cb125 engine swap


Would love some feed back off anyone who may have done this engine change before. The challenge is to find a good lubricant that gives smooth clutch action without dragging or slipping. e-mail: 3Re-cut both valve pockets.

This makes the piston travel further down in the cylinder (this is where you get the increased displacement). It is caused bu clutch plates (both friction and metal) wearing extremely smooth, so the oil in between them is squeezed to a very thin film and acting almost like glue. My recommendation is to set the static ignition timing correctly and scrape a mark on the ignition points back plate. Telephone: +01425 616 446 The Thumper Page has instructions on how to subscribe etc.

-Shrink the stock rod assembly TL125 (K)1973Frame TL125-1000003 onwardsEngine TL125E-1000001 onwards56.0mm x 49.5mm122cc My first tries were with "traditional" high quality engine oils, such as Mobil 1 and Castrol Syntec. Al Johnstone: Big bore kits (150cc), head flowing, various vintage and modern trials parts and accessories, almost any part, accessory or work you would need for the TL (new, aftermarket and used parts, fork reconditioning etc. JavaScript is disabled. The piston in my TL is 65.5mm, making the displacement about 167cc. If you decide to do plate work do it so that the plates are not warped!

If you experience any difficulties in stalling the bike in slow speed sections you may want to try retarding the ignition. Proper caution must be excercised if trying to attempt cam/piston swaps for increased displacement. I have read through some old posts here and learned a lot about what can and cant be done to the 125 for power upgrades, and the differences in ports etc of the split heads vs. one piece.

135cc Bore Kit - Bores into stock liner

Is it the same engine The challenge is to find a good lubricant that gives smooth clutch action without dragging or slipping. I have one of these bikes, mostly standard. B&J Racing also makes custom control cables and custom foam air filters. On the TL125 site there is a picture of my cracked standard barrel bored to take a 750 piston. 1.) Jarmo Kaila: Easiest improvement is raising the fork tubes up in the triple clamps.

The stroker also makes it easier for the crank to "push" the piston through it's stroke, making it easier to generate torque.
Fax: +44 1728 832197 Salam to all PW. I have a donor CB125 engine I want to build up and put in my CB100.

Differencies between bikes are mostly attributed to different metal plate materials, although there is anecdotal evidence of different types of oil causing more or less sticking. Since we shrink the rod - everything goes back together just like stock parts. In the latter the cylinder head breaks horizontally into two, camshaft in between. The later 2-piece heads don't swap because one of the changes implemented at that time was moving the points and advancer from the end of the cam to down on the end of the crank. Don't use silicone sealant on the top end rebuild. All cast-ins can be repaired with CB350 and/or CB750 liner. in tighter turns the bike wants to increase the steering angle and one has to hold back against the bars. Lots of parts, spares and accessories. There were also a number of cosmetic changes, such as silver frame, black hubs etc. have non-desired effect on the engine performance . Mark Worsfold, http://www.freeyellow.com/members/batwings/best.html. It was made for a few (3?) Bob Ginder [email protected] These have cast-in liners, are heavier construction and have more fin area. Basically, what we do on a stroker is this: 5.) Web-page: http://www.davidsilverspares.co.uk/, Powroll Inc Differencies between bikes are mostly attributed to different metal plate materials, although there is anecdotal evidence of different types of oil causing more or less sticking. Note that pumper carbs are not allowed in the AHRMA "modern classics" class (although I think they should be). document.write('Jarmo Kaila') Jarmo Kaila: 2) How do I identify TLs? The nut is torqued pretty tight and it won't come out with needle nose pliers without ruining the pliers and damaging the nut (don't ask). 2.) Valves are compatible between styles and those from bigger motors may be used for oversizes for smaller. The worst weakness must be the infamous 4-stroke off-idle cough and hesitation.

These have cast-in liners, are heavier construction and have more fin area. The piston in my TL is 65.5mm, making the displacement about 167cc.

I know that not everyboby agrees with this, the implication being that the old liner will suffice. Other things - hardweld mid to top end cam - we regrind your stock cam, oversize header with supertrapp - down pipe, heavy duty valve springs - recommended for race engines using our cam.

For more information see their homepage at http://www.mcreports.com/.

Telephone: +1-562-490 0012 These should be used with a sealer such as Coppercoat gasket paint. Above combos may be used with 100cc motors; all except 134cc need case boring, all need re-lining and/or bigger jug, and all need small rod end bored for the listed pistons. tubes sticking up from the top triple clamp) just 10mm to 20mm (1/2" to 3/4") makes a difference and doesn't reduce ground clearance to any noticeable effect.

Cases must be bored. Bob Ginder: Varies a lot, but I have seen decent examples for about US$800-1200. -Move the crank pin location outward on the flyweights (using an offset

The camshaft bearing surfaces are machined directly on the cylinder head without any sleeves. TY forks are slightly shorter than TL, so they had the same effect as raising TL forks in the clamps. Generally, rebalancing crankshafts is not necessary to use these bits with the TL, as revs are usually not excessively high, but cranks can be re-done if desired for smoother running with the bigger bores. Best Motorcycle Repair //-->Javascript required for contact e-mail address to show I've received a lot of e-mails about modifications people used to do to TL's, seems that in the mid to late 70's a lot of people tinkered with the TL. On my big bore bike I'm running at almost exactly the half way point.

The original TL tuner.

Address: 4211 SW Mountain Pkwy, P.O.Box 920, Redmond, OR 97756 in tighter turns the bike wants to increase the steering angle and one has to hold back against the bars.

[email protected] WOT from off-idle), especially if the fuel is not fresh. 9No factory overbores available.

a short run-down of what we have for the early style (one piece head) 125's:

Motion Pro also makes this tool as their part #08-015. For more suppliers see the TL125 Parts Page at the Honda TL125 Home Page. TL has a little spring that can be used to "lock" the left footpeg to "up" position, however in most bikes I've seen this spring is lost or broken.

Comparing the TL engine to other older small Honda thumpers the cases, ignition and crank (heavier on the TL) are different. Due to the 4-stroke engine of the TL you can't experiment with the engine oil as freely as with a "normal" 2-stroke bike. You may use shortened 185-200 cylinder blocks with 125 heads and cases, and use shortened camchain to put the bigger heads on modified 125 cylinders. May use CB750 liner if cases bored. Also, occasionally remove the clutch cover and clean the oil slinger. //-->Javascript required for contact e-mail address to show This is untrue, it will fail. e-mail: [email protected] web-page: The TL125 was re-introduced in the '80s in Japan as model "Ihatovo". This is untrue, it will fail.

Telephone: +1-615-789 5956 It was an older thread of yours where I learned about a 125 build up.

Entire 185/200 top end swap-ons require case machining only, plus longer camchain tunnel head-bolt. Performance stroker cranks, big bore kits, head porting. If you warp a steel friction plate it is almost impossible to get it straight again. Jarmo Kaila:

I know that not everyboby agrees with this, the implication being that the old liner will suffice.

(Thanks for TL owner Sinzi "Sin" Okayasu for this info). We can also do any machine shop services, plus performance head work (porting, oversize stainless-steel intake valves, etc). I used to do this with coarse sandpaper, the effect would last for a few months of very active riding. So although TL125 is quite easy to start it is probably a good idea to remove the spring from the right hand footpeg. Set the ignition between these points and start experimenting, changing the timing little bit at a time until you are satisfied. bushing) 2.) Those for smaller motors will need spigot opening enlarged for some big-bores, or suitable gaskets from bigger motors can be used.

The main changes were that front forks were changed to semi-air assisted type and rear shocks used were different (up-side down).

For more info see the Story of the Big Bore TL. Sometimes it is claimed that a 122cc barrel wont do but a 124cc barrel will. Set the ignition between these points and start experimenting, changing the timing little bit at a time until you are satisfied. TL125 K11974Frame TL125-1100001 onwardsEngine TL125E-1100001 onwards56.0mm x 49.5mm122cc -Reassemble the whole thing Jarmo Kaila: e-mail: [email protected]

The later 2-piece heads don't swap because one of the changes implemented at that time was moving the points and …

However, it does not appear to have run for long as the piston is relatively unscuffed. how do you rate the zongshen engine? All of these small (100 and 125 cc) Honda engines are pretty much the same. that was used in the CB/CL/CT/SL/XL? I realized long ago I wasn't going to hold the displacement record for this motor, as I liked to finish races. For more discussion on this issue see item 7. The main changes were that front forks were changed to semi-air assisted type and rear shocks used were different (up-side down).
the US or elsewhere that sell hop-ups, additions, etc? The cam bearings in the TL motor are goosed, but the CB seems fine. i'm looking at putting a 200cc (with balancing shaft) in my 125. However, it does not appear to have run for long as the piston is relatively unscuffed. Big bore kits (150cc), head flowing, various vintage and modern trials parts and accessories, almost any part, accessory or work you would need for the TL (new, aftermarket and used parts, fork reconditioning etc. David Silver Spares May use CB750 liner if cases bored. For more info see the Story of the Big Bore TL. Original Honda units are 14 1/2" long (370mm), I have swapped them for 15 1/4" (390mm) Works Shocks units from B&J Racing. e-mail: [email protected]

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