| Author | Message | ||
     Cupcake_mike |
   Looks like I am going to be picking up a 1250 kit from nrhs this winter....and sending my heads (back) to them. I jut had them go through and replace the innards of the heads last winter. I had it all apart about 6000 miles ago for the freshened up heads and new rings. Pistons looked fine then. Only thing that happened since then was I had a cps shit the bed on me, so I rode home from work (about 50 miles) with the rear cylinder cutting out every once and while. I can't see that causing this much damage, especially since it ran perfect for 3000 more miles before just quitting while going down the interstate at 80...no funny sounds or anything...hell, I thought it was another electrical problem initially, til I checked it all and did a compression check. Any insight on this so I don't let it happen again? Its a 99 m2 with about 35k miles on it, by the way. | ||
| Ratbuell |
Speckles of metal tells me you have had massive detonation...timing issue? Fueling? For it to blow away that much piston you should have heard it long before it did all that damage...what exhaust do you run? It could have drowned it out... | ||
| Lakes |
RB has nailed it. i changed from Buell race ignition module to a Dyna adjustable that fits same place as stock, how much cranking pressure did you have? | ||
| Cupcake_mike |
Exhaust was loud but not that loud. The new cps was lined up exactly the same as the old plate and I checked timing, but maybe it slipped...sure would have thought I would feel it if it was that bad though? Oh well, I will take the opportunity to rid the bike of about 75% of its wiring harness and throw on a dyna s while its all apart this winter. | ||
| Gnutlethal |
Ouch, sorry. I feel your pain. Brings back so many memories... | ||
| Rick_a |
I did a Dyna S when a Crane Hi-4 single fire dropped a cylinder. The Dyna S has an advance curve that is both very fast and has a lot of total advance for a Buell, even with heavy springs. I lightened my weights considerably and limited their travel. It works, but it is definitely compromised compared to an electronic advance with a VOES for a street application. My bike requires race gas or octane booster to get the most from it (pulling cleanly past 6K is otherwise problematic). For track use it is fine. For street use be prepared for some hair pulling to tune it to a usable degree. | ||
| Lakes |
Rick a , must be a different model dyna gin to what i got, mine you can slow advance curve down a lot slower to the set advance curve the Buell lightning modem mine had. this one just bolts to frame ams as stock & it's electronic advance like stock no springs. last time i had that type advance was with an old Shovel head HD long time back. | ||
| Ratbuell |
Dyna makes a "nosecone" setup where the entire module lives inside the cam cover, where the factory timing plate is. No external "box". I ran one for years on my old Evo FLHP with a singlefire coil. | ||
| Rick_a |
The "S" is an electronically triggered mechanical advance unit. Any "tuning" is done with springs, weights, and pins. |
