kawiking Posted October 7, 2007 Report Share Posted October 7, 2007 here's my problem.... i have a k&t head with a set of 18-17 domes. right now im running a shaved head(.030). after i had my cyln drag ported my compression was 140lbs on my new rebuild.this bikes pretty much just a drag race/play bike. my problem is , my bike started everytime on 1st kick... and runs good. im running a 22 inch 9 paddle tripple buff hauler. this bike comes out of the hole in second great abd pulls hard. ive heard so many people complain of dealing with o-rings. im running c-12 race gas 50/50 right now,if i go with the 18 domes i'll have to go 100% r-gas.. this bike runs great,should i go with the head and try and get more torque ?? i always hear 165lbs is great for compression , im at 140lbs. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted October 7, 2007 Report Share Posted October 7, 2007 ive had several drag motors and i run them about 165 to 170 pounds. any more than that and youll suffer on the top end. any less and youre gonna lose much needed bottom end to get off the line. i say switch to the cool head. gas isnt gonna fuck with the o rings. there are tons of people here with cool heads and no o ring issues. Quote Link to comment Share on other sites More sharing options...
brian Posted October 7, 2007 Report Share Posted October 7, 2007 Just to clear it up. Are you saying that it is hard starting now (since the drag port) ? I think that 18cc domes will boost your compression a bit higher than 165psi if your topend is pretty tight. You're right, you will have to run 100% c-12 instead of 50-50. IMO it is worth the performance gain to spend a few dollars more on fuel. Quote Link to comment Share on other sites More sharing options...
kawiking Posted October 7, 2007 Author Report Share Posted October 7, 2007 what im trying to say is , its runs damn good right now.... starts on first kick,holeshots in second gear and i dont mind race gas(i run it straight in my kawi). i guess im trying to say is ive heard so many people say they hate cool heads because of the o-rings. im just not sure i want ot mes with them,but.... i do want more compression.im at 140 now--- id like to be around 165 . but... not sure if i need it, you want more compression to pull hard out of the hole. well mine pulls great !! but you dont want to much or it would hurt u on top end ,right .... Quote Link to comment Share on other sites More sharing options...
sredish Posted October 7, 2007 Report Share Posted October 7, 2007 the people that hate the orings, hate them because they're inexperienced with installing them and the head. the orings are the ONLY way to do a 2 stroke head. the cool heads are awesome, last forever and you can dial in the compression you need. the orings are typically reusable but it's good to have several sets on hand if your going to be doing multiple changes. they are easy to install, never a problem, just watch how they go in. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted October 7, 2007 Report Share Posted October 7, 2007 I'd disagree with that...Scott. I've NEVER had good luck with my cool head, and I sold it. I run a stocker cut and Oringed on my cub. In fact, many of the guys I ride with do the same... I've tried everything under the sun to get it to seal right. Dry, grease, RTV...thread sealer, RTV on the studs....copper washers under the nuts, everything. And unless I didn't fire the motor, I used a new O Ring kit every time... I'm very interested in the one piece heads that only have removable domes. I've been told by several people around here they are nice!! 7 orings instead of the 17 or 18 in a normal cool head. Maybe it's just me.... Quote Link to comment Share on other sites More sharing options...
Coupelx Posted October 7, 2007 Report Share Posted October 7, 2007 I love orings. i reused the ones on my trinity head when i switch domes awhile back. they were a little stretched but with some petroleum jelly they stuck right on to the grooves with no problems. Quote Link to comment Share on other sites More sharing options...
Coupelx Posted October 7, 2007 Report Share Posted October 7, 2007 I'd disagree with that...Scott.I've NEVER had good luck with my cool head, and I sold it. I run a stocker cut and Oringed on my cub. In fact, many of the guys I ride with do the same... I've tried everything under the sun to get it to seal right. Dry, grease, RTV...thread sealer, RTV on the studs....copper washers under the nuts, everything. And unless I didn't fire the motor, I used a new O Ring kit every time... I'm very interested in the one piece heads that only have removable domes. I've been told by several people around here they are nice!! 7 orings instead of the 17 or 18 in a normal cool head. Maybe it's just me.... my trinity head has 7 is super easy to put on, and havent had any problems in the few times ive had it apart as far as compression or coolant leaks. 18 o rings would be a bitch to put in Quote Link to comment Share on other sites More sharing options...
dajogejr Posted October 7, 2007 Report Share Posted October 7, 2007 I think the Trinity head is similar to the Mod-Quad head. It's all one piece, and just the domes are removable, no? Quote Link to comment Share on other sites More sharing options...
Coupelx Posted October 8, 2007 Report Share Posted October 8, 2007 I think the Trinity head is similar to the Mod-Quad head.It's all one piece, and just the domes are removable, no? i have never seen a mod-quad head, so i cant confirm that but yes just the domes are removable. 2 orings on each dome (top and bottom) and 3 on the head itself. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted October 8, 2007 Report Share Posted October 8, 2007 Sumthin like this: http://modquad.com/store/detail.asp?PRODUCT_ID=ch-1 Quote Link to comment Share on other sites More sharing options...
burleybanshee Posted October 8, 2007 Report Share Posted October 8, 2007 I run a Noss head and have no problems with it. More of a pain to bolt on, but if you do it right you should have no problems. Not sure about the cool head. I have seen the one piece head, i like it as well, less o-rings, same enlarged area for more coolant. As to the race gas need. At 140 right now you could just run straight 93 octane and be just fine. The 160-165 range is where you need start getting into the 50-50 range, depending on your timing advance. I'm at 165 psi, no pinging on straight 91 octane, but i run 110/91 50/50 mix at 40-1 927 oil just for a piece of mind. Get above 175 now you are in the 100% race gas area depending on the motor. Do you have a good compression tester and holding throttle wide open when you are kicking it over & over & over??? Was the motor cold or hot? You are already running a shaved head and only have 140, more than likely do to the drag porting heights on the exhaust. I would say throw 19's in and see, should put you real close to the 165 mark. Quote Link to comment Share on other sites More sharing options...
kawiking Posted October 8, 2007 Author Report Share Posted October 8, 2007 im running 50/50 because i have my timing on 4 1/2..... think i may jump it to 5...... i was thinking of going 18 if i do... i bought a set of 17 but my buddies say i could try his 18's first. if anyone needs some 17's i go a set brand new..... my bikes like a freak of nature... bought for $500 in pieces... put the whole bike together, frame cracked missing half the bolt. rewelded the frame ,spray painted it... and so on. this bike is FAST.... and never breaks down. thats why im so back in forth on the cool head. i guess im just wanting somebody to say the o-ring arent really that bad and its really now problem.lol !! i kind of like the saying "if its not broken dont fix it ".... BUT.... i always am looking to go faster, and more torque is POWER !!! Quote Link to comment Share on other sites More sharing options...
kawiking Posted October 8, 2007 Author Report Share Posted October 8, 2007 is jetting a must when changing domes ? Quote Link to comment Share on other sites More sharing options...
XxMeltIcexX Posted October 8, 2007 Report Share Posted October 8, 2007 This has been coming up alot lately and it really makes me wonder how people are having problems with their o-ringed heads. I am running a nosshead, and I have never had any problems with getting a good seal. The only person I really have heard has the problem is big ol dajo. Maybe hes got a defect in the batch, maybe his cubs got a defect, or maybe it was user fault? (Just makes me think why hes having the only problem out of many) Everyone else always has good words to say about them. If i were in your shoes id go for it and put it on, whats it gonna hurt to try it out? Trinity heads are very nice, is your the stage V or IV? The V has always been my favorite, it has those extenders that go to the cylinder base, looks trick. Eric Quote Link to comment Share on other sites More sharing options...
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