
I'm found this on eBay and am contemplating getting it to replace the points in the DT engine due to what I mentioned about the flywheel/magneto.
https://www.ebay.com/itm/Yamaha-DT100-125-CDI-Conversion-Kit-Electronic-Ignition/164125456202?hash=item2636a3b74a:g:x6sAAOSwqlFdd44O

[Djg8493]

The electronic ignition is tempting, I would be curious if anyone has any experience with this one.  I'm always cautious with overseas sellers that have little feedback.  I have an old DT parts bike but I haven't had a chance to dig it out to see if the ignition parts are there or not.

The YSR would definitely be more fun with a bit more engine, I struggle to actually ride it anywhere outside of local neighborhoods as the top speed is hard to get past 35-40, maybe with the extra engine I will be less concerned with blowing it up. 

[EE]

I vote for a YZ125 swap...

[85RZwade]

I test-rode a YSR back in the day and I remember it getting my skinny ass up to an indicated 51 mph

[Diablo007]

@85RZwade:  Had an '87 YSR50 at the same time I started this project.  Bought it a back a few years ago from the same person I sold this project to.  I had the needle buried on the '87 on the back straight at Hawaii Raceway park.  Only mod was a stage 1 jet kit from Team Calamari.  I must have been over 165lbs with all my race gear on as I was about 155 buck naked.  Front tire would howl braking for the 'off-camber', frame and forks would wind up like a spring in the 'sweeper'.  Good times :cheesy:

@EE: We don't have a YZ125 engine in the shop.  There's a DT250 with a GYT built to Kenny Roberts specs, less pipe.  A few RD125 and RD200 engines in various states.  One of the complete RD125's has a GYT kit and is in an old race bike.  There's a complete stock TA125 so I won't be pulling that engine.  There's also a TZ250/350 but unfortunately that sold recently to a mainland racer.    Engine would have been way too big, as well as all the others.  There is a Sachs 125 engine in poor repair, can't remember how wide it is though.  There's also a Saracen with a Sachs engine in it...  My friend that owns the shop thinks we should see if we can fit an LT2...

For now I think I'll concentrate on the YSR80 engine, but do want to swap for an engine that is easier to find parts for, and an easy swap.

[Diablo007]

@Djg8493: I think HPI makes an ignition with a lighting coil.  I think it's one of their 'HPI universal innerrotor ignition'.

https://www.hpi.be/index.php

[Diablo007]

Pics of the build right now.  May not look like much more but the electrics are back in.  Had to make a new ignition switch using a NOS ignition for a different motorcycle in the shop and the contact plate from the stock one that was buggered.  Clutch cables are no longer available and crazy expensive on eBay so I made one.  Mine uses the threaded adjuster the side cover will accommodate.  Blinkers aren't working but I think that they will after cleaning the left hand switch gear.  Don't have a headlight to test with unless I remove the one from the other YSR, which I don' want to do as it's 99.9% original.  I think I have a 6V headlight for an enduro somewhere to test with.  Frame mounted lower fairing brackets (on upper frame rail) have been straightened and installed.  Need to buy 6mm button head cap screws and fender washers to mount fairings with, none of them were with the project when I obtained it 25 years ago.  Don't want to break the bank right now while in the test/assembly phase, or wait for shipping on the parts  :cheesy:

Planning on testing a 6800uF capacitor in place of the battery.  I have an original battery that is bad that I plan on gutting and hiding the capacitor in if it works to keep the 'stock' look.  For now I'm using a sealed lead acid battery.

Parts list is getting pretty extensive even with the parts I found in the shop.  Back when I sold it off I wouldn't have been able to do this.  I'm just glad I was able to get it (and the other one) back now that I can afford to.  Especially since I regretted selling them both until I bought them back.  Don't think I mentioned it but I traded a 2006 Honda CBR1000RR for it.  The friend it was stolen from didn't want to deal with it so he gave it to me.  The RR had been questionably 'modified'.  I traded the bike and labor to repair the RR for the YSR50/80.  The friend that had the YSR paid for the RR parts to get it back to snuff and street legal.  A good friend once told me that motorcycles aren't about money, but how they make you feel, the emotion they evoke.  That's my YSR's.  Good memories of my track days.  I'm to big to ride them now, so they're really for my wife to ride.  For me they're a part of my life that bring back all kinds of great memories.  Plus, part of the deal is that I get to ride the RR for a month  8)

[m in sc]

i actually put a dt100 motor in an rx50. was awful. but def faster.  much better as a DT100 total.

[Diablo007]

@m

So you're saying that I should consider fixing the DT up?  Title would be difficult to obtain though.  Hawaii isn't exactly nice about  that.  I'd have to track down the previous registered owner or petition a judge for the title.

[Djg8493]

Vermont should work for you in Hawaii, I looked into it a few years ago for my brother as he lives there and was running into a title issue and while he decided not to try it I believe everything I read they should reissue a title based on a Vermont Registration.

If you have the YSR80 engine I agree it is worth running that and trying to fix up the DT as well.

[m in sc]

^ agreed

[Diablo007]

@Djg8493
I emailed HPI.  Their reply was: '...base plate 120 mm, will be the set 210k072 or inner rotor /dirtbike only 068K072...'

The Vermont title thing may work.  I have an acquaintance that went that route for his HMMV, City and County of Honolulu will not honor the title.  I forget what the reasoning was.  I have called and spoken with the head of the DMV, she told me that I will have to bring a letter from the Vermont DMV on their letterhead stating they do not issue 'titles' for vehicles that old, as well as the registration.  I have notes somewhere from that conversation.  That was years ago though.  I was looking to title my Honda Z50A's.  I'll look into it again.  If you have any tips for getting that paperwork submitted to Vermont let me know.  It would be greatly appreciated.

[m in sc]

http://www.2strokeworld.net/forum/index.php?topic=124.0

[Djg8493]

@Diablo007, I sent you a PM.  I can point you to the specific Vermont Documents and what they need if you like.  Too funny that the title issue for my brother was also for his HMMV

[Diablo007]

Thanks 'm' and 'Djg8493'

I've known about the Vermont title thing for a while.  Hawaii is an interesting state.  Other counties in Hawaii probably would accept the 'Vermont' route.  'City and County of Honolulu' though I'm not so sure.  I have a friend who bought a KTM 'Super Moto; built from a dirt bike on while he was on Mau'i.  Brought it back to O'ahu and the City and County of Honolulu would not honor the title.  The motorcycle is rotting away now.  I also knew an US Army Major who also bought a KTM 'Supermoto' on Mau'i.  The title was also not going be honored on O'ahu.  He raised so much hell at the DMW in Wahiawa that he eventually was able to obtain a title.  He never did tell me all the details.  My dune buggy was brought into Hawai'i via the island of Kaua'i by a previous owner, as a lot of them are, I'm guessing because it's easier.  I'll add to the thread 'm' referenced regarding all of this as I move forward.  I know of at least two other 2-stroke fanatics on O'ahu that probably will be interested.