Category Archives: 2 wheeled

Modifications to 2 wheelers, all shapes and sizes

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Wrist Pin Nightmare

1978 CB400T Hawk with siezed engine.

 

Wrist pins were locked up solid to the connecting rod. Only one option, cut the damn pistons off.

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The first asshole tried using an air hammer to push them out, and mushroomed the pin to the rod.

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 Cut the pins down as much as possible.

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Hillbilly clamp press

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 1 hour later,

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Rod ends look like shit now. Hopefully I can reem them out and get a decent surface back.

Cleaned it up with a little oven cleaner.

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Could have been worse I guess.

CB125 Street Tracker

CB125 Street Tracker build Part 1

Picked up a stock 1975 CB125 with low compression and a junk front end.

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Stock, unmolested CB125

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I decided to build a street tracker with the stock 125 engine modifed as much as safely possible.

Sourced this145CC cylinder and piston kit for a cb145, which is a euro version i guess? Bored cases to accept the bigger cylinder and it worked out perfect.

Next was the head, I used the head from an 86-87 ATC200X, milled .080″. This is too much! I had to cut a lot of material from the head and the piston for clearance.

In order to use the stock ignition system, you have to cut the end of the camshaft off. You want to cut the cam where the machined groove is,about 3/8″ from the end, cam chain side. Then you can assemble it like it was still stock.

Ordered this chinese knock off of an XR200 carb with throttle cable and K&N filter, and changed the main jet to a 75.

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CB125 ATC200X ( xr200 ) Head and Carburetor

I ditched the stock muffler and went with an Emgo ,
type but it iwas made for a larger diameter head pipe, so I welded a piece of 1-1/4″ pipe to it so I could get the larger diameter needed.

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More to come.

CB125 Street Tracker
CB125 Street Tracker build

 

ST90 Lifan engine swap

1975 ST90 with the weak stock engine.

 

as we picked it up
as we picked it up

 

A 4-speed manual clutch with the provisions for an oil cooler was purchased from ebay smilar to this 125cc Lifan

The ST90 engine mounts to the frame with 4 bolts, instead of the usual 3 bolts that the other Honda horizontal engines mount with (CT70,XR50).

 

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The lower rear bolt holes can be used with a spacer, I made brackets that bolt to the engine with a hole to match the frames stock mounting hole.

 

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Exhaust is a custom bent 1-1/4″ Stainless steel header matched to a ZZZ muffler.

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Position of the oil cooler is a bit of a problem. The best and cleanest location is to mount it directly in front of the head using stand offs. We welded 7mm X 1.0 thread nuts to one side ofa 3/8″ tube, and an M6 nut to the other, and simply bolted the cooler to it.

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more to come

 

PW 50 Restoration

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Picked up a beat Yamaha PW50 for a couple hundred bucks off craigslist. Everything was trashed and needed painted at the least.

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I picked up this cheap complete top end kit with new head, cylinder, and piston, for less than price of factory gaskets.

I also decided to go with these brand new set of front fork tubes instead of reubuilding the stock pieces.

At this point you will have a brand new bike for a fraction of the cost. New plasticis available if yours is in bad shape, I chose to sticker up the factory plastic to keep the cost down.

 

PW50 Finished
PW50 Finished