125-200cc 165 ring end gap

Put 2.5 hours of WOT grasstrack on the new piston today. Broke her in real good!!! Seems all good, no leaks, feels right, rear brake worked a treat. Left the PJ at 1 turn out & think that's where it will stay. Did about 80km to reserve(dry sand & fairly up her!). Forget where rod was but it's half a turn richer than where it was. No spooge at all(dry black muffler) but to be expected riding it hard like that.

I'm currently running 12:48(13:52 ready to go on soon as 12 wears too quick!) but wouldn't mind a bit more top speed every now & then. Do 14t fit ok with BMP case savers, looks like it'd be close?!

Anybody run a 14t front sprocket on 125/144/165? Any issues with clearance?

I ran a 14t front sprocket on my 2012 165. It was fine.

PS I ran the 14t sprocket on an otherwise stock bike. Can't speak to whether it would clear the BMP case savers.

Hi Shawbagga,
Any detonation issues with our fuel and what fuel are you using. I am still having detonation issues with my 165. I may have to consult the master Walt again.?????

Mark

More than likely a timing issue, retard it a fraction.

Not that I've noticed Mark, Walt set squish at 1.5mm from memory before he sent it over. Run it on 98 & not too lean seems good.

Hopefully get some good life outta this piston after seizing my first after 32 hours(completely my fault) then the lining on cylinder failed & oring blew out on the second after 16 hours. It looked like detonation or something bouncing around in top end(pitting in head & piston) but may have just gotten too hot.

Walt got me back up & running. Confident this one will last otherwise I'm going back to 125. Fun bikes

When's everyone replacing rings on their 165's? Walt sent me a spare so was thinking around the 30 hour mark? It gets ridden pretty hard(well for a clubman!). It's got 18 hours on it now. I'm kinda anxious to tear head off to check piston too!

I'd be guided by the compression readings mate.
Mine started at 205psi as a reference point for you.
The general rule is do them when you've got around a 10% drop IIRC.

If that thing is still hauling your ass around shawry then it's fine!

I would put good money on the ring doing 50 plus hours before it wants changing if mine is anything to go by, even after 80 plus hours on one hardly saw any difference in the gap - was run on castrol A747

Mmmmm A747-exy but smells delicious!

I've got 60 hrs on mine, a few races and lots of WFO riding, and starting to feel like it's time. Compression test next, but I can feel the edge is gone and it doesn't pull as strong off the bottom.

Wow 60 hour's a long time on small single ringer! Let us know how you get on Steve. I might leave it to 40 hours

I know when I had my 165 - it wasn't running well and I checked the ring at 40 to 50 hrs and it had a really humungous gap - cant remember exactly now - I am not sure why that happened . From that experience Id check at 30 hours . Check the compression first

Just found Walts old post

http://www.cafehusky.com/posts/353258/

166 hours!!! I'm currently on 115 on 300's third top end & can feel it's lost power!

Twisted her tail again over the weekend and she didn't miss a beat. Def tearing it down soon though. 100 hours on the piston, so probably play it safe and send it back to Walt. Though if it looks good I may do another 30-40 hours on a fresh ring.