Freshman Rider
Currently Offline
Posts: 57 
Likes: 7
Joined: Oct 8, 2014 12:52:11 GMT -5
|
Post by jc on Mar 19, 2016 3:33:52 GMT -5
Well......after 6000 miles of commuting, the CPI GTR 150 engine gave up the ghost. I got it home in my truck and drained the oil. The 150 mile old oil was thick and black. And this was in the oil screen...  www.flickr.com/gp/23905218@N04/Cv1jB6I haven't torn down the engine yet. I'm researching either rebuilding the 150 with a big bore kit or junk it and find a 250 motor that will fit or be made to fit. |
|
|
|
Post by wheelbender6 on Mar 19, 2016 14:17:41 GMT -5
I would consider the debris in the oil screen to be a cause for concern. Stuffing a CBR 250cc mill into a Grom frame has been done. Groms use a chain so they don't have to concern themselves with CVT compatibility. Stuffing a 250cc engine and CVT into your scoot will be more difficult.  |
|
|
|
Post by oldchopperguy on Mar 19, 2016 16:52:31 GMT -5
JC,
Have a bone on the Old Chopper Guy...
You might consider looking for a 250 scoot instead of attempting to swap a 250 into your 150 frame. After 7 years, I finally moved from a Chinese 150 to a used Kymco 250 and have been EXTREMELY happy with it for 2 years.
I found the 250 scooter, being engineered as a 250 from the factory, has almost EVERYTHING heavier-duty than the 150's; frame, brakes, CVT, electrics... and of course, the 20 or so horsepower engines. My old Grandvista is totally out-of-date compared to new scoots, but it's still light-years ahead of the typical Chinese 150 (including a 70 mph cruise, and near 80 mph top-speed). Yet it's only slightly heavier than a 150.
You now can find EXCELLENT used, and even new 250's from Italy, Taiwan and Japan for fairly affordable prices. One of these would almost certainly be a better overall ride to a 150 carcass with a 250 shoehorned in. And, a WHOLE lot easier to obtain, license and insure... I believe you'd be rewarded with a faster, smoother, solid, NO-WOBBLE fast-stopping safe ride which you'd enjoy.
Just a thought to consider...
Ride safe!
Leo in Texas |
|
Freshman Rider
Currently Offline
Posts: 57
Likes: 7
Joined: Oct 8, 2014 12:52:11 GMT -5
|
Post by jc on Mar 19, 2016 19:00:28 GMT -5
I love the unique styling of this scoot which is why I would like to either rebuild the 150cc water cooled engine or find a 250cc watercooled scooter engine with mounting points that are close and fab up some brackets or something. This is the scoot flic.kr/p/yy4M1cI enjoy challenges and will learn from this project whether it works or not. |
|
|
|
Post by wheelbender6 on Mar 19, 2016 21:33:57 GMT -5
If you are attached to that scoot chassis, a big block kit is probably your best bet. Engine swaps can result in a perpetual parade of problems to solve.
|
|
Freshman Rider
Currently Offline
Posts: 57
Likes: 7
Joined: Oct 8, 2014 12:52:11 GMT -5
|
Post by jc on Mar 19, 2016 22:18:51 GMT -5
If you are attached to that scoot chassis, a big block kit is probably your best bet. Engine swaps can result in a perpetual parade of problems to solve. Any suggestions on where to find a big block kit? |
|
|
|
Post by wheelbender6 on Mar 20, 2016 7:38:52 GMT -5
|
|
|
|
Post by rockynv on Mar 20, 2016 8:07:13 GMT -5
No suggestions but you are the third CPI GTR owner I have heard of who has lost the motor. The other two who I know personally had the end of the crank shear off while they were riding. Getting a 250 scooter engine to accept a 17 inch tire will probably also be a problem not to mention the the additional weight for the engine mount to handle. Martin Racing was the source of CPI parts in the USA and they went Chapter 7 and were liquidated in 2014. www.dealernews.com/dealernews/article/martin-racing-performance-chapter-7-liquidation-auction-set-sept-9The only engine parts I have recently seen are for the 50cc 2 stroke CPI GTR 50. Its probably time to retire the bike as its an orphan here in the US. |
|
Freshman Rider
Currently Offline
Posts: 57
Likes: 7
Joined: Oct 8, 2014 12:52:11 GMT -5
|
Post by jc on Mar 20, 2016 10:38:49 GMT -5
No suggestions but you are the third CPI GTR owner I have heard of who has lost the motor. The other two who I know personally had the end of the crank shear off while they were riding. Getting a 250 scooter engine to accept a 17 inch tire will probably also be a problem not to mention the the additional weight for the engine mount to handle. Martin Racing was the source of CPI parts in the USA and they went Chapter 7 and were liquidated in 2014. www.dealernews.com/dealernews/article/martin-racing-performance-chapter-7-liquidation-auction-set-sept-9The only engine parts I have recently seen are for the 50cc 2 stroke CPI GTR 50. Its probably time to retire the bike as its an orphan here in the US. Even more of a challenge!  I can't seem to find a big bore kit for the water cooled 150. I have found a watercooled 200cc scooter engine in China if they'll sell me one. I've dound a new crank and cylinder kit here in the States so that will be my fallback plan if a new bigger motor doesn't work out. Next weekend I'm going to tear into the engine and see if I can deduce what actually went wrong. Keep any ideas y'all have coming, on direction s to go in! |
|
|
|
Post by rockynv on Mar 20, 2016 13:53:17 GMT -5
Gekgo and Mojo are advertising the CPI GTR 200 (really 152cc) for a silly $3,299 and the CPI distributor in Canada still appears to be doing business so they may be able to point you to parts. Here is the main CPI website: www.cpi-motor.com.tw/eng/company.htmE-mail:pwei@cpi-motor.com.tw |
|
|
|
New Rider
Currently Offline
Kymco Sento
Posts: 45
Likes: 0
Joined: May 7, 2013 1:24:44 GMT -5
|
Post by jjjoseph on Mar 26, 2016 3:49:49 GMT -5
Before you swap, check the motor mounts because they're VERY different from one size to the next. Within the same size, it's usually possible to swap, like most 50cc 4-strokes can be swapped from one make to another, and most 125-150cc engines can be swapped. But a 150cc can never fit into a 50cc frame without a total re-engineering. Check your options at www.scrappydogscooters.com/ (you can ask them questions) I got a complete generic engine from them about 6 months ago that fit exactly. Runs fine. Still I wouldn't recommend doing this unless you're comfortable with tools and have shop space. |
|
Freshman Rider
Currently Offline
Posts: 57
Likes: 7
Joined: Oct 8, 2014 12:52:11 GMT -5
|
Post by jc on Mar 26, 2016 21:23:53 GMT -5
Well the china link for a 200cc swap fell through so i am just going to rebuild this engine stock.
Finally got the rotor off, and crank out. The oil pump can only be turned with a wrench so this may have been what started the problems. New crank ordered from Scrappydogscooters. I'll probably get the top end rebuild kit for the new piston and a backup cylinder. I may just put the new cylinder on and play with boring out the used cylinder and increase the engine size a bit without needing to widen the case.
The project plan is taking shape.
|
|
Freshman Rider
Currently Offline
Posts: 57
Likes: 7
Joined: Oct 8, 2014 12:52:11 GMT -5
|
Post by jc on Mar 30, 2016 7:56:46 GMT -5
New crankshaft arriving today!!!
UPDATE! - Yay the crankshaft fits! Now I'm just waiting on the gasket set and oil pump and chain and shouldnt take much to git 'er back together!
|
|
Freshman Rider
Currently Offline
Posts: 57
Likes: 7
Joined: Oct 8, 2014 12:52:11 GMT -5
|
Post by jc on Apr 3, 2016 1:58:24 GMT -5
No reassembly of a chinese engine is complete without a sheared crankcase bolt!
Will have to split the case again and dig out the broken bolt. I will replace all case bolts with good quality, new bolts.
|
|
