JD Themed GT2A-S, 4 stroke

[knightscape]

Finally getting back to doing some work to my bike. Changed the saddle a while back and added a layback post from sportscarpat with a 25.2 to 27.2mm shim. This weekend I did the AGK airbox mod to the stock box. I bought a sheet of UNI fine foam, something like $11 shipped from Amazon, the black square is my stock filter, so this is enough for roughly a gazillion filters.

Oiled and put in place in the stock box:

Then hollowed out the internal fins and punched out some breathing holes into the cover:

The invisible part is I drilled out the jet to a 72 bit as per AGK's writeup. Took it for a ride and the throttle response was defintely a bit peppier, and it's not starving for fuel at the top end anymore, it will roll up to 8300 rpm, which I backed of of quickly since red line is 7800 on these. BUT, it's not starving at 7800 anymore, so that's sweet. Next up I need to do a proper plug chop on it to see how it's behaving, but it feels pretty good, so I'm hopeful I may be able to drop down to a slightly smaller gear soon.

Here it is with it's big brother:

 

[Rudz]

Great build. I love it.

 

[Trey]

How did I miss this?!

Awesome man! I intend to build one very similar.

Thanks for sharing.

Trey

 

[knightscape]

Thanks! It's been pretty solid. I commute to work on it on nice days, I've got about 250 miles logged on it this year.

 

[langolier]

Nice build, I love the theme looks great ! I'm going thru the same growing pains now that you were, Fixing all the weak links as they rear up. Was going to ride a little tonight ..... not. Spark plug cap has a bad connection (fell apart). Debating if my next build will be another 2 stroke or 4 thinking less issues with the 4 but it looks like you had pretty much the same issues. Thanks for sharing looks awesome. Enjoy !

 

[knightscape]

If I could rewind and do it all over again, I'd still pick the 4 stroke. However, I'd buy just a bare motor and buy the rest of the parts separate. Once I got the CDI worked out on the motor, the motor itself has been solid. It's never so much as hiccuped, starts first pull every time and idles clean, I think I have somewhere around 500 miles on it total. It's the rest of the original kit accessories that have given me grief, all the aftermarket parts I've used have been great.

 

[knightscape]

It's been a long time since I've checked in here or updated this thread. I just read through all of it again. I had a lot of fun working on this bike and a lot of frustration induced learning, followed by a few thousand happy miles with no major issues on this build. I just sold it last week to a guy who's wanted it for 3 years and I'm having a hoot of a time watching him update the build and make his own mark on the bike. I hadn't been riding it much, I started working on and riding full sized antique motorcycles so I could more reliably commute distance on 2 wheels. Been doing motorcycles for like 6 years now but it all started with this bike. So thanks for the ride folks!