davmo 10 Replies. As the chain wears, it deforms the chainwheel teeth to match the increased pitch of the worn chain. There's no inventory to take on, nothing to ship and no customer service to deal with. '01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, K&N. It may be quite tight when the cranks are in one position, and rather droopy after the cranks have rotated a bit. What I recall: engine off, put in 5th, loosen tightening nut, and roll gently backwards a bit. if your camchain is that loose you would have broken something by now. Enjoy banner ad-free browsing with Raptor Forum Plus. X2. A forum community dedicated to Yamaha Raptor owners and enthusiasts. The belt has an advantage in cleanliness, but many disadvantages. I'm far too much of a klutz to risk it. May ye be safely in heaven before the devil knows you're dead. Both riders cannot conveniently put a foot down at the same time even if the frame is low enough to allow this. JavaScript is disabled. You can hear the valves open and close through the intake. Stock says .011-.013 but I'd still try to get them as close to the .011 as possible. By I don't particularly care for prying on parts with large screwdrivers. When the timing chain is loose, it can cause the valves to misfire, which can lead to engine damage. We use cookies to improve your experience on this website and so that ads you see online can be tailored to your online browsing interests. Chief among them is that the belt is made in only one length, too short for most stokers to be comfortable.. A chain, on the other hand, can be cut to any length. The clatter could be your chain rubbing against the side of the enclosure if the chain is loose. A Gates belt replaces the synchronizing chain on some newer tandems. JavaScript is disabled. 1988 on Honda 50s don't need to be adjusted. Before you can comprehend the role of the timing chain tensioner, you need to have an understanding of the timing chain. --> This can save you from costly engine repairs down the road. big_perm, The timing chain tensioner is a vital component in the engine that keeps the timing chain tight so that the pistons and valves can operate correctly. ive heard its not. If the timing chain is looser than spec allows (i can hear it hitting the valve cover at 2k rpm), will this cause the engine to run rough? I did mine last night and with the top mark (cam gear) dead on, the crank mark was a little to the left (forward) but still in the sight hole. By properly adjusting the tensioner, you can help to prevent this from happening. If the chain tensioner is not properly adjusted, it can cause the engine to misfire and damage the pistons and valves. Never tighten two neighboring bolts in a row. This will help to prevent damage to the engine. If you are unsure how often you should be adjusting it, consult with a professional or check your owners manual for instructions on when it needs to be done. '73 Spider w/ '74 bumpers and 71(?) If you don't re-set it when you install it, it could be too tight and do damage. That is how freely it should turn when you are done, but with as little chain droop as possible. If you can't explain it simply, you don't understand it well enough. On some tandems, this can cause the riders' feet to collide when the cranks are out of phase. Thank you all for your response. ok so when i adjusted my valves the last time i noticed that the marks on the timing chain cam didnt line up exactly with the mark in the head when i had the motor a TDC. Make sure the engine is cool before adjusting the timing chain tensioner. Having it to tight can cause just as many problems as being to loose. When the timing chain is tight, it will not cause the engine to misfire, which can lead to decreased fuel economy. See also John Allen's article on Tandem Cranksets, and the Tandem Magazine article: Adjusting the Timing Chain. Not an expert but that is what happened on my CT back in the day. Just wondering does the timing chain tensioner adjust itself when I put it in again or does it need to be set before it goes in?? The Fora platform includes forum software by XenForo. When the timing chain is loose, it can cause the engine to skip and damage the pistons and valves. Simple step by step instructions how to. This has been covered many times in these pages - do a search. Buy Sthus 2pcs 12mm Chain Tensioner Adjusters Fit Honda XR CRF 50 70 . CRF50 KLX110, DRZ110, TTR90 CRF50/CRF70 Parts For Sale Chinese/Import Minis - General Discussion Roost Area. This will help ensure that the engine is running correctly and prevent engine damage. This will help to ensure that the job is done correctly. Properly adjusting the chain tensioner will ensure that your engine runs smoothly and without damage. As long as you don't derail the chain and put it on out of its normal phase relation to the sprocket teeth, a considerably worn chain/chainrings can run smoothly and efficiently. This will make it easier to judge how freely the cranks turn. They stretch, just like drive chains. Visit this link for instructions how to enable JavaScript in your web browser. For a better experience, please enable JavaScript in your browser before proceeding. The tape will help stop a slow oil leak. Use a honking big screwdriver to pry the chain follower in the direction that increases tension. Cyclepedia Press LLC | Login | Terms and Conditions. View thousands of photos, event coverage, tips, tricks and performance mods. They are automatic. You may also hear a rattling noise coming from the engine. You need to be a member in order to leave a comment. Tom - 1974 GTV, 1991 Spider (Former: 1963 Giulia Spider, 1987 Milano Gold), wear marks on cover mean that material has been contaminating your oil, One thing you might want to do is turn the exhaust cam anticlockwise to take up any slack on that side then loosen the bolt and with a large screwdriver pry the tensioner sproket out just a little, not much more than what the spring took out. In theory, it makes no difference what size chainwheels you use for the synch chain, as long as they are both the same. Tighten nut securely. When you re-install it it will automatically tension itself up against the timing chain. Now i need to give it gas to keep it going but it's rough and will stall at idle. It should be keeping the chain tight. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[728,90],'sheldonbrown_com-leader-1','ezslot_4',823,'0','0'])};__ez_fad_position('div-gpt-ad-sheldonbrown_com-leader-1-0'); Last Updated: It is important to properly adjust the tensioner regularly to ensure that it is functioning properly. And be careful not to lose any of the small parts. The riders must exercise great care in cornering to avoid striking a pedal. The Precision Tandems site suggests the it should be a bit tighter than that to account for frame flex. Also if you have an oil leak around the 8mm bolt, 13 mm head hex bolt that tightens the block to the head take it out and put some ultragrey permatex on it as some but not all tend to leak from there. Probably made in 1971. Timing Chain Adjustment? This system does have a couple of drawbacks: The ends of the set screws can dent the outer surface of the eccentric, making very fine adjustment a bit difficult. When you buy through links on our site, we may earn an affiliate commission.Copyright ThumperTalk, Inc. - All rights reserved.ThumperTalk is a registered trademark. It adjusts automatically using spring power and a little help from oil and crankcase pressure. do u have 11:1 or somthing to make it so different? The Fora platform includes forum software by XenForo. This will usually require one full chain of the usual length, and most of a second chain. is it safe to take that bolt off? December 24, 2012 in XR/CRF50, XR/CRF70, & CRF110. Mine had grooves worn into it. We use data about you for a number of purposes explained in the links below. If its making a rattling noise, its way overdue for a new T-chain. This is not usually a good idea, however, because the smaller the chainrings, the harder the synch chain pulls (to make up for the fact that it is not moving as fast.) If you use small synch chainrings, you can save a bit of weight, since the smaller rings are lighter, and you can use a slightly shorter chain. - XR/CRF50, XR/CRF70, & CRF110 - ThumperTalk Hi I have a rateling sound coming out of my motor intermittently a couple buddies tell me I need to adjust my timing chain tensioner the bolt buy my oil plug.Do you think thats what my noise is and how do I adjust this Jump to content XR/CRF50, XR/CRF70, & CRF110 Activity I looked again, I see the problem, I'm using standard (inch) feeler gauges so .09-.13mm is the same as .0035-.0051". Honda XR50, CRF50, XR70, CRF70 or thier copies, Chinese made pit bikes, 70cc, 110cc 125cc. This can lead to decreased engine performance and decreased fuel economy. theres something wrong dude, im surprised you havent blown it up! When adjusting the tensioner, make sure to use a proper socket that will fit the bolt snugly. If you try to do this with the normal, short bolt, there may not be enough threads engaged once you have loosened the bolt, and the threads may be damaged by the impact. A forum community dedicated to Alfa Romeo owners and enthusiasts. B. ya i always just reset it and then it "clicks" or self adjusts where it needs to be. Typically the tensioner's spring is not strong enough to push the tensioner out adequately. There are three common mechanisms for adjusting eccentrics, each with advantages and disadvantages. Dec 30, 2007 Stripped my motor down cos i'm putting in a JE 12.5:1. document.write(document.lastModified) A builder, like R&E, can design a new tandem to fit the belt, if the customer so desires, but if you are thinking of retrofitting a tandem with a belt, forget about it unless the spacing between that front and rear bottom brackets is 72.4 to 73.6 cm. Your bike is a K0. (Nobody uses 180 degrees out of phase, it just makes the bike handle weird with no benefit.). The older style Z50R engines have an adjuster that you can tighten to increase chain tension. By continuing to browse our site you agree to our use of data and cookies. It will not work with single-side drive or a kidback. It may not display this or other websites correctly. That's a separate thread also (to keep or not to keep). ", If the cranks are at different angles from one another, they are described as "out of phase" sometimes with an angular measurement. With an even numbered chainring, only the teeth that correspond to the "stretched" half links get deformed, and by doing so, they work fine with the elongated half links. How much tension should the chain have, prior to the tensioner applying its pressure? K0 CT70'S have a AUTO cam chain tensioner, so it doesn't have the stud and locknut. A chain tensioner is a device that is used to keep the timing chain tight. check your timing chain tensioner. One is the tensioner working and two is your chain just too worn out. Idler tensioners are definitely the low-rent way to go, and, if you find yourself choosing between two tandems, one with an eccentric of any type and the other with an idler tensioner, the balance should weigh heavily in favor of the tandem with the eccentric. See more. Some features of this site require JavaScript. The advantage touted for this system is that it smooths out the power curve so that one of the riders is able to exert full force on one of the pedals at all times. The VIN is: CT70282849 and the engine number is: CT70E-282402 if that helps. I understand the process, and I can find the long angled bolt to loosen, but I can not for the life of me find the cam chain tensioner locknut/bolt that is supposed to be located just in front of the shift lever. Top Contributors this Month View All Dr. Frankenstein 19 Replies. It's spring loaded and should adjust itself. Dunno, I lined up the cam and adjusted mine a lot tighter, .004. i think i might have to do an operation again tonight. Before driving a vehicle, it is important to adjust the timing chain tension properly. For a better experience, please enable JavaScript in your browser before proceeding. You need to be a member in order to leave a comment. Thread the bolt well into the wedge, and rap it with a mallet to drive the wedge out. It can only self adjust one way - and that is out, and the spring does that. Adjusting the timing chain tensioner can also help reduce emissions. 1991 Spider Veloce - Red on Tan - Rosa Bionda. turn the cam - both sides are now slack. crf 70 Timing chain adjustment Maknwine Posted December 24, 2012 I don't have the service manual yet, thinking of getting the cd version that's out on fleabay, but can some one list the process. If the chain is loose then you need to check a couple things. Once you have the chainrings centered and secured, adjust the eccentric to make the chain as nearly tight as possible without binding. I read in some links that guys who had similar bikes to mine were adjusting to .004-.007 so I tried it. i lined up the crank and left the cam a little off, and my valves where dead on .011 and .018. right where i left them. Make sure you have the spring out of the tensioner (The 19mm bolt) Compress the tensioner all the way (release the "catch" and push it down), install the chain, install the tensioner - and then reinstall the spring - this will push the tensioner back out to the proper length. Decreased Emissions. Come join the discussion about performance, parts, modifications, troubleshooting, maintenance, and more! The noise could be just the valve overlap. 353 Share 55K views 8 years ago Motorcycle tuning and performance Cam or timing chain adjustment for Honda CRF80, CRF100, XR80, xr100. Tighten up the stack bolts a bit and re-check. We take care of everything. Since it relies on threads cut into the frame, if these threads get damaged, you could be in big trouble. Your bike is a K0. Some eccentrics may not permit this amount of adjustment. So would like to adjust the tension today if someone could spare a few sentences. i didnt adjust my tension at all. To loosen a wedge-type eccentric, remove the bolt (usually a 6 mm thread) that holds the wedge in place, and temporarily replace it with a considerably longer one.
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