Looking to finish the rebuild on my 175cc Bultaco Sherpa T and need some new piston rings. The piston is a MAHLE and is 60.8 in diameter. Measuring the bore a 61mm ring should work but I am struggling to find a UK outlet for such a thing. I have tried the usual In Motion and other specialists but they have nothing listed.
Also as it has been a while since the strip down could anyone please remind me the correct orientation of the piston. From memory the longer skirt on the piston goes to the inlet side but any confirmation would be appreciated.
Thanks in advance for any help.
Pick up the phone and speak to Dave Renham, if he doesnt have them at in motion im sure he can either source or point you to a genuine ring.
For this sort of thing the way I approach it is to not have anything dodgy in case you get pulled over - this is far more likely if you're playing about on green lanes (or riding on the road to a practice spot) than attending an event where there's lots of other riders about.
I was stopped several times when I was still in the UK by police who were following up on reports of "hooligans on motocross bikes", when the police saw that I was 100% legit I didn't get any trouble - if one of them was having a bad day and saw my bike wasn't legal then I would have had a bad day.
for these cicumstances i would probably do the same.
It's poor attitudes / manners like the op that is slowly killing trials central. Why bother to give them hard earned advice when they haven't the sense to accept it gracefully.
That was my point, as much as anything we have all done the kick kick kick, but if experience has shown me anything when breaking down is to deal with one issue at a time.
Most of us would know that a flooded trials bike hasnt got a damaged cdi etc etc, at least not until everything obvious has been eliminated. Ive drowned my bikes maybe 5 or 6 times and each time I have got the bike upside down and plug out quicker than before.
Lastly whilst I always listen respectfully and carefully I wont always agree, and everyone has to live by there decisions. Pound to a pinch had the OP taken a few tools and sorted the initial issue im guessing he would have got his bike running sweet enough.
Excuse me, but what does the fact of being Europeans have to do with a motorcycle talk? I have always thought about two-wheeled passion but you can see that this is not the case for everyone 👋👋
@Dannydangles My advice is what it is take it or leave it I really couldnt care less either way, but as you clearly havent a clue to critisise my trials experience based on riding events etc for 50 years as fatherlym, seems somewhat churlish. Certainly when I was starting out right up to last weekend I'm more than happy to accept any opinion/view/advice/experience from anyone in our community.
Buying a new one is out of question, looked at 4rt as my mate has one and they are so easy to start, will try the tip of getting it TDC Cheers everyone 👍
Up until mid 1990's, most Trials bikes came with a speedo (on fork leg) and if you look back on older pics of SSDT, all TY Mono's and TYZ's sported their speedo's
I dont need to look back, I couldve patented the pnuematic Bultaco speedo on my 340 in 82. Instead of a drive cable i had a hose connected to a lump of aluminium on the front brake plate. Ran on fresh air but absolutely looked the part.
So should all trials bikes used on the road have them?
Unfortunately I wasn’t prepared to do this work in the bush and I was more than a few km from the truck and pushing it out wasn’t an option.I went though the carb as I noticed signs of water entering the air box, dried air box and expected it to fire up as I was able to get it running enough to flee the bugs and the Bush. When it didn’t start as per normal I began troubleshooting the lack of spark.
Sorry yes I did remove the ignition cover and found a small amount of condensation, dried and cleaned but still no change.
If you dont want to walk you would need only a very few tools to facilitate sorting a drowned bike, or any other minor mishaps. I dont go out on a competion trial loop without basic tools let alone where I was considering an unknown depth water crossing "in the bush". Each to there own.......
tearing the whole thing apart wont help problem solving. For next time when you drown a bike (trials) carb off remove all water dont forget banjo if its a dellorto, dry out airbox and especially filter, tip upside down with plug out, as above, all back together check for spark and fire her up.
Get it lovely and hot to disapate any water remaining. (20 mins?) kicking over for 30 was probably not that helpful.
There seems no mention above of taking ignition cover off im assuming you did that first?
It was in really bad shape the operation was about 4 hours as there were several things wrong.
Its better than it has been for 15 years, and so much so once completely healed about 8 months later the left one felt suspect!
It wasnt cheap but at the time i was insured. Big benefit to elect when, but in my case i had to have it done asap which was a few weeks later.
My only warning would be it hurt so much after i was on morphine for 3/4 days. It was done with a nerve block bit like an epidural which lasted 18 hours, after that i was close to buying fentynyl off the street.
I emailed the dealer Monday at midday (by then I was already back home thanks to the bike not running) and having not heard, called him yesterday.
Based on our call it was all very civil and he's agreed a refund. Possibly they knew there was an issue, possibly they're just being responsible dealers.
We're going to speak again Monday to confirm the return but assuming it goes ahead as described I'll let everyone know who they are, and give them 5 stars on Google.
I'm disappointed but they have a business to run and I completely understand this is costing them money.
I can reccomend a dealer in Yorkshire who can let you try a few bikes BEFORE you buy?
My boy had a 2012 250 with the delorto rear tank model. IT had less than 10 hours on the bike from a novice rider. Like new. It was a dog , I had a kiehin so ordered a manifold for thw bgger carb. The vacuum i take was a joke. It just would no pull any fuel. That 2012 the frame was like spagehtti. The head stay from frame to engine, we would lose that bolt no matter what, I finally double nutted it and red loctite. Any how that vacuum system is someting to run from. I could go on but this post would be deleted.
Why would any post on specific issues youve had be deleted?
There's surely been plenty of discussion around that already on the Jgas thread as a whole? Including stories that parts weren't available which I've personally found out to be untrue before I posted on here; plus you can even order direct from the factory.
Their lack of communication problem is of their own making though.
Any one who gives Jotagas any money direct is a fool, imho. The british importer at the time before haven went to the factory himself to collect bikes, got the bikes loaded and then paid for them.
That says alot. Even going back that far one batch had no shock absorbers on (hadnt paid suppliers) so I would be very very careful.
TRRS and Vertigo look super nice, but I can pick up the 2020 Gasser for $3k less and a 2021 for $2k less.
Thanks for the feedback! Seems the consensus is that there is very little difference in the 2020 to 2021 model year. I grabbed a good deal on the 2020 TXT250 and saved myself a little cash for some bling.
Piston Rings
in Bultaco
Posted · Edited by nigel dabster
Pick up the phone and speak to Dave Renham, if he doesnt have them at in motion im sure he can either source or point you to a genuine ring.