Dmac68 Posted March 2, 2020 Report Share Posted March 2, 2020 Hey guys I have a 1996 banshee. According to the info I provided on here it was a 421 trinity . I pulled and had to have the cylinders done. It now is bored to 70mm and has 17cc domes that we’re originally in it . What type of fuel should I run with this setup and can I order it online some place ? Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted March 2, 2020 Report Share Posted March 2, 2020 Post some pics. Some of what you say doesn’t add up. With 17cc domes you are looking at GOOD fuel! I’d check squish before doing much as well. Quote Link to comment Share on other sites More sharing options...
Dmac68 Posted March 2, 2020 Author Report Share Posted March 2, 2020 Post some pics. Some of what you say doesn’t add up. With 17cc domes you are looking at GOOD fuel! I’d check squish before doing much as well. Squish ? Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Dmac68 Posted March 2, 2020 Author Report Share Posted March 2, 2020 It has a trinity IV head on it (17 mm domes ). It was bored to 69.45 when I took it apart and is now at 70mm. The porting was like this when I got it and has hot rods (CKJ158). I am not sure if it’s a stock crank or not. All I did was a top end and put it back together so any help/suggestions on what I have or if I need to change something or run a race fuel would be greatly appreciated . Attached a few photos of the parts /porting Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted March 2, 2020 Report Share Posted March 2, 2020 What stroke is crank? There’s a lot of questions here. That’s a pretty exotic setup if it’s what you say it is. Have you ever checked compression? Quote Link to comment Share on other sites More sharing options...
ClaudeMachining Posted March 2, 2020 Report Share Posted March 2, 2020 Check compression and report back.Envoyé de mon SM-G965W en utilisant Tapatalk Quote Link to comment Share on other sites More sharing options...
Dmac68 Posted March 2, 2020 Author Report Share Posted March 2, 2020 Guys I have not checked compression. What is the best way to get an accurate reading ? Use a gauge and just kick it over ? Also is there a good way to find out what stroke the crank is without pulling it apart ? I never had the bottom end apart . Thanks for all the support! Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
SKEETER Posted March 2, 2020 Report Share Posted March 2, 2020 Start, warm up. Pull plugs. Use correct tester, kick as fast as u can for 6-7 kicks or till needle stops moving. Check twice each side. Remove tank Get micrometer Find tdc or bdc. Turn over till full stroke is achieved. (Plugs out will make easier) Stock stroke is 54mm. Anything above that will tell you what + stroke it is. Quote Link to comment Share on other sites More sharing options...
SKEETER Posted March 2, 2020 Report Share Posted March 2, 2020 Harbor freight has micrometers for cheap, that work just fine. Quote Link to comment Share on other sites More sharing options...
Dmac68 Posted March 2, 2020 Author Report Share Posted March 2, 2020 What spark plug tester would you guys recommend ? Also how do I take the measurement ? Do I stick something down the hole and measure top dead center and at bottom ?Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
SKEETER Posted March 2, 2020 Report Share Posted March 2, 2020 A micrometer with extendable measuring probe , find tdc, zero it out, go to bdc, and measure. The cheap compression testers can read false. Buy the best you can afford. Orileys has 1 for 46$ I've tested with same results as a snap on. Quote Link to comment Share on other sites More sharing options...
SKEETER Posted March 2, 2020 Report Share Posted March 2, 2020 Pittsburgh tools makes a micrometer that works for your need, for around 10-15 bucks Quote Link to comment Share on other sites More sharing options...
Dmac68 Posted March 3, 2020 Author Report Share Posted March 3, 2020 Okay I took measurements and compression. I believe it is stock stroke. I measured a few times and all measurements were not exact but close to 54.00 mm . The compression photos are attached. I know this is low but what could be the issue? The bike has maybe 2 hours of run time on the fresh cylinders/pistons/rings. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
SKEETER Posted March 3, 2020 Report Share Posted March 3, 2020 Wouldnt trust that gauge for starters. You got an orileys auto parts store nearby? Theyll loan you a tester for free. I've had that same gauge read +/- 50psi off . Or find someone local with a good gauge to borrow. Try starting it to make sure the rings are oiled? Then pull plugs, kick like hell. If your losing psi after kicking, you're leaking somewhere, and will not read accurately. Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted March 3, 2020 Report Share Posted March 3, 2020 They’re consistent, which is good! That said, I’m not sure it would even start with compression that low! Quote Link to comment Share on other sites More sharing options...
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