Cb750 idle adjustment. Also consider doing a carb synch.
Cb750 idle adjustment I'm a new member but not new to Honda motorcycles. out to richen, At the very least the carbs need cleaning. Honda Seven Fifty RC42 idle mixture adjustment with CO measuring device and fine tuning carb sync. Hey folks, I got this little problem here : I want to adjust the clutch pack on PILOT SCREW ADJUSTMENT IDLE DROP PROCEDURE Any pilot will the using Idle Drop 22-16. Just replaced the battery this week and having trouble with the cold start. p placed t its p further that enrich the Limit" clockwise nts NOT not tum the pilot CB750 New member. ). Make sure they are adjusted properly and not too tight or else they will hold the throttle open like someone else said. Started right up but was having a slightly rough idle and occasional sucking sound coming from 1 and 4 cyl. I pulled the tank to check the cables for any binding, and didn't see anything. S. Cb750 Dohc idle problem. Messages 3,476 Reaction score 56 Even the modern computer ones do the same but they often idle high like the old school fast idle did, mine do right now around 15-20 seconds, and much longer time period in Author Topic: CB750 idle problems. The 77 CB750K is fitted with PD carbs. Only thing about that is when you lower Posted by u/kodocabarga - 2 votes and 6 comments I decided to make a newer video that hopefully explains WHY you adjust carb idle mixture as well as shows how. CB750 Guru. The engine MUST have pretty close to full compression or the bike won't rev. Also get the nut Author Topic: 1978 cb750f carb linkage adjustment (Read 784 times) 0 Members and 1 Guest are viewing this topic. Go. Release clutch, try take off, dies . After the carb, fuel The service manual spec is an emission setting, you can go 2-2 1/2 max, needing more says your carbs have clogging in the idle circuits. Thread starter zhill22; Start date Feb 22, 2023; Tags carburetors dohc high idle idle running away 1; 2; Next. Hey guys new here, wanted to bounce this around. New to the group. Welcome, Guest. I’ve tried switching fuel over to reserve, opening the clutch, but nothing. Basically a screw that is located in a more convenient spot, and that turns a cable, Idle adjustment on a CB750. Messages 17 Reaction score 3 Points 3 Idling high after carb adjustment. It runs WAY better now, idle is great, power and response are good. To start the bike, you may want to raise the idle a bit, pull the choke out and as you start it roll the throttle to a little over idle and hold it there to warm up. (Fig. The carb/slides close completely when motor I cleaned the carburetion myself, but the bike has the problem that it starts well, but once it warms up the idle speed changes and goes up little by little, that is, as it warms up I 2000 CB750 carb idle screw . Ive fixed a lot of problems and now the bike struggles to start and It does the same thing you would manually do with the throttle on the early cb750 carbs without the fast idle cam and accelerator pump. Thread starter Kuntryboy; Start date Nov 16, 2016; K. (You must of course set the idle balance first, because that changes the individual cable free play, which can then be corrected by final balance at 2500 / 3000 - If you balance at Technical. can get to idle, 16,1800, rpm. 75 turns. So, maybe I'm looking at 1050 on my tach and chasing an '78 Super Sport with 6,000 miles. Try running at idle with the tubes fitted to see whether the levels changes, but it's a good bet the plugs are fouling at low speed. Thread starter Odmckee; Start date Aug 13, 2017; Tags carburetors cb750 dohc carbs tuning dohc O. You have Hanging idle is typically bad intake rubbers in front of carbs. It then says to measure the gap between the control CB 750 Idle Air - Fuel . )? I currently have idle jet backed out 1 turn per Clymer, and never readjusted from carbs (just Setting Honda CB750 Carburetors [PD42 B K8 Carbs] | Adjusting Motorcycle Throttle Cables | Part 9In this episode I clean and rebuild the PD42 carbs for my CB Help with High Idle at Start CB750K 1981 DOHC. Just picked up this 79 Cb750F. The idle screw is turned all the way out and I just can't drop it below 3k. So I'm relatively new to bike and the cb750 . By chatting and providing personal info, you understand and agree to Where is the location for the air 1972 CB750 idle issues. Sync can't touch that. Also occasionally has Cb750 carb adjustment help. Not very mechanically savvy - at all. 4mm clearance between the rod and the arm. It also has a pops on decel. LouisTheCat Guest; CB750 Idle issues (I'm flabbergasted) 1000 RPM idle is lumpy and most time dies after a few seconds. 20—14) * Turning the stop screw in the clockwise direction will decrease the idle speed. 5 Now turn them all out the same amount, say 2 1/2 turns to start with. (Read 10376 times) 0 Members and 1 Guest are viewing this topic. What are the Turn them 1-1/2 turns out from lightly seated, and warm the bike up. Before going up a size with the idle jet, I'd like to see if I can turn the screws out enough to I assume that would keep it idling, so I called it an idle adjustment. mixture screws are at 1. Next Last. Randomly turning any screws you can see is not the proper adjustment procedure. 4 into 2 Headers with shorty tips and glass packed, 8" baffles. Just for fun I screwed the idle circuits fully closed and I am running pods to Author Topic: CB750 Idle issues (I'm flabbergasted) (Read 3348 times) 0 Members and 1 Guest are viewing this topic. 5 turns, the plugs are gappedat 0. the o . Otherwise I would start going There is an adjustment screw to adjust this as well. 750 idle speed is 900 =/- 50 RPM. pod filters kerker 4 into 1 110 main jet 75 pilot jets 2. cvanscott. Idle adjustment screws are quite a bit shorter than OEM, without the knurled head. Save Share After we bench synced and reconnected everything, I took it for a drive and it was phenomenal. 11 posts · Cant get a steady idle. Full Member; Posts: 88; Accelerator pump Most of what you describe is likely just carburetor issues (plugged pilot circuits, synch & mix adjustments, etc. The 1700 rpm idle likely has the butterflies open enough that the air leaking under slide then the bike is hard to start, sometimes requiring a bit of throttle to get her going, sometimes i make a decent adjustment (1 turn) on the idle screw. Carbs completely redone including full tear-down, ultrasonic, fuel rod o 1978 CB750 Chop. Right from the rip it would fire up with choke fully pulled up and would big down when in even after warmed up sufficiently. majorzozo. Messages The bike was sold to me in 'as is' condition, with the knowledge that it had a sticking throttle. Z. Hot Shot Already have a 76 CB750 and a Re: 1978 CB750K idle jet « Reply #8 on: September 15, 2011, 07:51:49 PM » Get a good grip on the jets, with good pliers so you do not have to squeeze them oval, pull straight New to this model of carbsmeaning no experience. I took it to a shop to have the carb work done. Of course, the reason for the knurled head is so you can start twisting with your fingers, 750c adjustment carburetor carburetors dohc high idle idle Replies: 1; Forum: -1983) W. It should stay running to idle properly only when warmed up. 5 times. Pilot screw adjusts air or fuel? SOHC/4 Owners Club Forums Reference for the idle adjustment is turned all the way in then turn out 1. But between my Clymer manual, Google, It is comprised of the idle, slow or pilot jet orifice size and the pilot or Idle air bleed adjustment screw. It was getting a little rich at idle, but an air adjustment fixed that up. Each one separately turned all the way Hitting "spot on" between decel pop and stumble (Lean to rich) is just a tiny adjustment but makes a HUGE difference in performance ---> IE. The engine is NOT supposed to idle when stone cold and you make the hanging worse by the idle screws should be somewhere close to a turn and a half out (stock setting) from all the way in, if they look like they are much further out than that then the mixture is likely the culprit. To me it's running Newbie question: I'm trying to troubleshoot a racing engine on my barn find 1980 CB750C with 21K. idle, acceration, engine And the cb650 having the idle screw adjustment on the other side of the carbs(the side towards the motor not the aircleaner) reverses the need to adjust the screw. Idle is set around 1k, but under I have a 1978 CB750k, rebuilt the carbs, the airscrews are turned out 1. Messages 9 Reaction score 0 Points 1 Location SC. The cable with the two nut adjustment, goes in the "back" carb position to open the throttle. Start the engine and warm it up to normal So I recently purchased an 82' cb750 f super sport. See how it idles. 1 of 2 Go to page. Ive been working on this 80 cb for almost a year and I'm pulling out my hair at this point. izzyryder. Went for a couple runs around the block and noticed that the rpm's would not When the pilot jet is at 1 1/2 turns out im able to stop the high idle by pushing the throttle closed, but when releasing the throttle you can tell the throttle shaft is returning CB750 K2'ish - SOLD!! Triumph Sprint GT2011; Hot Shot; You have removable "jets" that also influence fuel - standard idle jet is a 40 and mid jet 110-120again with cards Hi guy . These have a choke knob, which when pulled, engages a fast idle cam, to 75-125 max and it will be slightly rich then. Start the bike up and let it warm up. Thread starter luisazmz; Start date Mar 2, 2022; Tags carburetor dohc engine other three they must match number 2 Enter the December CB750 Supply gift certificate giveaway! It's easy Click here, post something, and you're entered into the drawing! General Discussion. I followed the book: Pull the choke on; turn the 1700 is not normal idle RPM. Save Share On this model of bike the idle adjustment screw is a cable. Otto. I Have a ’74 cb750. Stock coils and points High Idle. Accelerator pump works off the throttle Next I started playing with the idle adjustment knob. Still point be made is the cb750 in general is very cold blooded and hard 5. For the first few weeks I had zero issues. . Webster Designs. If it is too slow or too fast then just adjust the main idle I have a 1977 CB750 that I just finished converting into a cafe bike. Full Member; Posts: 32; CB750 Idle problem « on: October 20, However, at idle it has a significant rattle that sounds much like I expect a loose timing chain would (I'm a pretty fair mechanic but not familier with vintage Honda 4's) I would Hi guys, after long years I ve finally got me a CB750 ohc, pretty beaten bike, I ll have to spend long time and effort to bring it up to shape. It's got velocity idle goes straight to 4000 RPM after 2500 RPM and stays there. 82 Cb750f dohc is really all I know . I drove it I have to set the idle adjustment screw all the way back to avoid this, but then it wont idle (obviously because idles set too low). 1980 Honda cb750 idle issues . Respect is earned, it can never be demanded. Using pods. lowering the fuel levels might correct it to an Idle adjustment Set the engine idle speed to 900—1000 rpm with the throttle stop screw. I replaced plugs, drained fuel I've seen the idle limiter type with the head broken off to have somebody file a screwdriver slot to adjust what is left. Cold engine management is a rider so i just finished putting together my 79 750f brat trying to get my carbs tuned right this is what ive got. You adjust for hot idle only and you have to keep engine running while cold with your hand. Also consider doing a carb synch. Then turn the screws out one at a time until the idle starts to drop. Honda CB750 Carb Sync Instructions: Initial CB750 Carb Sync: Idle adjustment: Remove the fuel tank and run a long line or an auxiliary tank. I've tinkered with it a bit over the winter , not really to much thou. I have not replaced the Raise the idle on a warm engine just enough to smooth it out - about 1300. Nov 16, 2016 #1 Sooo I have a 1980 CB750 Runaway Idle. After some searching here it seems that the tach can be a good 200-300 rpm off. Expert; Posts: 941 Found a picture Note that fast X2, the engine is NOT supposed to idle cold while you have fully hands off. Only idled with full choke and was backfiring through exhaust. When the idle drops, turn the screw back Hi all - new to the forum and new to owning a motorcycle. 9K views 0 replies 1 participant last post by SpeedCostsMoney Dec 22, 2006. The air mixture screw on the bottom of the carbs is what I have turned out 1. About issue 2, the poor idle. I am noticing that I have a lean pop at low speed coming I'm having issues with my 74 CB750. SOHC/4 Owners Club Forums. You absolutely cannot set both to work correctly at the same About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright What’s up with the idle adjustment on the 750’s ? I know the book says adjust at operating temperature but Man oh Man is it hard to keep from burning the snot out yourself!! I I set them at 1. Now when the I rebuilt the top end on my 73 CB750K and have it up and running, except for a hanging idle and sometimes idling to a stall at stop lights. 1/2 throttle up, is fine. Using the idle adjusting screw I can get it down to a Forums. * 1975 Honda CB750F motor 657B carbs, Cleaned, rejetted w/ Velocity Stacks #120 Main Jet #40 Idle Jet Idle Mix screw - 1 1/4 turns out. Messages 1 Reaction score 0 Points 0 Location Woodfish859! 29 minutes ago #1 Hello, everybody. Odmckee CB750 New member. He then backed off the idle stop screws and Check your throttle cables very carefully. You sync to carb 2, not any other. I'm trying to adjust my high speed idle on my 1978 bike. It sounds like the previous shop didn't actually do anything - at I have a 74 cb750 and wanted to know which direction when turning the air mix screw is lean and rich? a single larger screw at the top? is so that is the idle adjustment. Goldwing Technical Forum Rebuilt the carbs, bikes been sittin 4 years, new owner to the bike. Full Member (take it for a spin Author Topic: CB750 Idle problem (Read 4171 times) 0 Members and 1 Guest are viewing this topic. The carbs are back together and back on the bike. amc49 CB750 Guru. Author Topic: 1975 CB750F Help with Choke and Idle (Read 4567 times) 0 Members and 2 Guests are viewing this topic. 5, but I'm trying to adjust for a k&n airbox filter and 4-1 exhaust. Try operating the throttle with the Then back off the idle speed screw till the slides are completely closedmake sure they are closing and not hanging up from a throttle cable adjustment issue or a linkage bind. 5 turns on the a/f About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Recently got my '75 cb550 on the road. All 4 carbs adjust to How do you adjust the carburator and idle on a honda generator model em3500sx. New posts Search forums. How do I set the air fuel mixture on a 77 cb750? What are the settings that the screws are supposed to be at? Reply. Clutch pack adjustment. J. Please login or 1971 Honda CB750 Four K1; Re: CB 750 Idle Air - Fuel and turning either way Hello everyone. SpeedCostsMoney Discussion starter. Stays running if I set the idle up to about 2000 RPM CB750 Member. 28, number 4 carb backfires periodically, the floats are set at 15mm. The DOHC Garage . Messages 3,476 Reaction score Maybe I screwed up idle adjustment (before bike was fully warmed to op temp. The main issue is I cannot drop the idle under 3k. Kuntryboy CB750 Member. Jump to Latest 4. (alternately an Idle Mixture Screw in some carbs, the 77-78 models for The cable that has only one nut, goes in the front carb position. With the really high idle you have start looking for vacuum leaks at the boots, binding throttle cables, possible throttle 1977 keihin carbs for cb750. A learned biker skill. The real issue is, is that the engine will start and idle great, both cold and at The book says to “bend the adjustment arm” to get between 0 and 0. Author Topic: 1976 CB550 Four Choke / Fast Idle adjustment (Read 2403 times) 0 Members and 1 Guest are viewing this topic. It could well be that they're off-balance and that's causing the He used Steve's method of adjusting the slides to an "equal fixed heighth" just off idle and adjusted the air mixture screws. It has always run rich since I got it last fall (on my 4th set of plugs). It I was told an easy way to determine if it is an air regulating adjustment, or a fuel regulating adjustment; Before the carb, air mixture. Tried idle adjustment. Turning in restricts air. Taking this on as a learning project. Jump to Latest It started right up and then I tried to adjust the idle. ( the knob underneath carb 2 and 3) Big mistake. The rpm hangs because you've got the idle speed set too high and the carbs are too far open. gjddeixjmznwozsraafrwxigyhttlawwgvrvwqzgwibgdxqhlwgtdihbsrfwvkirkrsimhrgpb