1974 Yamaha DT100A Project

Diablo007 · May 22, 2021, 03:05:11 AM

HPI ignition arrived and I finally had time to install it. Plate and rotor installed easily. Had to space the coil away from the frame as it was hitting. Used the mount sent with the kit and a couple of washers. I'll look for some spacers, or make them later. Haven't had time to time the ignition yet, I'll post about it when I do. I'm really impressed with the quality. The only thing not included with the kit was the plug cap. I ordered the kit through treatland.tv. They're pre-sale support was amazing. This was my first kit of this type. They answered all of my questions and helped me figure out everything I needed to convert the system from 6V to 12V. May sound easy to some of you, but I had concerns about what type of regulator/rectifier to use and how to wire it. They pointed me to the correct unit, which they carry, and the instructions for wiring it. I haven't wired or tested it, but with the quality of service they've provided so far I'm confident it will work. Looking forward to converting the system to 12V.

Diablo007 · May 24, 2021, 03:10:21 AM

Kit didn't come with a plug cap...should I use a cap with a resistor or not?

Djg8493 · May 24, 2021, 04:40:16 PM

Glad it is going well, I'll be following to see how it runs, it may encourage me to get mine running and swap it in my YSR.

Diablo007 · July 14, 2021, 02:43:06 AM

Found an NOS steering lock in the shop and decided to install it. Realized the lock in the motorcycle didn't just 'pop' out when the face plate was removed. Looked at the NOS one and realized it had to pick the lock to remove it. Took me longer to fashion the lock picks than to pick the lock. Make a note of that; if the steering lock was that easy to pick the ignitions will be just as easy. Though with the ignition just cut the ground wire...

Diablo007 · July 14, 2021, 02:53:29 AM

Had to relocate the CDI to get things to fit. Timed and fired up the engine. Awesome!!! Probably wishful thinking but it sounded peppy'er.

Diablo007 · July 14, 2021, 03:06:42 AM

OK, updates are a little out of order. I did fit the oil tank and bleed the system before firing up the engine. Some pics are during fitment but not a lot changed between the fitment and the final install... Oil tank was found in the shop with a pair of 'Nimrod' hubcaps. Yes, 'Nimrod' hubcaps. Google 'Nimrod camper'. No idea how they made it to Hawaii. I have no idea what the oil tank came from but it looks as cool as I hoped it would. Was originally going to use it on a minibike but this is much better.

I still have to fit the wiring harness and connect the 12V regulator rectifier. I'm hoping the capacitor I picked up at a local electronics supply shop works as planned as I don't have much space. A battery is definitely not going to fit.

Diablo007 · July 14, 2021, 03:53:54 AM

Regarding the plug cap; emailed Treatland as the instructions didn't specify resistor or non-resistor. Treatland seemed to thing the instructions said non-resistor so that's what's currently installed. I'll post regarding that if I run into problems.

Current parts needed/wanted:
Gas cap and lock; anything for a '74' - 75' DT100 - DT 350 should work. PM me if you have parts you're willing to sell.
Top and bottom triples for a DT125A or equivalent. I have forks left over from another project, just need the triples. Not only are the fork tubes cheaper they offer more in springs and such.

Clem710 · July 16, 2021, 01:34:26 AM

Just so happens I just picked up one of these in similar condition for a YSR swap and have been meaning to list up the rest of the machine here. Think mine is 74 as well, greenish gold? Goldish green? Cant remember, we took it apart after we got it sparking and I left most of it in my buddys shop. Thanks for the motivational thread, GL with the build, I thought about it but I do like the YSR.

I should have whatever you need and many of the parts are in good condition, I'll make sure my email is good here and I may be able to get pics et. al. soon, parts coming for a pair of Vespas saturday and the YSR is next in line. Low, low prices for the 2SW peeps, I rarely get around to selling on Ebay, and things just go in boxes.

Djg8493 · July 16, 2021, 09:55:07 AM

Quote from: Clem710 on July 16, 2021, 01:34:26 AM
Just so happens I just picked up one of these in similar condition for a YSR swap and have been meaning to list up the rest of the machine here. Think mine is 74 as well, greenish gold? Goldish green? Cant remember, we took it apart after we got it sparking and I left most of it in my buddys shop. Thanks for the motivational thread, GL with the build, I thought about it but I do like the YSR.

I should have whatever you need and many of the parts are in good condition, I'll make sure my email is good here and I may be able to get pics et. al. soon, parts coming for a pair of Vespas saturday and the YSR is next in line. Low, low prices for the 2SW peeps, I rarely get around to selling on Ebay, and things just go in boxes.

Nice, Ill be interested when you get to the YSR swap, I also recently picked up one of these motor to swap into my YSR but that project will be down the road as my YSR is still running pretty good with the stock motor, I figure I will run it till it blows up.

Diablo007 · July 16, 2021, 02:19:51 PM

@dg8493; I in pretty much the same situation with the YSR's. Both run so there's no need for an engine swap at this point. The bike was pretty complete so I decided to go with popular opinion and get it on the street again. Once I have everything ironed out I'll go about trying to get the title. I have the paperwork for the Vermont title (thanks to a forum member for adding to the paperwork and info I had already found). There's also a way to stand before a judge in civil court here and petition for a title. Cost is about the same either way. I have time to think about it.

@Clem710; thanks for the reply. I'll get an email off to you, or at least a PM. I'm in Hawaii, so flat rate envelopes and boxes are the best way to go.

Diablo007 · July 19, 2021, 02:56:51 PM

@Clem710: PM sent, thanks

Diablo007 · August 19, 2021, 02:56:22 AM

HPI ignition works fine. Hooked up the Trail Tech TT150 regulator/rectifier per the instructions on treatland's website:
Black - Ground (- side or ground)
Red - Capacitor/Battery and lights (+ side)
Red/Yellow - Not used
Yellow 1 - input AC current coming from Stator
Yellow 2 - Also Ground

Hooked up to a 35V - 6800mF capacitor. Output was roughly 14.40V. Capacitor was still over 13.60V about 2 hours after disconnecting from system. Capacitor was picked up from a local electronics parts shop for about $7.00.

Capacitor is installed in the 6V battery from my YSR50 that was bad. I cut the top off the battery and gutted the insides, then soldered leads to the terminals, then soldered the leads to the capacitor, (+) to (+) and (-) to (-). Still need to epoxy the top back to the bottom of the battery. Idea is to keep the YSR looking stock but not have to worry about batteries going bad anymore. Pics attached. Need to drain capacitor before moving to the YSR. I have a capacitor somewhere for the DT100A that will be installed without a case as space is limited.

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1974 Yamaha DT100A Project