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Yes, those are 16" wheels. I used an Xingyue ITA YY150T (BMS Pathfinder 150) as a donor bike. The triple tree had identical dimensions in the bearngs and steering stem retainers.

(On a side note, the Roketa MC 54-150 only had 1400 miles on it and had been sitting up for the last 3 years due to engine failure. On the triple tree for the 13" wheel the bottom bearing was packed in grease but the top bearing had no grease. However the top bearing was still useable.)

After installing the 16" triple tree I had to grind back the steering stops about a half inch to allow for more radius in turning. This was a simple bolt in. All work was done with the body off the frame. the speedometer cable was the right length and fit the instrument cluster. The speedometer is reading 50 mph at actual 45 mph.

The engine was a little more difficult to install. A 16" wheel bike has a wider engine case than the standard GY6 engine. It took a 9 1/2" grade 8 bolt to hang the engine to the frame. The carb is a tight fit to remove unless you pull the shocks to allow the frame to lower thus rotating the engine hanger away from the carb.

After I ran the brake lines to the rear I finished servicing the motor, replaced the belt and rollers (using 14 gram) and secured the wiring harness. I then carefully put the body back making all connections secure. When I disassembled the bike I found that there were a lot of missing bolts and screws along with loose bolts. This bike appears to never have been serviced leading to the engine failure.

As for the 16" wheel donor bike, it was a parts bike with many body parts missing. However the engine was still functional so there was no costs for rebuilding it.

All in all, the bike runs good. I have to replace the carb because it has issues for idling properly. The 16" wheels give the bike a smoother ride and the wheel base is 10" longer. The ride is very stable. I really enjoyed test driving it this afternoon. Top speed is 59 mph according to my gps.

Cruiser you are correct, I now have to extend the center stand because I don't think I want to pack around shim blocks, LOL! I also had to re-mark the dipstick for the crank case fot a proper oil level. The geometry of hanging this engine in this frame has the engine at a higher slant.

I have 2 other 16" bikes, a Lance Phoenix 150 and a BMS Pathfinder 200. The Lance has the best ride and engine performance. The BMS is the strongest and fastest at 63 mph but has a horrible, cheap feeling ride.

I would think that the top priority is to get the oil up to the rocker arms first. Everything else becomes irrelevant when the engine seizes.

I have a Lance Phoenix 150 (ZN150T-18,150cc) and a BMS Pathfinder 200 (174cc). They are not rare scooters, just not as common as the standard GY6 bikes. This engine has a 57mm head bolt/stud arrangement. It also has a taller head (3"). Parts like the head gasket and cylinder gasket only seem to be available in the rebuild kits found at only one source on the big auction site. The rebuild kits are only for 57mm pistons. There are no over bore kits available for the GY6-B engines. If I were ever to rebuild the Pathfinder 200 I do not think I would be able to find 62mm top end parts. I have read that these type of parts are available in Asia but there is no distributors here in the states carrying them. Also, it is difficult to find variator weights for the CVT.

All in all, the 16" bikes are great to own, however replacement/spare parts are limited.

Thanks for your reply. I hope you take an interest in providing parts for 16" scooters.

75 degrees today in south Louisiana. Took my wife on a ride this afternoon for a couple of hours on our PST150-H. Engine is doing a lot better with the 29 tooth sprocket.

I bought a new #428 chain yesterday and installed it on the 29 tooth sprocket. The 100 link replacement chain was only $10. I opted for the higher quality $37 - 92 link chain because it has the o-rings in it. My brother said it would be more quiet and stretch less. I had to remove 4 links making it an 88 link chain with a 29 tooth sprocket. Because the chain was stiff the adjustment ended up being in the middle of the adjustment slot. I backed up each of the adjustment nuts with nylock nuts because I lost one due to vibration. The original chain was 80 links with a 24 tooth sprocket.

When I made a quick run on the bike it had lowered the rpms nearly 2000 rpms at 35 mph. When it stops raining and dries up some I will run it again to see what my top speed will be and at what rpms. It was 42 mph @ 7500 rpms. Hoping to see something like 50 mph @ 6500 rpms. I do no care to go faster than 50 mph on a trike and I did not want the engine screaming while doing that speed.

Many thanks to Alleyoop and Rapidjim for all their assistance in this project.

A motorcycle shop should be able to add to my chain, correct? Did you have to lengthen your chain when you changed sprockets?