ELKARACING_SHEE Posted August 15, 2010 Report Share Posted August 15, 2010 hey guys, i need to know what size of domes i need to put in my bike in order to run premium gas. Here is a list of mods i know that are done on the motor -JD racing ported motor (not a 4mil) -33mm pwk's with outerwear filters -billet intakes -Jd cool head. -maybe a timing plate that is what i can remember for now. My elevation is at 3500ft . If i can remember something else, then ill post up Quote Link to comment Share on other sites More sharing options...
TeamRealtreeHD Posted August 15, 2010 Report Share Posted August 15, 2010 20cc I thought this thing was a 4mil stroker? Quote Link to comment Share on other sites More sharing options...
madjimmax Posted August 15, 2010 Report Share Posted August 15, 2010 20cc I thought this thing was a 4mil stroker? So did he. Thats why you need to check shit out before buying it. But x2 on 20cc Quote Link to comment Share on other sites More sharing options...
TeamRealtreeHD Posted August 15, 2010 Report Share Posted August 15, 2010 Damn. That sucks. Was it atleast ripped down to see if it was ported? Heck, if he told you it was a 4mil and it wasn't, I betcha it might not even be ported either. Sorry to hear about that Quote Link to comment Share on other sites More sharing options...
06specialedition Posted August 15, 2010 Report Share Posted August 15, 2010 Damn. That sucks. Was it atleast ripped down to see if it was ported? Heck, if he told you it was a 4mil and it wasn't, I betcha it might not even be ported either. Sorry to hear about that Yeah thats no good Elka.... Glad to hear your keeping it though Quote Link to comment Share on other sites More sharing options...
TeamRealtreeHD Posted August 15, 2010 Report Share Posted August 15, 2010 What domes are in it now and what is the compression? Quote Link to comment Share on other sites More sharing options...
ELKARACING_SHEE Posted August 15, 2010 Author Report Share Posted August 15, 2010 What domes are in it now and what is the compression? the domes in it right now, i was told their 19cc domes, making it run on race fuel, which is very expensive here. The motor was build by JD, it even says JD on the cylinders, so its gotta be ported, cause its got tons more power over my blue one, but it doesnt matter, cause im putting a 421cub in it, when it blows up Quote Link to comment Share on other sites More sharing options...
hercalmighty Posted August 15, 2010 Report Share Posted August 15, 2010 Hey Elka, at your elevation you should be fime with 19cc domes. Just pop the head off and make sure they are 19cc. Quote Link to comment Share on other sites More sharing options...
EvilBanshee Posted August 15, 2010 Report Share Posted August 15, 2010 I say go with a 20cc as well. Quote Link to comment Share on other sites More sharing options...
ELKARACING_SHEE Posted August 15, 2010 Author Report Share Posted August 15, 2010 Hey Elka, at your elevation you should be fime with 19cc domes. Just pop the head off and make sure they are 19cc. every one is saying 20cc domes, except you, im confused Quote Link to comment Share on other sites More sharing options...
hercalmighty Posted August 15, 2010 Report Share Posted August 15, 2010 I don't know why everyone is saying 20cc domes. At higher elevations you can run smaller domes. I had no problem at all running 20cc domes on 93 octane and I live at sea level. I know a lot of guys who live at about 1500' run 19cc domes on premium. So at 3500' you should have no problem at all running 19cc domes on 92-93 octane Quote Link to comment Share on other sites More sharing options...
ELKARACING_SHEE Posted August 15, 2010 Author Report Share Posted August 15, 2010 I don't know why everyone is saying 20cc domes. At higher elevations you can run smaller domes. I had no problem at all running 20cc domes on 93 octane and I live at sea level. I know a lot of guys who live at about 1500' run 19cc domes on premium. So at 3500' you should have no problem at all running 19cc domes on 92-93 octane oh ok, well, i will give it a try, right now i have race gas in it, and its running a bit more rich then in Oregon, and the idle is a bit higher too. So you think, that i should be able to run premium gas in it, the way it sits right now with 19cc domes? Quote Link to comment Share on other sites More sharing options...
hercalmighty Posted August 15, 2010 Report Share Posted August 15, 2010 Do you have a compression tester? If so do a compression test. If not pop the head off real quick and check the dome size to make sure its a 19cc dome. If it is, yeah, throw some 93 in it and run it. Quote Link to comment Share on other sites More sharing options...
ELKARACING_SHEE Posted August 15, 2010 Author Report Share Posted August 15, 2010 Do you have a compression tester? If so do a compression test. If not pop the head off real quick and check the dome size to make sure its a 19cc dome. If it is, yeah, throw some 93 in it and run it. i dont have a compression tester, and i have no way to get one, except for buying one. Taking the head off, i can do that, but i cant put it back on, since i dont have a torque wrench either Quote Link to comment Share on other sites More sharing options...
AKheathen Posted August 16, 2010 Report Share Posted August 16, 2010 so, how did you verify it is stock stroke? if you have 19cc stroker domes. that will be really pushing pump limits at 3500' if it's sock stroke for sure, then 19's are fine, no problem. just sayin- assume makes an ASS of U and ME. and, remember, you will need at least 50/50 if you go below 1500-2k, depending on timing. definately check the jetting, though. after you make the switch to pump. generally, you would end up rich, but the fuel up there may make you on the lean side, since they run differnt s.g. pump at higher elevetions. Quote Link to comment Share on other sites More sharing options...
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