Re: My Rx100 restoration

Restoration Thread Approved

Re: My Rx100 restoration

Thank you sir. I need other advice as well and some help with parts. like I needed a 86 OEM coil cover in used parts If that can be sourced. my mechanic you see was a crook, he stole it and said it broke. if I had not intervened on time god knows what else he would have stolen. also I need someone who can guide me through porting of the cylinder as I have a spare now which I am re-boring to first oversize. also can you tell me which series cylinder kits to avoid like my current one says I-2.

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Thank you for the approval sir..........

Re: My Rx100 restoration

If you want to convert 4 speed to 5 speed just the gear box on the RX100, all you will need to do is search for the RX135 5 speed gear box and plonk. No other changes required.

I wouldn't really recommend to change your RX100 '86 model to RX135 5 speed (as how we got from the showroom), however, for your knowledge sake, here you go..

The following changes involved converting to RX135 5 speed are as follows:-

1. Cylinder assembly - 4TL10 (This is 5 speed producing 14bhp where as 4TL00 produces 12bhp-4 speed variant)
2. Head assemby - (09L or 4TL10 etched on the inside). The 5 speed came with this head for higher compression.
3. Gearbox - 5 speed where as the last two gear cogs has 24 and 22 teeths.
4. Carburetor - 4TL4 20 (etched on the carb near 2t inlet) and it is sligthly different than RX135 4 speed carb as this has a oval venturi.
5. Chain sprocket - RX135 5 speed came with front 15 and rear 38 sprocketing.
6. Catalytic convertor (Catcon) muffler - this was the answer from Yamaha for emission compliance. However, many have resorted to Chrome muffler(pipe) like the RX100 to much please the ears.

Hope this helps.

Re: My Rx100 restoration

Thank you SriramEfunds........ but I just wanted to convert my RX100 to five speed i.e into an "RX100 5speed" not a 135 5speed. growing up me and my dad bonded a lot over his motorcycle his trusty RX100 and I remember him telling me that it had the space for a 5th gear. the bike in question has been in use for 28 years so I just wanted to see if what my dad said could actually happen. so my question is what if I got just the shifter setup and the extra 5th cog from a 135 five speed would that work? or can I transplant the whole gearbox of the 135 without getting the cylinder kit to match.

Oh and by the way. its just my opinion yours could differ but.............. If biking is a religion then the Catcon tail pipes on two strokes are BLASPHAMY!!!............... but again that's my opinion.
will post some pre resto pics soon..............

will post some pre restoration pics soon

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I tried to contact [MENTION=19778]Bibhu[/MENTION] as per your sugggestion but it seem he has not been online in a while atleast that is the idea I got from visiting his page. but I still left him a message and will wait for a reply

Re: My Rx100 restoration

You'll need to change complete gear box because there is a difference in the gear drum and the fifth cog would need the match pinion gear. Just inserting a cog won't do the trick. If may I ask you why you want to have 5th gear. If you look at the gear ratio. It won't matter much,in fact in 4 speed gear box, the 3rd gear has 26 and 4th has 23 which is a good overdrive compared to 5speed gear box where 4th gear cog is 24 and 5th cog will be 22. Again its just ones wish how and what he needs.

Re: My Rx100 restoration

Hi Sriram, couldn't understand here. Can you please throw some light?
In my understanding 5S has the least final drive ratio (0.917) compared to 4S (1.000)

Re: My Rx100 restoration

What I tried to convey is, I'm able to enjoy the overdrive much better in 4 speed due to tall gearing(1.000). Whereas in 5 speed it is slight short ie 4th cog runs 24/22 teeth and 5th 22/24 teeth doesn't give much room to enjoy the overdrive is my pure experience. Offcourse I'm not bringing in the speed or acceleration nor powerband here. I noticed the drop in RPM in the 4 speed while shifting to the 4th gear greater than 5 speed's 5th gear. Also, the 4 speed secondary reduction ratio's influence is noticeable due to tall sprocketing. If both your RX are 4 and 5 speeds then its worth a try to take a spin to realize the difference.

Re: My Rx100 restoration

as I explained earlier I just wanted to try out a theory, an idea that my dad put in my head when I was little and used to think the rx 100 is a gigantic bike (I must have been a little over a foot tall then). so you see it is just a matter of trying it out. as far as enjoying the ride is concerned the RX100 was my first bike officially passed down to me by my dad in 2003............I've enjoyed the ride enough. now I just want a smooth and quick ride and have therefore bought a KTM 390 to that effect.

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what I absolutely need now is someone who can make me understand the porting of two stroke cylinders (specifically the RX100 bore). I recently changed the cylinder kit of my bike and the old one is still with me. and fortunately my dad bought and ran only standard cylinders kits on his bike (he didn't like over sizing said it messed with the mileage, plus he liked to keep the bike stock.). what this means is that I have a used standard cylinder to port and oversize to 1st OS.

any input from any members experienced in this area is appreciated.................. Thanx guys

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meanwhile here is another 2 stroke a Pearl Yamaha MG2 that I own also originally my dad's


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mobile cam bear with me.

this bike was recently brought to life from a scrap heap by a magician of a mechanic by the name of Shri Krishna Kumar. he runs a garage in clock tower secunderabad telangana by the name of hamakita motors. he is an old friend of my dad's and owns one of these bikes himself. he is amazing and knowledgeable and the only one I know who constructs unavailable spares himself. he cut and pressed the clutch plates and molded and tempered the missing shifter shaft himself along with other small missing parts.

Re: My Rx100 restoration

Hi there, Thanks for sharing the mechanics details as well. Could you PM me his cell number. I need to get a experts opinion about my samurais Engine condition and what needs to be taken care of on priority.

Re: My Rx100 restoration

Hey guys,

Here are some pre resto pics of my bike. once again sorry for the pic quality, cell phone cam so bear with me


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Hey Srikany,

so the name of the mechanic is Shri Krishna Kumar and his number is 9290750088.
he is available anytime after 11am and upto 6pm. his charges are reasonable and you'll be happy to know his oldest son who runs the shop also owns a samurai

Re: My Rx100 restoration

what's this my restoration thread has gone cold turkey. all I did was ask for help and it seems every 2 stroker and all senior BHPians have vanished. come on guys I really need help.

I know this RX100 may not be as exciting to all of you as a RD350 or a rajdoot or jawa and any other exotic but it means a lot to me. I grew up on this bike, me and my Dad bonded over this bike, its not only my first ride but also the very first motorcycle that I laid my eyes on and I want to see her returned to her former glory.

My Dad says the bike has aged with him and now it is obsolete and it should be retired (he said this with an air of sadness and disappointment). I just want to bring her youth back and show my Dad that it has many more years to go.

So please help me.

Re: My Rx100 restoration

Looking for info on porting the cylinder? Google. You have loads of information on two stroke as how it is done. Also, if you don't mind spending your precious time flipping threads backwards in this section, might find answer.
If I quoted your want incorrect, then just put a line what you want to do with your RX100.

Re: My Rx100 restoration

yeah I googled after I posted and found some stuff will work with it. do you know anyone who has an original made in japan coil cover for the rx 100. its the one that has the clutch wire going in. my mechanic replaced it with some shitty new one of low quality. anyone who has a used one or new old stock will help.

also the point of me asking for help was details. I routed through most of this forum and no one seemed to have given details of how they are procuring parts and from where.

also I asked a question initially in this forum about the various series of RX cylinder kits( Y-1, I-2, etc) available and which ones to look at and which to avoid but I got no reply. the threads here are vague on that too. it would mean a lot to me if you could help in this area.
Thanx
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an update
Got the chassis sorted out. turns out it was bent at the swing arm and rear from my accident in 2005. so on to the next........................

Re: My Rx100 restoration

Hope You Are Have a nice time restoring your RX..! If you want some nostalgia remaining.. you must stop modifying it.! As with the cylinder kits,the only thing i know is that the Japanese ones from the late 1985 to 1987 came with Y1,Y2 bores .from then onwards naming changed with G1,G2,G3,G4 All Made in India.! AFAIK in the case of the 135 people rarely pick bores of I3,I4. Still dont know the exact reason of this. so better stick with lower numbers (1,2) to go with the crowd hope that helps.