Baja Blitz Motor Upgrade

Charles S

Charles S

#61
#61
First, mount the wheel the right way and see what you have, the hub may be offset. Swapping the spacers would shift the wheel 7mm and I doubt you'd be able to align the caliper with the rotor. If the heads of the cap screws still hit the frame with the wheel mounted correctly, there are a few things you could do: Place a flat washer between the axle spacer and the frame. Replace the socket head cap screws with button head cap screws (they are typically lower profile). Counterbore the bolt holes in the sprocket adapter to partially recess the heads.

http://www.bajamotorsports.com/file...nsim Doodle Bug 96cc Mini Bike (VIN LUAH).pdf

You posted while I was working on this so I know you flipped the wheel, don't feel like editing this post.
 
baj0411

baj0411

Member
#64
#64
Charles S said:
The clutch can work either way. The original clutch was probably mounted with the sprocket outboard. The 212 is a much larger/wider engine and you will be able to center the engine better with the sprocket inboard.

Sprocket outboard
https://www.oldminibikes.com/forum/index.php?media/modded-doodlebug.3807/

Sprocket inboard
https://www.oldminibikes.com/forum/index.php?media/minichopper_029.22449/
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The key groove on the clutch I bought doesn’t go all the way through, but it says it mounts both inboard an out. My guess is that I have to remove the key on the shaft that came with the predator motor, slide the clutch on, and then slide they key into the groove on the shaft and clutch?
 
Charles S

Charles S

#65
#65
baj0411 said:
The key groove on the clutch I bought doesn’t go all the way through, but it says it mounts both inboard an out. My guess is that I have to remove the key on the shaft that came with the predator motor, slide the clutch on, and then slide they key into the groove on the shaft and clutch?
Click to expand...
Yep, may need to trim/shorten the key (if it protrudes beyond the end of the shaft). FYI: The "groove" is a keyway (clutch) or keyseat (shaft).

Keyway-lovejoy.jpg

https://en.wikipedia.org/wiki/Key_(engineering)
 
Fat Tony157

Fat Tony157

Active Member
#66
#66
Remove the key from the crankshaft. Slide the clutch on with the sprocket facing the inside, then line up the keyways and slide in the key. If the key sticks out and is too long, just mark it and cut it down a bit with a hacksaw or dremel so its flush. Washer, bolt and you are ready to go.
 
Fat Tony157

Fat Tony157

Active Member
#67
#67
The engine mounting plate you ordered has tons of adjustment. You can put the engine wherever you want so it lines up with the rear sprocket. Biggest issue with flipping the spacers is making sure the brake caliper bolts on and aligns with the disc.
 
baj0411

baj0411

Member
#69
#69
Thanks for the help! Already have the clutch slipped on with the key. I did have to cut off about half of an inch or so, but the clutch is now ready to be bolted on. All of you have been such lifesavers! Pulling these rookie mistakes.
 
Charles S

Charles S

#73
#73
baj0411 said:
Thanks for the help! Already have the clutch slipped on with the key. I did have to cut off about half of an inch or so, but the clutch is now ready to be bolted on. All of you have been such lifesavers! Pulling these rookie mistakes.
Click to expand...
TU.jpg

You're doing fine. Your next one will be easy!
 
baj0411

baj0411

Member
#75
#75
Charles S said:
You can see CT100U pegs in these pics.

https://www.oldminibikes.com/forum/photopost/data/500/IMG_20170405_140953610.jpg

https://www.oldminibikes.com/forum/photopost/data/500/IMG_20170405_133542213.jpg

This is what my pegs look like. I think I have an older model DB. Additionally, the clevis brackets welded on my bike are vertical, which was the worst design flaw since every other design two-wheel powered machines have them mounted horizontally.

IMG_3217.jpg

I found these and bought a pair and thought I would try to see if they would work. The pegs rotate 360 degrees so the clevis bracket problem is solved. It will just a matter of the male clevis fitting into the clevis bracket and possibly doing some minor fabrications like adding short spacers or washers to remove any slack.
http://rover.ebay.com/rover/1/711-5...0001&campid=5335845805&icep_item=312926631896
1589302127645.png
Click to expand...
 
Charles S

Charles S

#76
#76
Most motorcycles have them pivot at an angle so the peg will swing up and to the rear when/if the peg touches down, a time proven design. If they swung straight up, they would tend to break when dragged.
 
DaddyJohn

DaddyJohn

Well-Known Member
#77
#77
Charles S said:
Most motorcycles have them pivot at an angle so the peg will swing up and to the rear when/if the peg touches down, a time proven design. If they swung straight up, they would tend to break when dragged.
Click to expand...
It's weird... Some Baja DB30's had toothed dirtbike-style pegs that swung up and to the rear, while others had pretty identical looking pegs that just pivoted horizontally to the rear. I've had both, which is the only way I know about this variation. Photos of the Coleman, which is largely identical to the Bajas, have different looking aluminum full-body pegs that look to pivot up and back. I think baj0411 has the horizontal-swinging Baja pegs.
 
Charles S

Charles S

#78
#78
DaddyJohn said:
It's weird... Some Baja DB30's had toothed dirtbike-style pegs that swung up and to the rear, while others had pretty identical looking pegs that just pivoted horizontally to the rear. I've had both, which is the only way I know about this variation. Photos of the Coleman, which is largely identical to the Bajas, have different looking aluminum full-body pegs that look to pivot up and back. I think baj0411 has the horizontal-swinging Baja pegs.
Click to expand...
I only linked the CT100U photos because it's pegs had been mentioned and I wanted the OP to see the differences, I wasn't inferring that they would work on his DB. I have a couple of CT100Us but don't have a DB to compare but I think the CT frame is smaller than that of the DB. An obvious difference is that the DB has an inboard rear axle while the CT's axle is mounted outboard. Even with the outboard axle, the CT's wheelbase is only 34".
 
baj0411

baj0411

Member
#79
#79
If I knew how to weld and had the equipment, I could have fixed the problem easily. I’m not doing any crazy riding, so I’m hoping they will work for my purposes.
 
DaddyJohn

DaddyJohn

Well-Known Member
#80
#80
Charles S said:
I only linked the CT100U photos because it's pegs had been mentioned and I wanted the OP to see the differences, I wasn't inferring that they would work on his DB. I have a couple of CT100Us but don't have a DB to compare but I think the CT frame is smaller than that of the DB. An obvious difference is that the DB has an inboard rear axle while the CT's axle is mounted outboard. Even with the outboard axle, the CT's wheelbase is only 34".
Click to expand...
I need to get a Cool-man CT one of these days...:)
 
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