bansheeryder21 Posted October 11, 2012 Author Report Share Posted October 11, 2012 Are you at sea level? My timing is +6. I hope to have time today to change my jetting. I will post results as soon as I trouble shoot some more. Quote Link to comment Share on other sites More sharing options...
dave5.0 Posted October 11, 2012 Report Share Posted October 11, 2012 Last time I rode it I was actually around 5000'. Hoping to do some tuning in the next couple weeks. I'll be around 2500' doin that. I would think I'd end up a lil leaner than you up here if our porting is similar. My timing is at 5 but wanted to try jackin it up after I get the jetting lined out. Let me know where u end up. I think you should be close Quote Link to comment Share on other sites More sharing options...
bansheeryder21 Posted October 20, 2012 Author Report Share Posted October 20, 2012 Haven't had any time to trouble shoot any further. Our first desert trip is Nov. 2 and I hope to get this problem figured out. How many people think its an electrical issue??? Could it be a reed? What are the symptoms of a broken reed? I'm going to swap out electrical parts once more one at a time. If I switch everything out and it still does it I don't know what to do. Please guys please help if you can! Brand new HJR 421 cub and I can't even ride it! I'm depressed! Quote Link to comment Share on other sites More sharing options...
Paulie B Posted October 20, 2012 Report Share Posted October 20, 2012 I had the same problem at the track and I freeked out. I found out it was a plug starting to foul out on one side. I'm not a fan of the NGK caps. The ones I had made a really good click when popped on the plugs but felt loose after that? Maybe they were worn. I went back to stock style. When the stockers get loose a pair of vise grips gets them tight again. Quote Link to comment Share on other sites More sharing options...
bansheeryder21 Posted October 22, 2012 Author Report Share Posted October 22, 2012 @ride.race.live Leak down- no Reeds- no Plugs- grey Timing +6 Pick up Gap- .016 Carbs- clean and synced Quote Link to comment Share on other sites More sharing options...
mike0chek Posted October 22, 2012 Report Share Posted October 22, 2012 (edited) @ride.race.live Leak down- no Reeds- no Plugs- grey Timing +6 Pick up Gap- .016 Carbs- clean and synced could be a lean main jet, i dont like to see grey on my plugs, go up a few sizes and see if its still cutting out your top end Edited October 22, 2012 by mike0chek Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted October 23, 2012 Report Share Posted October 23, 2012 Ok, after seeing your first post and even the check list that you just made the one thing that jumps out at me is your plug color! 170 is pretty rich and you are getting grey plugs. Typically a sign of over heating. If I were you, I wouldn't dare ride that thing with out doing a Leak down test. You could try the brake cleaner or soldering torch gas around all the seals and gaskets while it's running, but a true leak down will be your best bet. Grey plugs mean bad news. Quote Link to comment Share on other sites More sharing options...
bansheeryder21 Posted October 23, 2012 Author Report Share Posted October 23, 2012 It's a dark wet grey. Not over heating, temp doesn't go over 160 because I'm not really riding it. I've gone from 168 mains up to 180 mains and does the same thing. It feels like an electrical cut off to the power band. I've checked for air leaks with carb cleaner spraying all around the intake, reeds, and carbs and no leaks detected. Here's what I'm going to do when I have time. Double check carbs, reeds, and check for leaks. Compression test. New plugs and gap and mag pick up gap. Check spark plug cap resistance.Swap out all electrical components one by one. Last thing will break down top end and see if everything looks normal. Probably some time this weekend or next week. I'm in the middle of rebuilding my Honda motor for a turbo and getting back in my car. Time is limited. Thanks everyone for the help so far! First trip is November 2. Quote Link to comment Share on other sites More sharing options...
jmillertime1148 Posted October 25, 2012 Report Share Posted October 25, 2012 It happend to me. Mine was a spark plug boot and coil. Avgas sucks dick. What are your thoughts on av gas? I know it's off topic sorry. Just curious. Quote Link to comment Share on other sites More sharing options...
RadarRacing Posted October 25, 2012 Report Share Posted October 25, 2012 Av gas for me has always ran much leaner in any bike. A bike on VP110 that needs 155 mains will need quite a few jets higher and not like near as much timing from my experience. Quote Link to comment Share on other sites More sharing options...
bansheeryder21 Posted October 28, 2012 Author Report Share Posted October 28, 2012 Okay just got done trouble shooting with Kevin H. Compression is good Leak down is good Swapped out coil, caps, wires, flywheel, stator, cdi, and harness. Nothing changed. 34mm PJ's w/52 pilot, 172 main. The bike starts right up, idles great, drives but will not rev out. Feels like a rev limiter. Im going to check the reeds and change carbs. If neither of those fixes the problem I'm at a lost for words. Kevin and I are stumped on this one. Quote Link to comment Share on other sites More sharing options...
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