CPI SM Supermoto 50

hi everyone I have just bought a cpi sm 50 2 stroke it starts and revs fine but when I'm riding it the thing just wont hit the power band any ideas ?

I have owned the so called CPI for near enough a year now and I have to say i wouldnt have bought any other bike. if you want to learn gears and you want to have fun, this is your bike.

I started out like the rest, passed my CBT and wanted something cool and different. When i bought my CPI, an 08 reg that had 4 previous owners and in excess of 8000 miles, i didnt really expect much from it but as i grew to know it and know biking i grew to love it. Mine was in pretty bad nick but reliability has not been an issue. Engine is a gem and the gearbox is ok. Couple of false neutrals hear and there and a gearbox leak but hey ho, its only a year. mine tops out at low 40s and takes an average amount of time to get there. they will do 45 mph all day at 10,000 rpm. they are outstanding and highly recomended!!!!!!!!

I have recently bought a 13 plate sm 50 and due to a warped head and white oil and petrol in the raidiator I fited a 70cc big bore kit. After running the bike in I'm now at 300 miles since the new head and barrel was fited and have discovered that there is now black oil in the radiator. Can anyone suggest why this might be ???

I got the bike off eBay a few months ago, The person who sold me the bike wasn't the most genuine person, The bike had a few problems what he didn't tell me about.

I got the problems fixed, New brake light switch, New indicators, New battery.

I then was riding it for about 2 weeks and i noticed another problem (Petrol leaking out of Carb, When i say noticed, It was pouring out the Carb.

I decided to put it in a bike garage they did some good work, Cleaned Carb, Added new fuel taps, ETC.

It runs great, Then i kind of overdid i rode it for about 6 hours in breaks of 10 minutes.. The spark plug went and i have now had to fix that.

I decided to spend a lot of money getting this bike to tip top condition.

New spark plug, New 21MM race Carb, 70cc Cylinder kit, Racing crankshaft, Race piston, Yasuni Race exhaust fully DE-Restricted.

The bike runs great and is very very powerful now. Like new (Full Rebuild)

Overall i wouldn't get this bike as all you get is problems. To get it reliable you have to replace half the parts with good parts (Aprilia ones)

it is not worth the trouble, Buy a either a Derbi, Aprilia, Yamaha.

Also the electrics are rubbish.

I was going along and my cpi sm50 07/08 and it just started vibrating from the engine so i don't use it now as i don't want the engine to fully muck up, the faster i go the more it vibrates but i am not sure why!!, if anyone might know why can you please give me a comment, i will chuck you some money into your paypal or send cheque or whatever if the problem is what you say it is, thanks

just wondering what the best peformance exhaust would be for this bike? just need to ,make sure that the exhausts will fit on the bike properley. anyway great bike would happley spend money on this. cpi sm 50(y) its a 2007 model if that matters about the exhauts

I love my cpi, i bought this from new and when it was restricted it was painfully slow. once i had my first check over on it i de restricted it very early, it was worth it the gears are alot longer and smoother will go between 55-60 but if a different exhaust would be added it would be even faster. had a couple of problems but nothing major. all in all a great first time bike.

Hi there, i've owned my CPI SM 50 2011 for roughly a month now as i got it gifted to me on my birthday.

I really enjoy the bike and it looks stunning, couldn't ask for much more even if i wanted to :)

i've noticed in the last couple of days that when im changing gear from 4th to 5th, or 5th to 6th- the gear seems to either jump out and rev or when changing up it seems to not go in gear properly and rev which you have to then have a second attempt at putting it into gear which seems to do second time round... but at this stage there is a que of traffic behind you on a 30 road and im only doing 25 -_-

wondered if anyone could help as i have no idea if its either teething problems as it has only done 200 miles or if the gearbox/transmission is mashed , getting quite worried :/

thanks

Lee F

I loved the look of this CPI SX 50, Great size six gears. Everything has gone wrong on it. Parts hard to get can use Aprillia RS 50parts and its a AM6 engine so look for those in the search for the parts I'm sure you will need if you buy one of these bikes. The back brake caliper to which I needed two over a few months were nearly £100. all parts expensive there is a good seller on ebay {scooters and bikes} They are helpful unlike The importer of CPI bikes, CPIMOTO they are unfriendly and little help and very over priced for parts. Sometimes takes 3 weeks to get parts to you. not much in stock I wrote to Tiwan where bike was made they were no good and don't sopply direct. Give this bike a miss. Its a nightmare.

The bike overall is good. When i bought the bike the first thing i found was it is a bit slower than the other 50cc geared bikes out there. The sm exhaust greatly reduces power and is under geard so i ran out of revs in 6th gear but only did a TRUE 45mph which is not that good. If your going to leave this bike standard steer well clear HOWEVER! if you upgrade the cylinder like i did, i fitted an airsal 70cc aluminium kit (all minarelli AM6 kits WILL fit the engine as is based upon the minarelli AM6 engine) and i also fitted a doppler er1 exhaust or any minarelli AM6 exhaust will do. The results are OUTSTANDING people, it now out accelerates both my mates 125cc 4 strokes and thrashes my mates aprilia rs50 with a polini 70 kit, still lacks in top speed but bigger front sprocket will solve this! If your a willing to spend £300 on these upgrades i guarentee you will be happy!

Fuel economy before i fitted the 70 kit was 85mpg and i ride it flat out all the time. Electrics are a bit shabby but again if you spend £20 on wire etc they will live up.