Christoph

I’ll, so I have finally figured out my bike. Well sort of. When I put the stock air box back on my bike it dies right out after half throttle. But when I take the cover off it revs out normal. I am thinking it has correctors in it. Someone, anyone able to dig up some pics of them or explain where they go so I can take them out. In certain they must be in there but don’t want to run with open cone filters. Don’t trust them in the rain.

Hey all, I have been battling with this bike for a period of time now. First the carbs were dirty-cleaned jetted and reninstalled. Then had to locate a stock air box since the owner had changed out the stock one for 4 cone filter- found and changed. Now bike is running great for fire up, idle and through half throttle area maybe a little more. Then it’s like it is hitting a rev limiter. I put a timing light on it and zip ties it to my handle bars and went for a ride through town at night. Switch along all my coil wires. Found that when it starts doing it, looks like I’m losing spark on front 2 cylinders. Almost looks worse on front left cylinder. Say in the manual it says if the speed sensor fails that it will drop the rev limiter down. My speedo is working and seems to be reading correct. I haven’t put a tach on it yet but it does it at about 50km in first gear and about 70km in second gear give it take a few km. Anyone experienced this before or thoughts on cause or where to look. The bike is new to me and am starting to pull my hair out. I really just want to ride and been screwing with it for he past month. Thanks in advance.

all of this was done. Except I don’t know if there are any restrictors in it as I don’t know what they look like. They cards were way out once I put them all back on but got them to sync perfectly after about half hour of playing around. i have the air screws at 3 turns out as the Batons card kit said to start with that. The carbs were completely cleaned complete Barons carb kit installed that gave the new needles set on 3rd clip from top, new pilot jets and mains. Replaced fuel filter, got the stock air box on with new air filter and new spark plugs. Checked the setting of the TPS and was right where it was supposed to be. Now it idles and starts awesome. Great power to about half throttle. When I let off it comes back now smooth with no backfiring. But once you get above half throttle it is almost like you hit a rev limiter. Pip pops pip pops. Can’t get nothing. Let of and smooth as silk. Come right down to near idle then hammer on it, revs hard and then pip poppedy pip. I just don’t get it. I’m completely boggled. Also I did notice when I plugged the TPS back in it and did a test between the blue and yellow and slowly twisted the throttle while the plug was plugged in, it smoothly climbed up to 1.6ohms and then changed directions and went back down. Also on last test drive I tried unplugging the TPS and did same test but acted exactly the same just with the check engine light on. Anyone able to help or thoughts please do because I’m completely at a loss. Just plan old dead spot at 1/2 throttle up.

No all closed up. I just found out the guy before stretched out the vacuum slide springs a bit.

Hello, just removed the 4 cones air filters off my 1996 royal star deluxe to replace with the stock air box. After complete carb clean, rejet with barrons kit and barb sync. Bike starts and idles perfect and runs great up till half throttle but anything over that there is nothing. Wondering if maybe the previous owner had air corrector jets in it. Does anyone have a picture of the intakes of their carbs with or with out the air corrector jets in? Can’t find a picture anywhere. Thanks.

Update: Tore carbs all down and cleaned. A lot of crap in the air bypass valves. Re assembled with Barron jet kit for stock air box with aftermarket exhaust. Took all the cone filters off and found a stock air box to replace. Replaced fuel filter. Did carb sync and running great at idle and up to about half throttle. After that it is dead. Backfires a bit then nothing at all. This thing has be boggles right now. Anyone have thoughts now? Also wondering if maybe there is air corrector jets installed? I don’t know what they look like or where they go.

I haven’t had a chance to do much work on the bike yet but I do have a stock air box coming on Tuesday for it. I need to know what the air correction jets look like to make sure I don’t have them in my carbs when I put back together. I can’t attach pictures yet since I have not posted enough on here. Does anyone have a picture they can post or a way I can talk to someone that knows if my carbs have them or not? I can email or text someone if they will know. Also from my research I have been doing, looks like the air cut off valves can also cause my backfiring on deceleration. Anyone had issues with these in the past?

Thanks. 1 there is about 45 min from that has 87

Hmmmm, interesting. That’s a good thought.

The problem in Canada is we have ethanol in our regular and it’s not good on our engines. It’s extremely hard to find regular without ethanol in it. I should try and find some and see if it makes a difference.

I only run premium in everything. I have given it s hard 300 km run fine the highway already and I would never date put sea foam in anything I own. If it’s dirty or a problem, it’s cones apart and gets cleaned.

ye is do want to eventually find the air box and go back to it. Never have liked or trusted these type of filters. I do want to keep the aftermarket exhaust as I do like to hear my bikes. So going to have to figure that out if I can. Yes totally true. I am working on getting my carbs off to do a full cleaning and while doing that I am going to check the tightness of all pipes. They show no signs of leaking but I guess you never know.

I have just purchased a 1996 Royal Star with 20k km and this is my first V-4. The bike has every bolt in Chrome accessory and very clean. Now it has only had 70km put on it in the last 2 years. I have changed the fur out in it and have put 300km on it so far. Bike fires up and seemed to run very well at all. But if I bring tpm’s up while in neutral, it will start to back fire out the exhaust. When throttling up while riding it revs out pretty good. But when decelerating, it backfires out every exhaust it sounds like all the way down to slow rpm. Now for the bike from what I can see. It has aftermarket pipes on it so every cylinder has its own exhaust pipe, air box was removed and 4 K&N cone style filters fitted into all carbs and have checked the air/fuel mixture screw setting and is set at 4 turns out. I have not yet removed the carbs to clean and see the jets in the carbs etc. Wondering if anyone would like to give me some thoughts on this bike. I know my way around a tool box and bike but as I stated, new to the V-4 world. I am not a big fan of the air box being gone and do want to find one to get a box back on. Yamaha has dis-continued them and can’t buy new so may take a bit to find one. Thanks for everyone’s time and look forward to hearing feedback and thoughts on my bike. Love to get some fall km’s on before the snow sets in.