Recent Posts

Pages: [1] 2 3 ... 10
Wolf Classic 150 / Re: Rear Sprocket Replacement - Alternatives?
« Last post by Syd on May 07, 2021, 11:22:17 PM »
Please resize you photos, they're waaaay too big!
Wolf Classic 150 / Re: Rear Sprocket Replacement - Alternatives?
« Last post by gavfistow on May 06, 2021, 06:06:19 AM »
Well, I decided to use the CB100N rear hub which will allow me to use the much cheaper Honda replacement parts.

I still need to true up the assembled wheel and then fit it.

Next question is where to source a sprocket cover and whether or not something from another bike might fit?

General Discussion / SYM, my Speedy Young Motor
« Last post by Thoppa on May 05, 2021, 10:34:14 PM »
How fast does she go mister? was a question I sometimes got asked on my Yamaha YZF many years ago, but it is not a question I expect to get asked on the SYM. But, just in case someone does ask, I need to be prepared right? :-)

So, I took out for a spin, got her warned up and then gave her WOT from a standing start onto {edited} for 2 miles, with no wind. So, I can say 130kmh on the GPS, that's 140kmh indicated, with maybe a little more with a new belt etc. She still has the K&N air filter but is running the standard exhaust - when she was fully tuned with a straight through exhaust she did 148kmh indicated, 135 on GPS. The calculation anomaly for the maths is likely tire diameter.

I also noticed that the "knock" noise the engine used to make when cold has gone, and the engine feels smooth or at least smoother, at all engine speeds too. I can't tell if the 250 camshaft has made any difference.

The next stage is to run her for month and see if she has stopped using oil, measure the compression pressure, and calculate fuel economy. 
General Discussion / Re: Changing cylinders - anyone done it?
« Last post by Thoppa on May 04, 2021, 03:54:29 AM »
And it sounds awesome with no exhaust!

EDIT - I though you meant that as a joke but I realised I might not have explained what I was doing clearly - a lack of pics cos this site does not make pics easy. So, I was pulling on the cam chain to rotate the crank and piston to tdc with the head off. It's not possible to pull on the chain with the head fitted - insufficient access. When the crank marking is as close to aligned in its inspection window as possible, and that is not as easy as it sounds, I fitted the head down the mounting bolts while pulling the chain and guides through the slot in the side of the head. With the the head in place and bolted down, the cam chain can be worked around the cam chain sprocket (a little tricky due to the limited access) and then the sprocket is bolted onto the end of the camshaft - so the camshaft, the sprocket, and the crank are all at their tdc markings. When you torque the bolts that hold the sprocket to the end of the camshaft, the sprocket will turn and then so does everything else. That's when it makes sense to not have the spark plug fitted. The last thing is to add the camchain tensioner, and then the head cover, then the engine goes back in the frame and then reconnect cooling pipes, rear brake, throttle body, fuel, airbox, electricals, exhaust, rear suspension, etc.

It's mostly following the servive manual but, as I worked out from the first failure, also spending time thinking about what the manual isn't saying so stuff like the crank marking and camchain tensioner don't create problems.

Anyway, still no leaks and she's running well. I read up on breaking in piston rings and the "no idle and varying throttle and engine speed" doesn't need that long apparently. So I'm going to take her for a blast tomorrow :-)
General Discussion / Re: Changing cylinders - anyone done it?
« Last post by Syd on May 03, 2021, 01:21:13 PM »
If you take the plug out, the engine turns much easier.
General Discussion / Re: Changing cylinders - anyone done it?
« Last post by Thoppa on May 03, 2021, 01:11:37 AM »
Thanks Syd and Tromper - I am feeling super good - the adventure seems to have a successful end... and no sign of oil or other leaks so far either! Cursing and skin loss are key!

The skin loss was from pulling the cam chain to rotate the crank so I could get TDC - it's actually a lot of effort in places and then suddenly turns very easily and spins past TDC. Quite troublesome! There was also a lot of cursing while trying to get the piston into the cylinder without damaging the rings. Both of those jobs took a lot of time to get right.

Second time round I also realised there's no need to remove the bodywork - just loosen screws so panels can move and that gives enough room to access electrical cables and connectors. I also tied the handlebars into a centre position so I could lift the body away like a wheelbarrow and the front wheel wouldn't wobble. Lifting the "wheelbarrow" up and over the back wheel seemed like a lot of physical effort but manageable even though I'm out-of-shape and the wrong end of middle aged.

Another tricky bit was realigning the frame with the engine and then getting the long mounting bolt to pass through - it still had to be lightly hammered through even when aligned.

Anyway, now I'm watching for leaks and if none, then I'll run her in for a couple weeks ... I'm looking forward to giving her some beans and see if that 250 camshaft has made an obvious difference. It has the same size and same lift as the 263 but I guess more duration for top end power and less bottom end.

Beer time I think. :-)
General Discussion / Re: Changing cylinders - anyone done it?
« Last post by Tromper on May 02, 2021, 10:01:20 PM »
Excellent.  You were probably below the critical loss of skin & cursing levels the first time.
Now smile and enjoy the ride.
General Discussion / Re: Changing cylinders - anyone done it?
« Last post by Syd on May 02, 2021, 08:48:13 PM »
Well done, Thoppa. "Smile, take full credit, & party 'til dawn to celebrate."
General Discussion / Re: Changing cylinders - anyone done it?
« Last post by Thoppa on May 02, 2021, 02:04:35 AM »
Smile, take full credit, & party 'til dawn to celebrate.

Congrats, & well done.

Hey Tromper, so now I'm celebrating - seems to have worked second time, with a new piston pin and new camshaft (from the 250) and lots of prayer and cursing and lost skin.

The difference this time was using the crankshaft timing mark to get as close to TDC as possible so I was sure the timing was as close to correct as could get it. I hope dead on. I also disassembled the camshaft chain tensioner by removing the spring before removing the tensioner from the cylinder. Then I could reset the ratchet on the plunger so when it was reinstalled, the plunger wasn't applying any tension to the chain. Then after that, fitting the sping and hearing the ratchet click through to apply the tension.

And so far so good - she idles sweetly from the get go, actually smoother than I can even remember. I ran her to get her hot enough for the fan to turn on ... and no issues.  I'll leave her overnight and see if there any leaks in the morning :-)
General Discussion / Re: 200 cc sym engine won't start
« Last post by Thoppa on May 01, 2021, 07:42:21 PM »
If you unplugged everything and then plugged everything back in and it started, I would guess it is a connection problem. I would ty unplugging and plugging back in one thing at a time to see if I can find which plug/connection is causing the issue.

Besides that, some stuff to check -
battery voltage
voltage at the starter solenoid
functioning starter solenoid
engine cranks but doesn't run
spark plug / coil and wiring / spark strength
fuel level
fuel pump relay
fuel hoses and vacuum tube
blocked fuel strainer
blocked / damaged evaporative emission control system
ECU cables
AC generator cables
loose connections
Pages: [1] 2 3 ... 10