XR-125cc Mini Endurance Bike Project

BuckNut · 03-13-2018, 08:06 AM

Ok ok ok, Honda didn’t make a 125cc XR

.

Huge shout out to Gabriel and Everett Fox for their generous donation! My 16yo nephew will be very happy moving on from the little 70’s. My smaller kids are a bit dissapinted they can’t race it in TMGP but at least they can start learning a clutch.

What we have here was a unfinished project that had been shelved for a couple years. After a brief inspection, it appears the forks and swing arms will bolt onto our XR-70 carcass frame. If this works it will be a huge win simply because we have almost everything to make a complete bike.

Items in need:
1. Hydraulic perch and brake lever for front disk brake.
2. Complete clutch perch/lever/cable and assembly for case connection.
3. 100/90-12 Dunlop tire (used ok for the moment)

BuckNut · 03-13-2018, 08:37 PM

My nephew made some great progress today.

The swing arm and forks were a direct swap to the XR-70 frame.

The engine was also a direct bolt on to the XR-70 frame. The upgraded 12” (from 10”) rear wheel with drum brake slid in with some spacer modification.

Everyone has a job!

Progress!

GABRIEL · 03-13-2018, 11:13 PM

nice. is that a 12in front wheel too?

BuckNut · 03-14-2018, 06:13 AM

Quote:

Originally Posted by GABRIEL

nice. is that a 12in front wheel too?

Yes, the original rolling frame had 12” front with 10” rear.

upononer6 · 03-14-2018, 09:42 AM

Pretty cool the kids are learning this stuff at a young age. Good luck with the project.

BuckNut · 03-15-2018, 07:45 AM

Garrett keeps plugging away.

Carb has been cleaned.
Throttle tube and cable installed.
Exhaust installed.
Oil drained and replenished..
CDI box and wiring harness in place (requires connections).
Chain installed.
Kill switch installed.

Awaiting following parts.
Clutch perch/cable/bracket
Rear brake rear connection assembly
Hydraulic perch assembly
Fuel shutoff valve

Hopefully parts start rolling in on Monday while Carrie is at work.

JetBuilt · 03-15-2018, 08:20 AM

Those kids are learning so many valuable skills through this process, I'd have to imagine those skills will serve them for the rest of their lives. Basic mechanics, trial and error, patience, the value of hard work and the reward that comes with it...good job man, good job.

BuckNut · 03-15-2018, 07:33 PM

Some happy kids in the Miller house!

GABRIEL · 03-15-2018, 10:39 PM

This is one of the only moto threads I feel like I have seen on here in years.

hondarider77 · 03-15-2018, 11:24 PM

Bike is looking good!!!

mx6er · 03-16-2018, 11:59 AM

yellow wire is probably for lights. Is the stator wrapped on all poles or just one?

BuckNut · 03-16-2018, 12:30 PM

Quote:

Originally Posted by mx6er

yellow wire is probably for lights. Is the stator wrapped on all poles or just one?

Oh yea, good call!

Yes, all the poles were wrapped.

So on to another pressing issue. Nephew is having a tough time fitting the chain. The tire is tall and is hitting the front side of the swing arm. When he adjusts the tire back it runs out of adjustment. So he is inbetween chain links for proper adjustments.

Haven’t exactly seen his issue yet other than photo’s he is sending. His idea is to increase the size of the sprocket.

Anyone have a 15 tooth of this type? The spare XR-70 front sprockets have differnt spline pattern.

Or/And a 37 tooth XR-70 rear sprocket? The 37 tooth on the original 10” wheel won’t bolt up to the 12” wheel.

GABRIEL · 03-16-2018, 01:42 PM

I might have a sprocket or two for the front. have to check later when I get home.

BuckNut · 03-16-2018, 03:49 PM

Well, not exactly how the kids wanted to spend spring break, but they have definitely made the best of things.

Everyone was piled in the driveway waiting for me to get home. After multiple messages throughout the day, everyone was certain the bike was going to roll under it’s own power.

Making me proud! Great way to come home!

BuckNut · 03-16-2018, 07:00 PM

Brakes and a front tire and this beast is ready for a test n tune at the track!

BuckNut · 03-21-2018, 05:36 PM

MX6er,

Any ideas why this bike will only start in Neutral? I’m use to pulling in clutch and going while still in gear. Or thisvis just the way these engines are?

mx6er · 03-23-2018, 09:19 AM

It is the design of the clutch/kickstart mechanism and how they are placed. My 125 luckily starts in any gear with the clutch pulled in.

BuckNut · 03-23-2018, 07:27 PM

Tires, brakes and clutch done!

FoxRider · 03-28-2018, 04:44 PM

I'm just now finding your thread. Thanks for all the progress pictures from along the way! When is the first track day?

BuckNut · 04-01-2018, 08:49 AM

Shake down test yesterday.

Still have some work to do. First issue was on throttle response with a huge delay. Garret moved the carb needle up one position which solved apex exit response.

2nd issue is the front tire out of true. The bouncing basketball effect inspired zero confidence in pushing ANY types of limits.

3rd issue, this bike back fires like a after off throttle from high speeds. Anyone have suggestions?

03-13-2018, 08:06 AM	#1
BuckNut Bye, Felicia! Join Date: May 2016 Location: Houston Feedback Rating: (0) Posts: 4,510 Bike(s): A Few	XR-125cc Mini Endurance Bike Project Ok ok ok, Honda didn’t make a 125cc XR . Huge shout out to Gabriel and Everett Fox for their generous donation! My 16yo nephew will be very happy moving on from the little 70’s. My smaller kids are a bit dissapinted they can’t race it in TMGP but at least they can start learning a clutch. What we have here was a unfinished project that had been shelved for a couple years. After a brief inspection, it appears the forks and swing arms will bolt onto our XR-70 carcass frame. If this works it will be a huge win simply because we have almost everything to make a complete bike. Items in need: 1. Hydraulic perch and brake lever for front disk brake. 2. Complete clutch perch/lever/cable and assembly for case connection. 3. 100/90-12 Dunlop tire (used ok for the moment)
	__________________ The Real Troll Brostien, playing them like a fiddle. MH Member: "The hate group quit posting because of you". Me: Hold my beer...

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03-13-2018, 08:37 PM	#2
BuckNut Bye, Felicia! Join Date: May 2016 Location: Houston Feedback Rating: (0) Posts: 4,510 Bike(s): A Few	My nephew made some great progress today. The swing arm and forks were a direct swap to the XR-70 frame. The engine was also a direct bolt on to the XR-70 frame. The upgraded 12” (from 10”) rear wheel with drum brake slid in with some spacer modification. Everyone has a job! Progress!
	__________________ The Real Troll Brostien, playing them like a fiddle. MH Member: "The hate group quit posting because of you". Me: Hold my beer...

03-15-2018, 07:45 AM	#6
BuckNut Bye, Felicia! Join Date: May 2016 Location: Houston Feedback Rating: (0) Posts: 4,510 Bike(s): A Few	Garrett keeps plugging away. Carb has been cleaned. Throttle tube and cable installed. Exhaust installed. Oil drained and replenished.. CDI box and wiring harness in place (requires connections). Chain installed. Kill switch installed. Awaiting following parts. Clutch perch/cable/bracket Rear brake rear connection assembly Hydraulic perch assembly Fuel shutoff valve Hopefully parts start rolling in on Monday while Carrie is at work.
	__________________ The Real Troll Brostien, playing them like a fiddle. MH Member: "The hate group quit posting because of you". Me: Hold my beer...

03-15-2018, 08:20 AM	#7
JetBuilt Repeat Offender Join Date: Nov 2005 Location: ShoreAcres Feedback Rating: (15) Posts: 12,725 Experience: 10+ years Bike(s): 1950 Chevy Deluxe 1980 Honda CT70 1987 Kawasaki 650SX 1996 Honda Z50	Those kids are learning so many valuable skills through this process, I'd have to imagine those skills will serve them for the rest of their lives. Basic mechanics, trial and error, patience, the value of hard work and the reward that comes with it...good job man, good job.
	__________________ I understand the consequences of my actions prior to engaging in those actions. . .there are certain situations in life where the risk is totally worth the reward.

03-13-2018, 11:13 PM	#3
GABRIEL Senior Member Join Date: Jan 2007 Location: SW/SE Houston Feedback Rating: (14) Posts: 7,501 Experience: 1-3 months	nice. is that a 12in front wheel too?

03-14-2018, 09:42 AM	#5
upononer6 Senior Member Join Date: Jun 2006 Location: league city Feedback Rating: (0) Posts: 3,143 Bike(s): 2004 yamaha r6 2000 Honda XR50	Pretty cool the kids are learning this stuff at a young age. Good luck with the project.

03-15-2018, 07:33 PM	#8
BuckNut Bye, Felicia! Join Date: May 2016 Location: Houston Feedback Rating: (0) Posts: 4,510 Bike(s): A Few	Some happy kids in the Miller house! YouTube (Short URL)
	__________________ The Real Troll Brostien, playing them like a fiddle. MH Member: "The hate group quit posting because of you". Me: Hold my beer...

03-15-2018, 10:39 PM	#9
GABRIEL Senior Member Join Date: Jan 2007 Location: SW/SE Houston Feedback Rating: (14) Posts: 7,501 Experience: 1-3 months	This is one of the only moto threads I feel like I have seen on here in years.

03-15-2018, 11:24 PM	#10
hondarider77 Senior Member Join Date: Sep 2007 Location: Cypress Feedback Rating: (0) Posts: 4,163 Experience: 10+ years Bike(s): 2007 cbr1000rr 2005 crf450r 2005 crf150f 2005 crf150f tarded 2008 r6	Bike is looking good!!!

03-16-2018, 11:59 AM	#11
mx6er Senior Member Join Date: Jun 2007 Location: SE Feedback Rating: (2) Posts: 2,778 Bike(s): TL1KR street legal xr50	yellow wire is probably for lights. Is the stator wrapped on all poles or just one?

03-16-2018, 01:42 PM	#13
GABRIEL Senior Member Join Date: Jan 2007 Location: SW/SE Houston Feedback Rating: (14) Posts: 7,501 Experience: 1-3 months	I might have a sprocket or two for the front. have to check later when I get home.

03-16-2018, 03:49 PM	#14
BuckNut Bye, Felicia! Join Date: May 2016 Location: Houston Feedback Rating: (0) Posts: 4,510 Bike(s): A Few	Well, not exactly how the kids wanted to spend spring break, but they have definitely made the best of things. Everyone was piled in the driveway waiting for me to get home. After multiple messages throughout the day, everyone was certain the bike was going to roll under it’s own power. Making me proud! Great way to come home! YouTube (Short URL)
	__________________ The Real Troll Brostien, playing them like a fiddle. MH Member: "The hate group quit posting because of you". Me: Hold my beer...

03-16-2018, 07:00 PM	#15
BuckNut Bye, Felicia! Join Date: May 2016 Location: Houston Feedback Rating: (0) Posts: 4,510 Bike(s): A Few	Brakes and a front tire and this beast is ready for a test n tune at the track!
	__________________ The Real Troll Brostien, playing them like a fiddle. MH Member: "The hate group quit posting because of you". Me: Hold my beer...

03-21-2018, 05:36 PM	#16
BuckNut Bye, Felicia! Join Date: May 2016 Location: Houston Feedback Rating: (0) Posts: 4,510 Bike(s): A Few	MX6er, Any ideas why this bike will only start in Neutral? I’m use to pulling in clutch and going while still in gear. Or thisvis just the way these engines are?
	__________________ The Real Troll Brostien, playing them like a fiddle. MH Member: "The hate group quit posting because of you". Me: Hold my beer...

03-23-2018, 09:19 AM	#17
mx6er Senior Member Join Date: Jun 2007 Location: SE Feedback Rating: (2) Posts: 2,778 Bike(s): TL1KR street legal xr50	It is the design of the clutch/kickstart mechanism and how they are placed. My 125 luckily starts in any gear with the clutch pulled in.

03-23-2018, 07:27 PM	#18
BuckNut Bye, Felicia! Join Date: May 2016 Location: Houston Feedback Rating: (0) Posts: 4,510 Bike(s): A Few	Tires, brakes and clutch done!
	__________________ The Real Troll Brostien, playing them like a fiddle. MH Member: "The hate group quit posting because of you". Me: Hold my beer...

03-28-2018, 04:44 PM	#19
FoxRider Thumpitty thump Join Date: Jul 2012 Location: Katy Feedback Rating: (0) Posts: 365 Experience: 10+ years Trackdays: 10+ Bike(s): 1998 DR 650 2015 Honda Grom 2008 Pitster Pro 150 SM 1984 Suburban	I'm just now finding your thread. Thanks for all the progress pictures from along the way! When is the first track day?
	__________________ BRAP!

04-01-2018, 08:49 AM	#20
BuckNut Bye, Felicia! Join Date: May 2016 Location: Houston Feedback Rating: (0) Posts: 4,510 Bike(s): A Few	Shake down test yesterday. YouTube (Short URL) Still have some work to do. First issue was on throttle response with a huge delay. Garret moved the carb needle up one position which solved apex exit response. 2nd issue is the front tire out of true. The bouncing basketball effect inspired zero confidence in pushing ANY types of limits. 3rd issue, this bike back fires like a after off throttle from high speeds. Anyone have suggestions? YouTube (Short URL)
	__________________ The Real Troll Brostien, playing them like a fiddle. MH Member: "The hate group quit posting because of you". Me: Hold my beer...