Ive pondered the third mount thing several times myself Dave, no way I know to make something even remotely universal but I've thought about making one for one of the frames I have thats hard to fit a chine girl into.
you sure you dont mean vibrating hard enough at 46mph to break the rear stud...lol!!A third mount to the top tube rolled around in my head also but I haven't really looked at it close. If the double block on the rear does not work I will probably weld sections of plate onto the frame and bolt it directly to those. I want to be able to pull the motor in and out quickly if necessary so whatever the final design I go with has to keep that in mind. I was hoping to move onto making big power with the next amount of time I have but getting that power to the wheel without breaking the mounts or worse has to come first. I am anxious to get the power I need for Bonneville at least in the test stages but I can't complain, this bike has developed pretty quickly. It was accelerating hard enough at 46 to break the motor mount so I am probably in the right track.
Ill tell ya Dave, Im so impressed with the balance of this old used GT5 lower I bought from YesImLDS, what has me scratching my head a little is the fact that befors I went together with it I could actually see a tad bit of wobble in the crank counterweights but I decided to just stick a jug on it and see what it would do.Yup.. the better balanced they are the higher they can rev not to mention the more comfortable the ride will be with no vibes at the seat or bars.
Not all Dax bottom ends are PK80 style. I ordered a dax bottom end and received a GT5 bottom end. Really threw me off, but I like the gt5 bottom ends so I am building that one and should be a nice ride. I didn't know he made gt5 bottom ends. Kind of makes me wonder...My engine is the GT5 style. I don't really have an explanation as to why the vibration has gotten so much better other than what i mentioned earlier. I really need to order a tach before putting it all back together this time. I think i am on the right road for my goals with it. I was afraid the 36 tooth rear would make it struggle off the line but what is probably a combination of the new rings seating in and getting the jetting right on the new carb, it pulled harder than it ever had with the 44 on my last ride right before it broke the rear mount. I didn't realize the DAX bottom end was a different stroke so I may keep with the GT5 because that is what i am learning and have a growing pile of parts for. I was going to try the same and add another base gasket, make a super thin head gasket and shave a touch off the jug also. Let us know how it reacts to that if you do it before i get too. Well it's my day off so i am out to remove my motor again so i can fix the broken mount and change out the bearings and all the other stuff i need to do for the next stage in setting up this bike.
Dax an still get the 40mm stroke engines, he decided recently to go with a GT5 38mm stroke platform because he said some of his customers like them, but he said he may go back to selling the original GenIV PK80 engines if it turns out that more people prefer them over the GT5 type.Not all Dax bottom ends are PK80 style. I ordered a dax bottom end and received a GT5 bottom end. Really threw me off, but I like the gt5 bottom ends so I am building that one and should be a nice ride. I didn't know he made gt5 bottom ends. Kind of makes me wonder...
Huh no kidding. Well I guess my order wasn't an odd order then!Dax an still get the 40mm stroke engines, he decided recently to go with a GT5 38mm stroke platform because he said some of his customers like them, but he said he may go back to selling the original GenIV PK80 engines if it turns out that more people prefer them over the GT5 type.
This is what Duane told me when I called him and talked to him about why he had quit selling the 40mm stroke engines.
No it wasnt odd at all, he has switched engine geometries, he built one up for himself he said right off to see how it would perform, he said all he did to his was clean up the casting slag from the ports, put one of the RT carbs on it along with one of those small banana pipe expansion chambers and one of the Puch heads he sells now bolted straight to the jug with no head gasket.Huh no kidding. Well I guess my order wasn't an odd order then!
Great that it's working for you! I am glad you got that piece out and it's a dang good thing I really mentioned that is what happened! I wouldn't want some mad at me for such a thing! I just need to get another GT5 piston and jug and I should be good to go on this dax bottom end, but the PK80 runs really well right now so I can't really complain. Sounds like you got a good running motor for ya! Hopefully it gets you far! If Dax showed increase in performance with the GT5 I'll trust that and I might just build another bike for this motor somewhere down the line and just have a couple bikes in my stable!No it wasnt odd at all, he has switched engine geometries, he built one up for himself he said right off to see how it would perform, he said all he did to his was clean up the casting slag from the ports, put one of the RT carbs on it along with one of those small banana pipe expansion chambers and one of the Puch heads he sells now bolted straight to the jug with no head gasket.
He told me he has been impressed with the performance of his, he said it has good power and is pushing his bike 40+mph comfortably with a 36T on the rear.
He told me that the balance of these newer engines is just as good as the 40mm stroke engines he was selling before, that was my main concern since the other dax engines I have are the best balanced engines I had run.
I can say that the GT5 lower I got from you has a good balance also, I was a bit concerned of how it would be when I noticed a slight amount of wobble in the crank counterweights when I spun the engine but to my pleasant surprise its a really smooth running engine, I still have some things to experiment on with it but its doing just over 40mph on the bike with a 41T sprocket, NT carb, kit exhaust slightly modified and one of the pedal chopper type heads, so I cant complain.
Im glad I flushed it out good though, I flushed out a good size piece of that wrist pin retainer clip that was still in it, it was at least a 1/4" long and would have spelled disaster if I hadn't got it out.
Yeah its easy to need a stable...lol!Great that it's working for you! I am glad you got that piece out and it's a dang good thing I really mentioned that is what happened! I wouldn't want some mad at me for such a thing! I just need to get another GT5 piston and jug and I should be good to go on this dax bottom end, but the PK80 runs really well right now so I can't really complain. Sounds like you got a good running motor for ya! Hopefully it gets you far! If Dax showed increase in performance with the GT5 I'll trust that and I might just build another bike for this motor somewhere down the line and just have a couple bikes in my stable!