Wow 4 HP to me is alot. Every ounce you can squeeze out of that heavy beast is always a plus. I didn't think it was that big of a jump. Maybe 13:5.1 would be a better choice. I will bug my friend for his compression tester and see where it's at.

 

hey entomber, before you crack back into the engine try a 42 rear sprocket there like 50 bucks you save a pound of weight , rotating mass at that , and if you go with the sprocket specialist it's another 4 ounces. dail in what you have first then jump up the piston if you feel the need. but again nitrous is a much bigger bang, $650, whats a piston 350- 400, i told you the sandbomber and i could go back and forth, but when i went to nitrous it wasn't even close, want to now what was the best part though, glenn was as happy as me to see a bomb go that fast. did you put that, stock air tube on the back of the carb? and have you checked you timing after you fired it up, guess it could be off one tooth if you didn't watch close it would be easy to check just pull the top. and i can't believe you don't feel the power difference, heck my stage two will pull the front tires up even with those crap kendas that came with it, get thatthing figured out, need to hear some good race victories[img]i/expressions/face-icon-small-smile.gif[/img]

 

Hey Entomber, I don't want to soundl like a D#$k here but you are never quite satisfied with your gains. You are correct on that Piston though. The cut in the head you are reffering to is that Gary has to cut some of the material out of the combustion chamber to make the piston work. But this is a good design kind of like a Hemi motor. The problem is is that Gary had to have some new pistons made up or at least he was supposed to. The ones like he had put in my bike were like 10:1 compression instead of 13:1 like he had stated. The reason being is that he ws trying to use a piston that would work with his stroker and stock stroke motors. The piston you have is probably the old style onelike we had. The compression height is .050 to low and .050 is a Lot!!!!!!!! So if you get the newer piston from him you will see the gains you are looking for. Also get the 48mm Lectron carb and maybe you finally experiance the same kind of power the Annhilater is feeeeeling!![img]i/expressions/face-icon-small-wink.gif[/img][img]i/expressions/face-icon-small-happy.gif[/img]

 

Hey Punisher,

No you don't sound like a D---, I think everyone's opinion is valid here. Some might consider me a complainer. Punisher you have confirmed what someone else told me. Since I'm not as motor savy I didn't want to open my mouth and sound like an idiot. I was told that that piston seems to be designed more so for a stroker crank. Personally I would love to drop a stroker crank in my motor, but I do not have the tools, nor a good local mechanic to do so.

I really want to get a new piston but the pricetag on a 13:5.1 is rather high. I'm never one to haggle pricing, but if I knew what I knew now I'd ask for a 11:5.1 compression and insist on something in that ball park. A new piston from Gary was quote nearly $400.00.

If ALL I had to ride was wide open dunes with drag racing abound I'd consider a 48 and a nitrous kit. Nitrous seems like a big hassle and I already witness a DS with it setup all wrong go out. Once that bottle runs out it's dead weight. I think I'd rather fork for a turbo setup, it's always there, the extra ponies. 48mm carb is just too big for most of the riding I do. I rarely see 5th gear and if I do I'm not in it for no more the 12-15 seconds.

I guess Majorecho put it realistic to me. Don't expect too much cause you'll be disappointed in the end. I guess I was expecting more. I've heard nothing but great things about the 720 kit and so far seems pretty reliable. I does pull hard within the midrange. Comparable to my friends Stage III. I have opened it up down the road and it seems like it got more meat midrange and up.

If I crack into the motor I'll do the valves while I'm at it. The turnaround time is 3 weeks plus shipping from TVI and riding season has started.

 

Well I don't know why Gary won't help you out on that piston? I guess if you could convince three other TVI 720 owners that there piston isn't the right one then you could get JE to make you up a batch of 4. Unfortunatley this is the only way they will sell you a piston, 4 at a time. But they only Charge you $150.00 a piston, which is your cost. Interesting huh? Well I wish you luck my brother, and I wish I had the money to open my own place and I would hook all of you up with the right Customer service and performance you are looking for and deserve![img]i/expressions/face-icon-small-smile.gif[/img]

 

you should have went and bought the HP research big bore i know its more but he has way better servis and you woulds felt more hp

 

slidesquad, he (Entomber) bought the TVI 720 before HP Research had their big bore cylinder released.

 

David,you got the piston you wanted to run pump gas!Your problem is you need to adjust your valves and tune your bike.SANDMAN runs the same piston with a racehead ,45 carb and RW StageIII is dead meat around him!!!! Has anyone run a Mr HP BIG BORE YET???

 

Boomer how did ya know my name?

Anywhow looks like I need the complete race head. I think I need the larger valves.


A little sidenote,

I'm not mentioning who has PMed me but I have had several PMs of other DSers on these forums reading my posts responding to me with the exact same feeling about thier TVI 720 kits. Again I'm not trying to slam his business and not become a complainer, but its a relief that I'm not the only one feeling this way.

 

Have you changed the needle for your lectron since the 720? If not you are not going to get that thing tuned right to save your life. I would talk to randle at richards recreation (MRHP) about a needle for your setup. They hooked me up and now with the correct set up and the new mods (11.5 piston, cams, head work, ported intake, Ct full pipe) I can really feel a difference. Also you NEED to run the snorkel tube. I ran the air box cut out with a KN filter and outer wear. It seems to run real well and the plug is about spot on with just a little tweek of the needle.