Swayracing Posted April 2, 2021 Report Share Posted April 2, 2021 Hey can anybody tell me what would make my domes burn like this 😩😩 back story: fresh build everything went perfectly I feel as I went through assembly. Finally felt good enough for a ride according to break in...first ride went well! Got back plugs where loose 😒 I’m not an expert but I know that’s not what supposed to happen. Came here and did a lot of reading 🤓🤓so I ordered pilot jets it said it was 30s but idk if I was tripping but they look the same size by eye but I put them in anyway tested water starting blowing out my radiator 🤬 took it apart and Walla o rings on the domes are burnt and as u can see the damage to the Dome . What should I do?? 4mill,t5’s,tores delete ,air pods,1000 ft asl Quote Link to comment Share on other sites More sharing options...
Swayracing Posted April 2, 2021 Author Report Share Posted April 2, 2021 51 minutes ago, Swayracing said: Hey can anybody tell me what would make my domes burn like this 😩😩 back story: fresh build everything went perfectly I feel as I went through assembly. Finally felt good enough for a ride according to break in...first ride went well! Got back plugs where loose 😒 I’m not an expert but I know that’s not what supposed to happen. Came here and did a lot of reading 🤓🤓so I ordered pilot jets it said it was 30s but idk if I was tripping but they look the same size by eye but I put them in anyway tested water starting blowing out my radiator 🤬 took it apart and Walla o rings on the domes are burnt and as u can see the damage to the Dome . What should I do?? 4mill,t5’s,tores delete ,air pods,1000 ft asl could not figure out how to load pics for a min lol Quote Link to comment Share on other sites More sharing options...
375hp banshees Posted April 2, 2021 Report Share Posted April 2, 2021 Did you do a leakdown Beforeafternow?Where did you read if plugs back out change pilots.Did it blow oring/ start blowing our radiator, as soon as you fired it up w/ dif. pilots, or after you rode it a while with dif. Jets?What size domes& main jets, timing?Sent from my SM-A505U using Tapatalk Quote Link to comment Share on other sites More sharing options...
Swayracing Posted April 2, 2021 Author Report Share Posted April 2, 2021 1 hour ago, 375hp banshees said: Did you do a leakdown Before after now? Where did you read if plugs back out change pilots. Did it blow oring/ start blowing our radiator, as soon as you fired it up w/ dif. pilots, or after you rode it a while with dif. Jets? What size domes& main jets, timing? Sent from my SM-A505U using Tapatalk leakdown the first time yes the second time no i was reading one post on here i guy was warning about running the use of trinity plug locks and was pretty adamant about the pilots being lean why i tried changing mine i ordered some off ebay they said where 30s i know for a fact i had 25s in the carbs to begin with yes it blew o ring and broke a part of the dome off 21cc had a 330 in it went to a 340 stock timing plate just got an adjustable one have not put it on yet Quote Link to comment Share on other sites More sharing options...
gusto Posted April 2, 2021 Report Share Posted April 2, 2021 Obviously the problem is your blown o ring. Order another set, use Vaseline to hold in place while you clamp down and do a leak down test. as for jetting, what pipes and mods? Quote Link to comment Share on other sites More sharing options...
Swayracing Posted April 2, 2021 Author Report Share Posted April 2, 2021 2 minutes ago, gusto said: Obviously the problem is your blown o ring. Order another set, use Vaseline to hold in place while you clamp down and do a leak down test. as for jetting, what pipes and mods? T5s Quote Link to comment Share on other sites More sharing options...
375hp banshees Posted April 2, 2021 Report Share Posted April 2, 2021 Fuel & compression? What do the pistons look like?Sent from my SM-A505U using Tapatalk Quote Link to comment Share on other sites More sharing options...
375hp banshees Posted April 2, 2021 Report Share Posted April 2, 2021 @gusto it also broke head?& plugs backed out... then later the head busted, blowing o- ring out?Sent from my SM-A505U using Tapatalk Quote Link to comment Share on other sites More sharing options...
gusto Posted April 2, 2021 Report Share Posted April 2, 2021 Any porting? Stock carbs? Air box or pods? Aftermarket reeds? Youll need a 27.5 pilot with those pipes and you shouldnt be over 300 on the main i would think. Unless you're ported possibly. Quote Link to comment Share on other sites More sharing options...
375hp banshees Posted April 2, 2021 Report Share Posted April 2, 2021 @Sway what do you mean tested the water...test rode or literally ?Sent from my SM-A505U using Tapatalk Quote Link to comment Share on other sites More sharing options...
gusto Posted April 2, 2021 Report Share Posted April 2, 2021 (edited) Missed the broke head part sorry. That changes everything. Its not a stroker crank or ordered stroker domes? 21cc shouldnt be too high of compression to do that i would think? Edited April 2, 2021 by gusto Quote Link to comment Share on other sites More sharing options...
Swayracing Posted April 2, 2021 Author Report Share Posted April 2, 2021 17 minutes ago, gusto said: Any porting? Stock carbs? Air box or pods? Aftermarket reeds? Youll need a 27.5 pilot with those pipes and you shouldnt be over 300 on the main i would think. Unless you're ported possibly. athena topend no porting done by me Quote Link to comment Share on other sites More sharing options...
Swayracing Posted April 2, 2021 Author Report Share Posted April 2, 2021 15 minutes ago, gusto said: Missed the broke head part sorry. That changes everything. Its not a stroker crank or ordered stroker domes? 21cc shouldnt be too high of compression to do that i would think? it is a 4mill long rod Quote Link to comment Share on other sites More sharing options...
Swayracing Posted April 2, 2021 Author Report Share Posted April 2, 2021 19 minutes ago, gusto said: Any porting? Stock carbs? Air box or pods? Aftermarket reeds? Youll need a 27.5 pilot with those pipes and you shouldnt be over 300 on the main i would think. Unless you're ported possibly. pods stck carbs tores delete Quote Link to comment Share on other sites More sharing options...
Swayracing Posted April 2, 2021 Author Report Share Posted April 2, 2021 19 minutes ago, 375hp banshees said: @Sway what do you mean tested the water...test rode or literally ? Sent from my SM-A505U using Tapatalk its a fresh build so i was just riding in my yard and a few houses up the street so not really hard riding an it got hot fast seems like if i went around the block witch is less than a half of mile by the time i get back the plugs were working there way out! Quote Link to comment Share on other sites More sharing options...
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