Author Topic: ST90- Goldie's Mighty Green (Read 7077 times)

goldarrow · « **on:** May 17, 2015, 07:25:33 PM »

I've been wanting one of these and the ct70's since I was a kid, now my wish just came true.

Picked it up this past Friday after work from bike flipper in the area. Very beat condition.

Then got to work right away. Pics!

I think may be too many pics now...

And the fun began, Weekend went by, and here's how it looks.

And here's the problem

Cracked left side engine case! Hmm...

Stev-o · « **Reply #1 on:** May 17, 2015, 07:27:43 PM »

That was quick.

goldarrow · « **Reply #2 on:** May 17, 2015, 07:48:24 PM »

Quote from: Stev-o on May 17, 2015, 07:27:43 PM

That was quick.

This is when things get slowed down.

Trying to decide
1. Abandon the project because of cracked case
2. Repair the crack
3. Source another pair of cases and replace
4. Source new motor

mrbreeze · « **Reply #3 on:** May 17, 2015, 09:22:28 PM »

I like choices 3 &4 best. I never knew there was a 90.......only 70's. It shouldn't be too hard to come up with a motor or cases for that. Those little buggers are getting some good dollars.......the little 70's and trail 90's.

scottly · « **Reply #4 on:** May 17, 2015, 09:42:55 PM »

I've never seen a 90, either? Had a 70, and my buddy had one too, so we had a lot of fun "racing" in my back yard.

You might look for a cheap Chinese replacement motor, like Tugboat found for the C200 that won this years endurance race.

Tugboat · « **Reply #5 on:** May 18, 2015, 12:41:08 PM »

Lifan motor!!! Read my thread here about the Scrapper 24. We ran a [practically new] Lifan 125 for 24 hours straight and it performed beautifully. You can get the motor, intake, carb, CDI & harness for $280 SHIPPED on ebay or dratv.com or tboltusa.com.

goldarrow · « **Reply #6 on:** May 19, 2015, 06:55:27 PM »

Thanks guys. I looked into lifan or other Chinese motors, but none are bolt on due to locations of mounting bolts to frame. If ct70's or other trail 90's, no problem.

goldarrow · « **Reply #7 on:** May 19, 2015, 07:06:51 PM »

While thinking how far I'm going with this one, probably just gonna make a rider, not show bike, so got one of the forks cleaned up. Fork internal setup is same as the early 750's, just smaller

Stev-o · « **Reply #8 on:** May 20, 2015, 07:53:05 AM »

No way, this need to become a show bike! No expense spared....

Tugboat · « **Reply #9 on:** May 20, 2015, 10:51:41 AM »

They make motor mounting adapters for your bike. Do it!!
http://dratv.stores.yahoo.net/adchtob.html

honda_dog · « **Reply #10 on:** May 20, 2015, 12:28:08 PM »

Quote from: Stev-o on May 20, 2015, 07:53:05 AM

No way, this need to become a show bike! No expense spared....

I agree.

754 · « **Reply #11 on:** May 20, 2015, 03:06:41 PM »

Hey they make 190 cc for them..might need the adaptors..

goldarrow · « **Reply #12 on:** May 27, 2015, 08:16:00 PM »

How bout this one

HOT ROD!! BIG BORE + PERFORMANCE CAM!!

54mm high compression piston raising the displacement 20% to 107cc- the largest it can go.

Stev-o · « **Reply #13 on:** May 27, 2015, 08:46:20 PM »

grcamna2 · « **Reply #14 on:** May 27, 2015, 09:19:16 PM »

That's a cool little ST90 goldarrow.I'd install a 4 speed manual clutch big bore motor something like the S90;w/ a small engine it's great to have a manual clutch for powershifting

kap384@telus.net · « **Reply #15 on:** June 04, 2015, 01:14:13 PM »

My buddy has the exact same bike in minty condition. He got it for a steal. Sorry about your cracked case!

Stev-o · « **Reply #16 on:** June 04, 2015, 02:46:25 PM »

Update Goldie? Lost steam quickly, eh?

goldarrow · « **Reply #17 on:** June 04, 2015, 03:41:07 PM »

Quote from: Stev-o on June 04, 2015, 02:46:25 PM

Update Goldie? Lost steam quickly, eh?

Wait! What! No way!

Got small parts cleaned up and painted!

And waiting impatiently for the big ticket item to come in......

Quoted from the seller.....HONDA ST90 ENGINE - HOT ROD!! BIG BORE + PERFORMANCE CAM!!

This ST90 engine has been completely taken apart, soda-blasted, inspected and professionally re-assembled. It has a brand new 54mm high compression piston raising the displacement 20% to 107cc- the largest it can go. All seals and gaskets have been replaced with new as well as new fasteners. This engine has the stock Honda cylinder that has been professionally machined to match the piston. The rings have been gapped for top performance. The stock Honda head features a cast-iron combustion chamber and has been reconditioned with new intake and exhaust valves and a high-lift/long duration cam has been installed. There are no broken/cracked fins, bungs, mounting points, etc.

cbornotcb · « **Reply #18 on:** June 04, 2015, 03:59:28 PM »

You could always think outside the box Goldie ?

Tiny

goldarrow · « **Reply #19 on:** June 04, 2015, 04:17:57 PM »

Quote from: cbornotcb on June 04, 2015, 03:59:28 PM

You could always think outside the box Goldie ?

Tiny

Now THAT looks pretty interesting. What motor is that? And what's been done to it? Any info?

cbornotcb · « **Reply #20 on:** June 04, 2015, 04:59:31 PM »

Quote from: goldarrow on June 04, 2015, 04:17:57 PM

Quote from: cbornotcb on June 04, 2015, 03:59:28 PM
You could always think outside the box Goldie ?

Tiny

Now THAT looks pretty interesting. What motor is that? And what's been done to it? Any info?

2 different engines there, the top one was a CB125 which was modified to resemble (loosely) the CT110 engine, a sectioned #4 cylinder and head from a Yamaha FZR600 was grafted on, top speed thus far had been 87 mph
The 2nd pic is a CT110 with an extra 3mm stroke added, and topped with a CB125 head and barrel, good for 71 mph
Tiny

kap384@telus.net · « **Reply #21 on:** June 05, 2015, 01:15:13 PM »

Congrats on new engine!

Quote from: goldarrow on June 04, 2015, 03:41:07 PM

Quote from: Stev-o on June 04, 2015, 02:46:25 PM
Update Goldie? Lost steam quickly, eh?

Wait! What! No way!

Got small parts cleaned up and painted!

And waiting impatiently for the big ticket item to come in......

Quoted from the seller.....HONDA ST90 ENGINE - HOT ROD!! BIG BORE + PERFORMANCE CAM!!

This ST90 engine has been completely taken apart, soda-blasted, inspected and professionally re-assembled. It has a brand new 54mm high compression piston raising the displacement 20% to 107cc- the largest it can go. All seals and gaskets have been replaced with new as well as new fasteners. This engine has the stock Honda cylinder that has been professionally machined to match the piston. The rings have been gapped for top performance. The stock Honda head features a cast-iron combustion chamber and has been reconditioned with new intake and exhaust valves and a high-lift/long duration cam has been installed. There are no broken/cracked fins, bungs, mounting points, etc.

goldarrow · « **Reply #22 on:** June 11, 2015, 06:16:07 PM »

Came home from work, and found big heavy box sitting by the front door, So here's the motor!

And 15 minutes later

goldarrow · « **Reply #23 on:** June 14, 2015, 06:14:49 PM »

My 2 yr old son is so eager to ride this

Stev-o · « **Reply #24 on:** June 14, 2015, 06:30:28 PM »

Well c'mon, get it running so he can ride!

grcamna2 · « **Reply #25 on:** June 14, 2015, 07:29:20 PM »

Had that bike out yet?

goldarrow · « **Reply #26 on:** June 24, 2015, 09:19:30 PM »

Let there be light AND life......this little bugger runs!

grcamna2 · « **Reply #27 on:** June 24, 2015, 10:12:01 PM »

How's it running? does it need a more free-flowing exhaust or is the stock pipe good ?

RAFster122s · « **Reply #28 on:** June 24, 2015, 10:25:09 PM »

No way the stock pipe is going to be able to keep up, or, I should say that the muffler would. Definitely going to need some free flowing exhaust to not choke the performance potential out of it.

goldarrow · « **Reply #29 on:** June 26, 2015, 08:44:44 PM »

Honestly I do not know what to expect out of these little 89cc motor, let alone bored out to 107cc (as the seller claimed it to be), but the kids, wifey and I are having a blast! Throttle and exhaust feels just fine riding around the neighborhood.

goldarrow · « **Reply #30 on:** June 26, 2015, 08:51:00 PM »

Here's vid
http://s1061.photobucket.com/user/goldarrow/media/D1B03902-1454-4BC5-9922-99AAB006745C_zpsvyaeo1rz.mp4.html

Stev-o · « **Reply #31 on:** June 26, 2015, 09:13:03 PM »

Looks good, Goldie! But you need one of these...

http://www.ebay.com/itm/HONDA-ST90-ST-90-BRAND-NEW-SEAT-COVER-HIGH-QUALITY-A08-/270999681744?hash=item3f18d6fad0&vxp=mtr

goldarrow · « **Reply #32 on:** June 26, 2015, 09:51:10 PM »

Actually need this but ran out of funds. I even have to steal gas out of my 750F'er and put in this little bugger! http://pages.ebay.com/link/?nav=item.view&alt=web&id=191609764077&globalID=EBAY-US

Original seat pan is rusted out.

News:

Author Topic: ST90- Goldie's Mighty Green (Read 7077 times)