J-Madd Posted February 26, 2007 Report Share Posted February 26, 2007 Jetting was ok according to the plug chop I did, but it locked up anyway. I was going down a gravel road halling ass 6th gear WOT, but I'd let out every 3 seconds or so and get back in it. I let out to take a curve and went back on the gas and it locked up. this happened to me on my other Cub motor over a year ago and I called it a cold seize, but this motor was warm and I'd went 3 miles or so when this happened. (172 mains in 39 mm pwks, temp 45, alt 300ft) I haven't tore the top end apart, but I know what I'll see. What are my options here. You can't just bore and hone these cylinders can you? If that was the case, I'd have this fixed in a couple days with a fresh bore and pistons. Please advise!!!! Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted February 26, 2007 Report Share Posted February 26, 2007 well as long as it didnt tear the nikasil up you can just throw new pistons and rings in it. just grab whatever size pistons it takes and go.. Quote Link to comment Share on other sites More sharing options...
J-Madd Posted February 26, 2007 Author Report Share Posted February 26, 2007 (edited) well as long as it didnt tear the nikasil up you can just throw new pistons and rings in it. just grab whatever size pistons it takes and go.. It had to tear it up to lock up a cylinder, right? (at least the other motor did) How thick is the nikasil? Is it possible to hone out the scratches, or bore it at all it the scratches are very deep (which I'm sure they are.) Edited February 26, 2007 by J-Madd Quote Link to comment Share on other sites More sharing options...
dajogejr Posted February 26, 2007 Report Share Posted February 26, 2007 Normally, you can just hone the nikasil to take off the glaze. But it's a crap shoot/guesing game right now... Take off the top end, see what it looks like. don't forget, locking up an engine is not nice on the crank/crank bearings, either... Quote Link to comment Share on other sites More sharing options...
J-Madd Posted February 26, 2007 Author Report Share Posted February 26, 2007 Normally, you can just hone the nikasil to take off the glaze.But it's a crap shoot/guesing game right now... Take off the top end, see what it looks like. don't forget, locking up an engine is not nice on the crank/crank bearings, either... This is a brand new crank/bearings. This sucks. Any idea why this would happen in the first place? Is it not safe to hold it WFO for a few seconds then let out and get back in the throttle? That's how I've alway ran down long straight roads, even on 4-pokes. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted February 26, 2007 Report Share Posted February 26, 2007 This is a brand new crank/bearings. This sucks. Any idea why this would happen in the first place? Is it not safe to hold it WFO for a few seconds then let out and get back in the throttle? That's how I've alway ran down long straight roads, even on 4-pokes. I wouldn't ride it for a LONG time at WOT in 6th, but...it should run at WOT for a little while like you're saying without locking up. Might be time to check the taper/bore of the cylinders...etc. Did you check it for clearances, squish, compression...etc. Running good enough fuel and oil, etc.? Quote Link to comment Share on other sites More sharing options...
J-Madd Posted February 26, 2007 Author Report Share Posted February 26, 2007 (edited) I wouldn't ride it for a LONG time at WOT in 6th, but...it should run at WOT for a little while like you're saying without locking up.Might be time to check the taper/bore of the cylinders...etc. Did you check it for clearances, squish, compression...etc. Running good enough fuel and oil, etc.? Ring clearance was within tolerance, squish was 0.045", compression 180 psi running 108 octane Klotz fuel at 32:1 with super techniplate. These are (were) brand new cylinders. Edited February 26, 2007 by J-Madd Quote Link to comment Share on other sites More sharing options...
Animalman294 Posted February 26, 2007 Report Share Posted February 26, 2007 Well for it to happen to you twice you are doing something wrong. Are you sure both carbs are clean and not leaning out one side or the other...............? Quote Link to comment Share on other sites More sharing options...
J-Madd Posted February 26, 2007 Author Report Share Posted February 26, 2007 Well for it to happen to you twice you are doing something wrong. Are you sure both carbs are clean and not leaning out one side or the other...............? Different carbs were on the other locked up motor. Running a stock gas line on one carb, and a tad bigger line on the other both times, though, if that matters. I don't see the bowls running dry, with burping the throttle every 3 seconds or so, but I'm open to anything to not let this happen again. This was not the first time today that I'd halled ass a few miles, 3 seconds at a time, but it was a little cooler outside when it locked. I tried to post a pic of my plug chop before I rode today,but the file was too big. It was tan with at least 2mm band. Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted February 26, 2007 Report Share Posted February 26, 2007 I'd bet on sucking the carbs dry, especially if you are using the stock petcock setup. Get some billet bowls for your carbs and a pingel. Quote Link to comment Share on other sites More sharing options...
FireHead Posted February 26, 2007 Report Share Posted February 26, 2007 I'd bet on sucking the carbs dry, especially if you are using the stock petcock setup. Get some billet bowls for your carbs and a pingel. I agree to the point that I am pretty sure that is what happened. :thumbsup: Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted February 26, 2007 Report Share Posted February 26, 2007 shouldnt need billet bowls...a pingle should do just fine... but then again whats billet bowl if it saves you from another locked up motor ???? Quote Link to comment Share on other sites More sharing options...
J-Madd Posted February 26, 2007 Author Report Share Posted February 26, 2007 (edited) I have a pingel. Surely I couldn't have sucked the bowls dry. But if that's what happend I'm done riding this thing on long roads. I'll stick to drag racing instead of riding down long roads, but it was fun going 90+ on gravel. Edit: I thought the pingel was listed in my sig, but it's not. Edited February 26, 2007 by J-Madd Quote Link to comment Share on other sites More sharing options...
I hate WYO Posted February 26, 2007 Report Share Posted February 26, 2007 PINGELS DONT FLOW THAT MUCH I RUN DUEL PEC IN MY TANK ON METH WITH NO PUMP STOCK BOWLS NO PROBLEM I WOULD THINK THAT YOUR OIL SEPARATED FOR YOUR GAS KLOTZS WILL DO THAT IN COLD WHEATHER AND YOU CAN TRY AND HONE THOSE CYLINDERS BUT IT NOT GOING TO PUT A DENT IN THE NIKASAL Quote Link to comment Share on other sites More sharing options...
FireHead Posted February 26, 2007 Report Share Posted February 26, 2007 I have a pingel. Surely I couldn't have sucked the bowls dry. But if that's what happend I'm done riding this thing on long roads. I'll stick to drag racing instead of riding down long roads, but it was fun going 90+ on gravel. Edit: I thought the pingel was listed in my sig, but it's not. The other part of the equation way have to to with you gas cap. The stock caps and some of the cheaper aftermarket caps do not relieve the negative pressure fast enough and thus limit the vlow of gas out of the tank. :thumbsup: Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.